10 months agoMan Utd boss Solskjaer compares Rashford to Juventus star Ronaldo


first_imgMan Utd boss Solskjaer compares Rashford to Juventus star Ronaldoby Freddie Taylor10 months agoSend to a friendShare the loveManchester United manager Ole Gunnar Solskjaer has compared Marcus Rashford to Cristiano Ronaldo due to his swerving free-kicks.Rashford has often cited the Juventus superstar as a player he’s tried to emulate in his career.And after scoring United’s second from a set-piece in last night’s 2-0 win over Newcastle, Solskjaer had high praise for the 21-year-old.Speaking after the game, Solskjaer told BBC Sport: “Marcus Rashford has the Cristiano hit, it swerves everywhere, but I liked his goal today. Calmed himself down, just passed it in. Well done.”He is only 21, you have to remember that.” About the authorFreddie TaylorShare the loveHave your saylast_img read more

9 months agoInter Milan director Ausilio: Palmeiras wanted to sell us Gabriel Jesus


first_imgInter Milan director Ausilio: Palmeiras wanted to sell us Gabriel Jesusby Carlos Volcano9 months agoSend to a friendShare the loveInter Milan sporting director Piero Ausilio admits they came close to signing Manchester City attacker Gabriel Jesus.Ausilio says Palmeiras were willing to sell them the Brazil international.“We were negotiating with Gabriel Jesus for a month,” Ausilio told Sky Sport Italia.“Our offer was also better than Manchester City’s. Palmeiras preferred to sell him to us but the lad, through his agents, let us know that he preferred to play for Guardiola.” TagsTransfersAbout the authorCarlos VolcanoShare the loveHave your saylast_img read more

Russia accused of targeting chemical weapons watchdog


first_imgBRUSSELS – The Dutch defence minister on Thursday accused Russia’s military intelligence unit of attempted cybercrimes targeting the international chemical weapons watchdog and the investigation into the 2014 Malaysian Airlines crash over Ukraine.The Dutch allegations came as British officials blamed Russia’s GRU for allegedly “brazen” activities worldwide the globe and for trying to cover up its alleged participation in the nerve agent poisoning of an ex-spy and the downing of a Malaysia Airlines plane over Ukraine. MH17. Russia has consistently denied involvement in the events.Dutch Defence Minister Ank Bijleveld said that the GRU’s alleged hacking attempts on the Organization for the Prohibition of Chemical Weapons took place in April and were disrupted by authorities. Four Russian intelligence officers were immediately expelled from the Netherlands, she said.Speaking about Russia’s hacking attempts into the MH17 crash investigation, she said: “We have been aware of the interest of Russian intelligence services in this investigation and have taken appropriate measures.”“We remain very alert about this,” she said.Britain’s ambassador to the Netherlands, Peter Wilson, said the GRU would no longer be allowed to act with impunity. Britain blames the secretive military intelligence unit for the nerve agent attack in March on former Russian spy Sergei Skripal and his daughter, Yulia, in the English city of Salisbury.He said Russia’s actions against the Netherlands-based OPCW came as the agency was conducting an independent analysis of the nerve agent used against the Skripals.Russian Foreign Ministry spokeswoman Maria Zakharova dismissed the new accusations Thursday, calling them “big fantasies.”Earlier, British Defence Secretary Gavin Williamson branded a series of global cyberattacks blamed on Russia as the reckless actions of a “pariah state,” saying that the U.K. and its NATO allies would uncover such activities in the future.“Where Russia acts in an indiscriminate and reckless way, where they have done in terms of these cyberattacks, we will be exposing them,” Williamson told reporters in Brussels at talks with U.S. Defence Secretary Jim Mattis and their NATO counterparts.His remarks came after British and Australian officials said the Russian military intelligence unit GRU is behind a wave of global cybercrimes. Britain’s National Cyber Security Center says four new attacks are associated with the GRU as well as earlier cyberattacks.It cites attacks on the World Anti-Doping Agency, Ukrainian transport systems, the 2016 U.S. presidential race and others as very likely the work of the GRU.“We are not going to be backward leaning. We are going to actually make it clear that where Russia acts, we are going to be exposing that action,” Williamson said.“This is not the actions of a great power. This is the actions of a pariah state, and we will continue working with allies to isolate them; make them understand they cannot continue to conduct themselves in such a way,” he said.Earlier, Australian Prime Minister Scott Morrison and Foreign Minister Marise Payne issued a joint statement that Australian intelligence agencies agreed that GRU “is responsible for this pattern of malicious cyber activity.” They said Australia wasn’t significantly impacted, but the cyberattacks caused economic damage and disrupted civilian infrastructure in other places.___This story has been corrected to show the chemical weapons watchdog is an international, not United Nations agency.__Gregory Katz in London and Raf Casert in Brussels contributed to this report.last_img read more

