PRESS-NEWS.org - Press Release Distribution
PRESS RELEASES DISTRIBUTION

Chloride ions kill the stability of blue perovskite light emitting diodes

Chloride ions kill the stability of blue perovskite light emitting diodes
2023-11-29
(Press-News.org)

Blue light-emitting diodes represent a fundamental element in the contemporary lighting and display technology landscape. Like prevailing technology such as III-V, organics and quantum dot LEDs, developing efficient and stable blue perovskite light-emitting diodes (PeLEDs) is a formidable challenge. Over the past few years, the research community has experienced a remarkable upsurge in the external quantum yields of blue PeLEDs, bringing them closer to the level of more mature technologies. Nevertheless, these blue PeLEDs continue to grapple with a pronounced Achilles' heel - a disconcerting lack of operational stability. Even under relatively mild operating conditions, their half-lifetime extends from mere tens of seconds to just a few minutes. This issue has emerged as a pivotal obstacle to their future commercial viability.

 

The research team led by Prof. Weidong Xu at Northwestern Polytechnical University in China and Prof. Feng Gao at Linköping University in Sweden have found the reasons behind the short operational lifetime of blue PeLEDs. Typically, mixed chloride/bromide perovskites are employed to produce ideal blue emission. However, the researchers have uncovered a counterintuitive fact: even minute quantities of chloride loading exert a dramatic negative impact on the operational lifetime of these devices. They also find that such an issue is an intrinsic problem that chloride ions are of a very low migration energy barrier in mixed bromide/ chloride perovskites, making them rapidly leave perovskite films under electrical bias. These findings underscore the necessity for innovative strategies to immobilize chloride ions within blue perovskite emitters. The work entitled “Role of chloride on the instability of blue emitting mixed-halide perovskites” was published on Frontiers of Optoelectronics (published on Nov. 17, 2023).

END


[Attachments] See images for this press release:
Chloride ions kill the stability of blue perovskite light emitting diodes

ELSE PRESS RELEASES FROM THIS DATE:

Attending early education during pandemic provides sustained benefits for youngsters’ development 

2023-11-29
The more time pre-schoolers spent in childcare during the first year of the pandemic, the more their vocabulary grew, a new study has found.  Research led by the University of Leeds found that attending Early Childhood Education and Care (ECEC) during the Covid-19 outbreak had sustained benefits for youngsters’ development.  Academics investigating the ongoing impact of Covid-related closures found that for each day of the week spent in ECEC, toddlers could produce an average of 29 more new words over the first year of the pandemic and ...

Understanding rapid tendon regeneration in newts may one day help human athletes

Understanding rapid tendon regeneration in newts may one day help human athletes
2023-11-29
A research group led by Nagoya University’s Graduate School of Engineering has uncovered how rapid tendon regeneration occurs in newts. The research, published in the Journal of Orthopaedic Research, compared the regeneration mechanism of damaged tendons in newts with those in mice. In the future, their findings could help physicians to treat human athletes recovering from tendon injuries.     Tendon injuries are a serious obstacle for athletes, who currently require several months ...

Project will look for rare-earth elements in Southeast Alaska seaweed

Project will look for rare-earth elements in Southeast Alaska seaweed
2023-11-29
A University of Alaska Fairbanks–led research team has been awarded a $1.9 million federal grant to explore whether seaweeds are absorbing rare-earth elements near a rich deposit in Southeast Alaska. The study will focus on seaweeds in the waters near Bokan Mountain, a remote landmark on Prince of Wales Island known to contain rare-earth elements. Starting in March 2024, researchers will collect and analyze seaweed samples to determine whether significant amounts of metals that have washed into the ocean are being absorbed. “We want to see if seaweeds accumulate ...

Researchers find connections between neuroinflammation and Alzheimer