Lowes to close 31 locations across Canada


first_imgHome improvement retail giant Lowe’s has announced it will close 31 locations — mostly under the Rona banner — in Canada.In a release, the company said the stores being closed are under-performing.“While decisions that impact our associates are never easy, the store closures are a necessary step in our strategic reassessment as we focus on building a stronger business,” Marvin R. Ellison, Lowe’s president and CEO, said in a statement.“We believe our people are the foundation of our business and essential to our future growth, and we are making every effort to transition impacted associates to nearby Lowe’s stores.”Three stores in the GTA have been marked for closure: two Rona locations in Mississauga and the Lowe’s at Centrepoint Mall.In total, there are 31 sites that are closing: two regional support centers, a truss plant, a block plant and 27 stores. Within those 27 stores there are 24 RONA stores, 1 Reno-Depot store and two Lowe’s locations.Lowe’s said is expects to close the impacted stores by the end of the company’s 2018 fiscal year — Feb. 1, 2019.There has been no word on how many jobs will be lost due to these closures.In addition to the 31 Canadian locations, Lowe’s is also planning to close 20 locations in the United States.It was just over a year ago that Lowe’s bought fellow Canadian home improvement retailer Rona.For a complete list of locations in the U.S. and Canada that will be closing, click here.The story above was updated to reflect incorrect information related to the Canadian closures.last_img read more

Legislation introduced to limit pain and suffering payouts on minor injury claims


first_imgA limit on pain and suffering damages for minor injuries will allow ICBC to redirect resources to increasing benefits for lost pay and medical rehabilitation for all people injured in accidents. A limit of $5,500 on pain and suffering payouts for minor injury claims would also go into effect on April 1st, 2019. The bill defines a minor injury as one “that does not result in a serious impairment or a permanent serious disfigurement” and is not resolved in 12 months. It gives the government broad power to define specific minor injuries in the future.  Injury costs in B.C. increased 80 percent between 2009 and 2016, from from $1.5 billion to $2.7 billion.“Today’s legislation is about doing what’s best for B.C. drivers – both in what they pay for insurance and in making sure they get the best coverage if they’re injured,” said Eby. “For years, B.C. drivers have had to pay more and more simply to cover the spiralling legal and administrative costs at ICBC. We can’t right the past – but we can put ICBC back on track to deliver more affordable rates and better coverage for drivers moving forward.”“It is unacceptable, not just that British Columbians faced skyrocketing rates while ICBC lost hundreds of millions of dollars, but also that benefits for injured drivers, passengers, cyclists and pedestrians have been frozen in time for a quarter century. We are rebalancing where ICBC premium dollars go. We’re shifting the money out of administration, expert reports and court processes, and into driver’s pockets through stable rates and better benefits.” VICTORIA, B.C. — Attorney General David Eby says that the provincial government has introduced legislation to try to restore the finances of ICBC, which he referred to in January as a “financial dumpster fire.”If they’re approved by the legislature, the amendments to the Insurance Act and the Civil Resolution Tribunal Act will simplify dispute resolution processes for cases under $50,000, allowing them to be resolved in as little as 90 days. Those cases are currently lasting two to three years in B.C. Supreme Court.The government said that legal fees and expenses have grown to 24 percent of ICBC’s total annual costs.last_img read more

SC demolishes Modi Jaitley BJPs stand on electoral bonds Yechury


first_imgNew Delhi: Welcoming the Supreme Court’s decision on electoral bonds, CPI(M) General Secretary Sitaram Yechury Friday said the apex court had “demolished” the stand taken by the BJP-led NDA government on the issue. The Supreme Court Friday did not stop political funding through electoral bonds but brought several checks on it to bring transparency by directing all political parties to furnish receipts of amounts received and details of identity of donors in a sealed cover to the Election Commission. Also Read – Uddhav bats for ‘Sena CM’ In an interim order, the apex court also directed all political parties to provide details of the amount of the bond and bank account of donors by May 30 to the poll panel. “Supreme Court demolishes stance taken by Modi, Jaitley & BJP – which had pushed this as a Money bill, for opaque, secret Electoral bonds. The court says transparency is the basic principle of electoral funding. People have a right to know which party got how much, and from whom,” Yechury tweeted. Also Read – Farooq demands unconditional release of all detainees in J&K The Centre and the Election Commission had taken contrary stands in the Supreme Court on Wednesday over political funding, with the government wanting to maintain anonymity of donors of electoral bonds and the poll panel batting for revealing names of donors for transparency. “Anonymity pushed by BJP is on the way out. Donors of black money via this route will be scared to fund from here on. Today EC has the data. Tomorrow the public will also have it,” Yechury wrote on Twitter.last_img read more

Notorious Moroccan Hacker Arrested in Thailand


first_imgRabat – Farid Essebar, a notorious Moroccan-Russian hacker wanted by the authorities in Switzerland, was arrested on Tuesday by Thailand’s Department of Special Investigation (DSI) in Bangkok.  He is accused of cracking Switzerland Bank’s computers and websites.Farid Essebar, who has dual Moroccan-Russian nationality, was detained in Bangkok last week by officials from the Department of Special Investigation (DSI), according to the Bangkok Post news website.  Police Colonel Songsak Raksaksakul, chief of the International Cases and International Crime Division, said that authorities had arrested the suspect at a condominium on Rama IV Road.“Thailand will send him to Switzerland within 90 days in accordance with the extradition agreement” between Switzerland and Thailand,’’ he added. The 27-year-old Moroccan-Russian citizen was arrested on suspicion of taking part in a cyber crime which involved cracking banking systems and hacking into online banking websites.  The breach was reported to have resulted in $4 billion worth of damage to customers in Europe in 2011.Police are reportedly searching for two other gang members involved in the breach.In an interview with the Bangkok Post, the DSI official said that Swiss police had alerted Thai authorities “to their hunt for the hacker through their embassy in Bangkok after receiving information that he and three other gang members had come to Thailand.”“DSI officials and police tracked Essebar for about two years until they were certain that he was the one on the wanted list by Switzerland,” he added.This is not the first time Essebar was arrested. In 2006, he was sentenced to two years in prison for spreading the Zotob computer worm that targeted Windows 2000 operating systems in 2005. Among the affected were CNN, ABC News, the New York Times, Caterpillar, United Parcel Service, Boeing and also the United States Department of Homeland Security.Edited by Elisabeth Myers© Morocco World News. All Rights Reserved. This material may not be published, rewritten or redistributedlast_img read more

New Sex Offender Added To Wilmingtons Sex Offender Registry


first_img**FOR INFORMATIONAL PURPOSES ONLY. PLEASE READ DISCLAIMER AT BOTTOM.**WILMINGTON, MA — Last week, the Wilmington Police Department added a new offender to its Sex Offender Registry.Walter H. MacDougall was convicted on two counts of open and gross lewdness and lascivious behavior — once in March 2004 and once in January 2017.Readers may remember that MacDougall was arrested back in March 2016 for exposing himself to an 8-year-old girl at the Wilmington Market Basket.He is classified as a Level 2 Sex Offender. “Level 2” indicates a moderate risk of re-offending and a moderate degree of danger to the public.MacDougall lives Wilmington at 36 Salem Street. He is a 73-year-old white male. He’s 5’10″, 195 lbs, with partially gray hair and blue eyes.View MacDougall’s offender flyer HERE.Walter H. MacDougall(DISCLAIMER: Sex offender registration information shall not be used to commit a crime against an offender or engage in illegal discrimination or harassment of an offender. Any person who uses sex offender registration information for such purpose shall be punished by not more than two and one-half (2 ½) years in a house of correction or by fine of not more than $1000.00 or both. M.G.L. c. 6, § 178N. Any person who uses sex offender registration information to threaten to commit a crime may be punished by a fine of not more than $100.00 or by imprisonment for not more than six months. M.G.L. c. 275, § 4.)Like Wilmington Apple on Facebook. Follow Wilmington Apple on Twitter.  Subscribe to Wilmington Apple’s daily email newsletter HERE.  Got a comment, question, photo, press release, or news tip? Email wilmingtonapple@gmail.com.Share this:TwitterFacebookLike this:Like Loading… RelatedNew Sex Offender Added To Wilmington’s Sex Offender RegistryIn “Police Log”New Sex Offender Added To Wilmington’s Sex Offender RegistryIn “Government”State Police Add 5 Fugitives To Most Wanted Sex Offenders ListIn “Government”last_img read more

Dating app 3Fun had users data location and pictures exposed report says


first_img Now playing: Watch this: 3:59 Dating app 3Fun’s lax security measures reportedly made it easy to find its 1.5 million users’ personal data.  Screenshot Dating app 3Fun, which describes itself as an app designed “for meeting local kinky, open-minded people for 3some & swinger lifestyle” and claims over 1.5 million users, appears to have been open to more than just relationships. In a new post from security firm Pen Test Partners this week, it also apparently exposed sensitive user data including the “near real time location” of its members, their photos and information including birthdates, sexual preferences and chats. In short, the firm called the app a “privacy train wreck,” adding “how many relationships or careers could be ended through this data being exposed?”Available on iOS and Android, the app’s Google Play page lists it as having over 100,000 installs. Best dating apps of 2019 According to Pen Test’s findings, which were shared and verified by TechCrunch, getting some of the data was as simple as spoofing a GPS location in the app, which then pulled up information of users nearby. The results included finding members located in the Supreme Court and the White House, though the exact information on those users wasn’t revealed, and the report notes it’s possible somebody was spoofing their own location to appear as if they were in those government buildings. Pen Test says it reached out to 3Fun on July 1 to let them know about the holes, writing that the company responded “Thanks for your kindly reminding. We will fix the problems as soon as possible. Do you have any suggestion? Regards, The 3Fun Team.”The research firm says they did make some suggestions and that 3Fun “took action fairly quickly and resolved the problem.” In a statement, the company acknowledged the issues and says it will work to make its app safer going forward. “We sincerely apologize about the vulnerability. We took the action immediately,” the company told CNET. “Security updates to 3Fun’s API, servers and mobile application were made on July 2nd and a new, more secure version of the app was released on July 8th. We will focus on updating our product to make it safer.”Originally published August 9 at 10:08 a.m. PT. Updated August 12 at 8:00 a.m. PT: Added 3Fun comment.   Tags 0center_img Share your voice How Facebook Dating works Security Post a comment 13 Photoslast_img read more

Housewife gangraped in Ctg


first_imgA housewife has allegedly been gang-raped by four culprits at Goalpara area in the port city early Saturday, reports UNB.Police detained three of the accused – Md Imran, 30, son of Abdul Halim, Md Shahjahan, 32, son of late Zamir Hossain, and Kaisar Halim Munna, 18, son of Abdul Halim of the same area.They along with a fourth individual who continues to avoid arrest, intercepted the housewife as she got out of her residence at dawn on Saturday, following a domestic dispute with her husband, and violated her by turn, second-officer of Karnaphuli police station Md Mostafa said quoting locals.Eventually the victim’s husband rescued her from the spot and filed a case with the police station accusing the four.The victim has been admitted to One Stop Service of Chittagong Medical College Hospital for medical check-ups added Mostafa. “Search is on to find out the other accused Nurul Amin, 27 who went into hiding soon after the occurrence”.last_img read more

Sri Lanka falls silent as toll soars to 310


first_imgSri Lankan military officials stand guard in front of the St. Anthony`s Shrine, Kochchikade church after an explosion in Colombo, Sri Lanka on 21 April 2019. Photo: ReutersSri Lanka began a day of national mourning Tuesday with three minutes of silence to honour more than 300 people killed in suicide bomb blasts that have been blamed on a local Islamist group.Flags were lowered to half mast on government buildings, and people bowed their heads and reflected silently on the violence that has caused international outrage.The silence began at 8:30am (0300 GMT), the time that the first of six bombs detonated on Sunday morning, unleashing carnage at high-end hotels and churches packed with Easter worshippers.Shortly after the silence was observed, a police spokesman said the toll had risen to 310, with several people dying of their injuries overnight.The first memorial services for the victims, among them dozens of foreigners, were planned for Tuesday, hours after the government imposed a state of emergency and said an Islamist group was behind the violence.At St Anthony’s Shrine in Colombo — where scores died as they gathered for Easter Sunday prayers — a crowd of a few dozen people held candles and prayed silently, palms pressed together.Some of them struggled to hold back tears and as the three minutes drew to a close, the crowd began to chant prayers.Police said that 40 people were now under arrest over the suicide bomb attacks — the worst atrocity since Sri Lanka’s civil war ended a decade ago.The attacks were also the worst ever against the country’s small Christian minority, who make up just seven percent of its population of 21 million.Investigators are now hunting for clues on whether the local Islamist group named as the chief suspect — National Thowheeth Jama’ath (NTJ) — received “international support”, said cabinet minister and government spokesman Rajitha Senaratne.The spokesman added that it was not possible for such “a small organisation” to carry out such well coordinated suicide strikes.President Maithripala Sirisena’s office said there was intelligence that “international terror groups” were “behind local terrorists” and that he would seek foreign help to investigate.The state of emergency, which gave police and the military special powers to counter militant strikes, came into force at midnight (1830 GMT Monday). Suspects can be detained without a court order.A second straight night-time curfew was also put in place, but lifted before dawn.Officials are also investigating why more precautions were not taken after an April 11 warning from Sri Lanka’s police that a “foreign intelligence agency” had reported the NTJ planned suicide attacks on churches.Senaratne said the warning was not passed on to Prime Minister Ranil Wickremesinghe or other top ministers.- Tensions high -Tensions remained high and security heavy after a bomb discovered by police on Monday near one of the targeted churches blew up before police could defuse it. Although there was a powerful blast, no injuries were reported.Police also found 87 bomb detonators at a Colombo bus station.Details have begun to emerge about some of the foreigners killed in the blasts.The United States reported at least four Americans killed — including a child — and the Netherlands raised their toll to three.A Danish billionaire lost three of his children in the attacks, a spokesman for his company said.Eight Britons, eight Indians and nationals from Turkey, Australia, France, Japan and Portugal, were also killed, according to Sri Lankan officials and foreign governments.The suicide bombers hit three Colombo luxury hotels popular with foreign tourists — the Cinnamon Grand, the Shangri-La and the Kingsbury — and three churches: two in the Colombo region and one in the eastern city of Batticaloa.Two additional blasts were triggered as security forces carried out raids searching for suspects.Interpol said it was deploying investigators and specialists to Sri Lanka, and the US State Department warned of possible further attacks in a travel advisory.- Memories of civil war -Ethnic and religious violence has plagued Sri Lanka for decades, with a 37-year conflict with Tamil rebels followed by an upswing in recent years in clashes between the Buddhist majority and Muslims.Burials were expected to begin for some of the dead on Tuesday.At St Sebastian’s, coffins were being brought in individually for services in the run-up to a mass memorial beginning mid-morning.”There are so many bodies that we can’t accommodate them all at once,” Anthony Jayakody, auxillary bishop of Colombo, told AFP.The attacks have sparked local and international outrage.Two leading Sri Lankan Muslim groups issued statements condemning the attacks, with the All Ceylon Jamiyaathuul Ulama, a council of Muslim theologians, urging the “maximum punishment for everyone involved in these dastardly acts”.last_img

Suspected Racial Profiling Results in GroupMe App to be Shut Down


first_imgBlack shoppers walk down M Street NW in Washington, D.C., browsing through stores in the Georgetown neighborhood. (Photo Courtesy Georgetown Business Improvement District)The mobile group messaging app GroupMe, owned by Microsoft, is claimed to have been a useful technological tool in Washington, D.C.’s Georgetown district, helping business owners to connect with police in real time in their efforts to curtail crime and targeting shoplifters along the neighborhood’s popular shopping strip. Now the app is in the process of being taken down, because of possible racial profiling toward Blacks.“The overriding goal of our retail community is to ensure that everyone who visits Georgetown feels welcomed, comfortable, safe, and that their civil rights and individual dignity are protected and respected. So long as there are questions about how this app is being used, this goal cannot be met,” wrote Georgetown Business Improvement District’s chief executive Joe Sternlieb in a statement, as cited in an Oct. 19 article in The Georgetowner.An Aug. 10 investigative report from the publication, “Critics Claim Racial Bias in Georgetown Digital Crime Prevention,” noted that although the community worked to identify threats and prevent crime beginning with the app’s launch in March 2014, it also “illustrated a stark racial disparity in how crime and suspicious behavior are reported in the community, raising hard questions about the relationship between community policing and civil rights.”The idea of using the app was introduced by Metropolitan Police Officer Antonial Atkins, who covers Georgetown. As a result, the Georgetown Business Improvement District (BID) began using the app as a go-between for retailers and police.Unfortunately, the app seemed to create a mechanism for racial profiling, critics say. Murray’s article stated that between March 1 and July 1, warned messages sent on the app targeted 330 people of which 236 were Black (72 percent). Only 16 percent were White.  Also, in terms of appearance, people with dreadlocks were often deemed “suspicious.”The Georgetown shopping area is known for its wide variety of fashionable stores in Northwest, where it begins at M Street all the way to Wisconsin Avenue. Shopaholics can find medium to high end priced stores such as TJ Maxx, Alex and Ani, Lacoste, Ann Taylor, Dean and DeLuca, Banana Republic and many others.One manager at the Nike store stated they used to use the GroupMe app but stopped it some time ago. A sales clerk at Barney’s New York said her manager was in a conference call. Ayana Ransom, a Black manager at All Saints, stated the app did help.“Yes, there are a lot of pictures of African Americans on the app,” Ransom said. “The shoplifters don’t look at the prices, they bring in old bags and sometimes wear sunglasses.” She picked up two shoplifters in the last three weeks.Two women, Stacy and Shaquanta, window shopping for fall fashions, said, “Basically, if you’re Black in America, you’re constantly under surveillance, you’re looked at frequently; honestly every day.”last_img read more

Efficient and stable emission of warm white light from leadfree halide double


first_img White light emission from a single emitter layer is of interest in lighting applications due to its simplicity compared to multiple emitters. Typically, broadband and white light emissions originate from self-trapped excitons (STEs) existing in semiconductors with localized carriers and a soft lattice. The authors focused on the double perovskite Cs2AgInCl6 as a promising material that emits warm white light due to its broad spectrum and all-inorganic, lead-free nature. The study optimized the alloy to form Cs2(Ag0.6Na0.4)InCl6 with a small percentage of bismuth doping to emit warm white light with increased quantum efficiency for more than 1000 hours. Materials for lighting applications can be defined as those emitting a “warm” white light for indoor applications and “cold” white light that approximates the visible region of the solar spectrum. In the study, Luo et al first sought to understand the origins of broadband emissions in Cs2AgInCl6 using mathematical modeling and computational studies to relax the lattice and represent self-trapped excitons (STEs) to investigate exciton-phonon coupling. Such systems will be fundamental to engineer the next generation of energy-efficient and cost-effective lighting and display technologies. A self-trapped exciton (STE) is defined as a bound electron-hole pair carrier that can dramatically enhance luminescence, energy transport and lattice defect formation in the crystal. The researchers found that STEs in the double perovskite Cs2AgInCl6, arose from strong Jahn-Teller distortion of the integral AgCl6 octahedron complex. The trapped excitons had a similar orbital character to the free exciton, indicating parity-forbidden transition (arising due to disruption of the centre of symmetry). The theoretical analysis showed an extremely low photoluminescence quantum yield (PLQY) for pure Cs2AgInCl6. To enhance the PLQY for practical applications as broadband materials, the system had to be modified, specifically by breaking parity-forbidden transition to manipulate the symmetry of the STE wavefunction. Explore further Lighting it up: A new non-toxic, cheap, and stable blue photoluminescent material Computational studies of self-trapped excitons (STEs) in Cs2AgInCl6. a) GW band structure of the double perovskite crystal (Cs2AgInCl6). The orbital characters and the free-exciton wavefunction are plotted as a fat-band structure. The green, blue, cyan and red colors denote the Cl 3p, Ag 4d, In 5s and Ag 5s orbitals. The magenta circles represent the lowest free-exciton amplitude. b) STE in Cs2AgInCl6, Cs atoms are omitted for clarity. The cyan and magenta isosurfaces represent the electron and hole orbital densities respectively. The electron state (red dashed circle) is extended and the hole state (black dashed circle) is compact, consistent with the small effective mass of the conduction band seen in (a). The inset shows the Jahn-Teller distortion of the AgCl6 octahedron. The hole isosurface is obvious and electron isosurface invisible due to its small density. c) Configuration coordinate diagram for the STE formation; Est, Ed and EPL are self-trapping, lattice-deformation and emission energies. d) The calculated photoluminescence spectrum compared with the experimental result. The calculated curve was shifted to align its maximum with that of the experimentally measured curve for better comparison. Credit: Nature, doi: https://doi.org/10.1038/s41586-018-0691-0 White light emission from Cs2Ag1−xNaxInCl6. a) Luminosity function (dashed line) and photoluminescence spectra (solid lines) of Cs2Ag0.6Na0.4InCl6 measured at different temperatures from 233 K to 343 K. b) Photoluminescence stability of Cs2Ag0.60Na0.40InCl6 against continuous heating on a hotplate, measured after cooling to room temperature. c) Operational stability of Cs2Ag0.6Na0.4InCl6 down-conversion devices measured in air without any encapsulation. The boxplot showed the results for the different samples measured separately with the box edges representing quartiles and band in the box representing the mean and maximum data. d) XRD patterns of a Cs2Ag0.6Na0.4InCl6 film (black line) and powder (red line). The inset shows a 300 nm thick quartz substrate and 500 nm thick Cs2Ag0.6Na0.4InCl6 films under 254 nm UV illumination. Credit: Nature, doi: https://doi.org/10.1038/s41586-018-0691-0. Since lattice mismatch between the two perovskites (Cs2AgInCl6 andCs2NaInCl6) was very low (0.3 percent) the scientists anticipated Na+ incorporation would occur without detrimental defects or phase separation. For the synthesis, CsCl, NaCl, AgCl and InCl3 precursors were mixed into an HCl solution in a hydrothermal autoclave. The mixture was heated for a defined period of time and cooled down to result in a final white precipitate product (90 percent yield). The pure double perovskite phase was confirmed using X-ray diffraction patterns (XRD) of a series of product compositions. The results agreed with plasma optical emission spectrometry (ICP-OES). The results were also in agreement with similar alloying experiments that were previously conducted with lithium (Li). The study thus suggested a general trend for alkali-metal-induced photoluminescent enhancement in double perovskites. Photoluminescence spectra were recorded for a series of product powders by varying the temperature of the measurements. The authors optimized the Na content alongside bismuth (Bi3+) doping to improve the crystal quality and slow cooling to obtain the highest PLQY (85 ± 5 percent) recorded thus far for white-light-emitting materials to form the optimally alloyed Cs2Ag0.6Na0.4InCl6 in the study. More information: Jiajun Luo et al. Efficient and stable emission of warm-white light from lead-free halide double perovskites, Nature (2018). DOI: 10.1038/s41586-018-0691-0 Yiru Sun et al. Management of singlet and triplet excitons for efficient white organic light-emitting devices, Nature (2006). DOI: 10.1038/nature04645 Zewen Xiao et al. Searching for promising new perovskite-based photovoltaic absorbers: the importance of electronic dimensionality, Materials Horizons (2016). DOI: 10.1039/C6MH00519E Citation: Efficient and stable emission of warm white light from lead-free halide double perovskites (2018, November 19) retrieved 18 August 2019 from https://phys.org/news/2018-11-efficient-stable-emission-white-lead-free.html Characterization of Cs2AgxNa1−xInCl6 with different Na content. All samples were doped using a small amount of (0.04 percent) Bi and the composition determined using ICP-OES. a) XRD patterns of Cs2AgxNa1−xInCl6 powders with different Na content were obtained. The Asterix marks the (III) diffraction peak, θ diffraction angle and au – arbitrary units. b) Optical absorption (solid lines) and photoluminescence (dashed lines) spectra of pure Cs2AgInCl6 and Cs2Ag0.6Na0.4InCl6. c) Activation energy and PLQY of Cs2AgxNa1−xInCl6 powder vs. Na content. The dashed lines guide the eye. d) Excitation spectra of photoluminescence measured at different wavelengths. e) Emission intensity vs. excitation power for Cs2Ag0.6Na0.4InCl6. f) Transient absorption spectra for Cs2Ag0.6Na0.4InCl6 (laser pulse of 325 nm), ∆ A/A is optical density. The irregular peaks located at ~650 nm is from frequency doubling of the pumping light. Credit: Nature, doi: https://doi.org/10.1038/s41586-018-0691-0. A practical approach to achieve this was via partial substitution of Ag with an element that could sustain the double perovskite structure. The substitute required a distinctively different electronic configuration to Ag, such as a group-IA element or alkali metal. The scientists therefore explored alloying Na into Cs2AgInCl6 to form pure Cs2NaInCl6, which demonstrated broadband emission on substitution but with very low efficiency due to strong phonon emission, requiring optimization of the Na content in the complex. Photoluminescence excitation (PLE) spectra confirmed STE origin of the white emission to experimentally confirm the calculated time-scale of exciton self-trapping. The Na perovskite (Cs2Ag0.6Na0.4InCl6) exhibited linear dependence on the photoexcitation power. Additional theoretical tests were done to understand how PLQY varied as a function of the Na content. As the Na content increased, the transition dipole moment increased and then decreased to support the composition-dependent PLQY observed in the study. The electron wavefunction of the STEs was also compared before and after alloying with Na. Incorporating Na broke the inversion symmetry of the Cs2AgInCl6lattice, changing the electron wavefunction at the Ag site from symmetric to asymmetric. Two factors contributed to the decrease in PLQY on further increase of the Na content. The first was orbital overlap between electrons and holes of the STEs upon increased Na content. The second reason for the observed decrease in PLQY with increased Na was due to increased non-radiative loss in the Na-rich alloy. The scientists then developed a white light emitting diode (LED) by directly pressing the Na perovskite powders on to a commercial ultraviolet LED chip, without epoxy or silica encapsulation for protection. With the contribution from the blue light of the UV LED chip the device demonstrated a color temperature of 4,054 K to fulfill requirements for indoor lighting. When the white LED was operated for more than 1000 hour in air, negligible degradation was observed. The outstanding photometric performance combined with easy manufacture indicated promise for white-phosphor lighting applications. In this way, the scientists presented a new strategy to produce broadband emission associated with the STEs for single-material based white-light electroluminescence, allowing prototype double-perovskite based electroluminescence device formation. To increase electroluminescence performance in the future, further research should focus on optimizing the emitting-layer quality of the Cs2Ag0.6Na0.4InCl6 films. The study showed that alloying Na into Cs2AgIn Cl6 broke parity-forbidden transition as anticipated to reduce its electronic dimensionality and enable efficient white light emission via STEs.The white light emitting material also demonstrated low cost manufacture and exceptional stability as a promising solid-state lighting platform. The authors believe that such halide double perovskites hold great possibility for applications in display and lighting after further study to realize their full potential. The results will stimulate research on single-emitter-based white-light-emitting phosphors and diodes to generate the next-generation of lighting and display technologies. One-fifth of global electricity consumption is based on lighting; efficient and stable white-light emission with single materials is ideal for applications. Photon emission that covers the entire visible spectrum is, however, difficult to attain with a single material. Metal halide perovskites, for instance, have outstanding emission properties but contain lead, and therefore yield unsatisfactory stability. A new report published by Jiajun Luo and co-workers details a lead-free double perovskite that exhibited stable and efficient white light emission. In its mechanism of action, the material produced self-trapped excitons (STEs) due to Jahn-Teller distortion of the AgCl6 octahedron in the excited state of the complex, observed when investigating exciton-phonon coupling in the crystal lattice. The results are now published in Nature. A key challenge for lighting applications is the parameter of emission stability. The Cs2Ag0.6Na0.4InCl6perovskite showed stable emission in the study with little emission degradation. When the powder was annealed to a hotplate, only minimal photoluminescence decay of the white emission was observed, the authors proposed that the observations may be due to strongly bound excitons and a nearly defect-free lattice that prevented photoluminescence quenching while resisting thermal stress. Schematically visualizing the phonon band structure of Cs2AgInCl6 and the zone-center Jahn-Teller phonon mode (inset). The Jahn-Teller phonon mode coupled to the photoexcited excitons were responsible in the formation of self-trapped excitons in the Cs2AgInCl6 complex. Credit: Nature, doi: https://doi.org/10.1038/s41586-018-0691-0 Journal information: Nature © 2018 Science X Network Mechanistic investigation of PLQY in Cs2Ag1−xNaxInCl6. a) Transition dipole moment (µ) in Cs2Ag1−xNaxInCl6 as a function of Na content in the system. b) Parity change of the electron wavefunction of the STE before and after Na incorporation (pure and alloy). The cyan and magenta isosurfaces indicate electrons and holes c) Configurations showing strengthened STE confinement by the surrounding NaCl6 octahedra. d) STEs in Na-rich Cs2Ag1−xNaxInCl6. The STE is located in two neighboring octahedra. e) Configuration coordinate diagram of the STE formation in Cs2NaInCl6 (inset). Credit: Nature, doi: https://doi.org/10.1038/s41586-018-0691-0. This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. 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Roughly two thirds of US adult broadband users now


first_imgRoughly two thirds of US adult broadband users now take online subscription video-on-demand services on a home TV, according to TDG research.The Diffusion Group study claims that 44% of TV subscription streamers are under the age of 34 and that 25% turn to SVOD services first when they turn on their TV.TV streaming viewers spend on average 41% of their weekly TV time watching streaming video of some kind – with SVOD use described as “dominant” and TVOD and AVOD “prominent”.SVOD viewing was also not limited to TVs, with 79% watching SVOD services on PCs, 46% on tablets, and 59% on smartphones.last_img read more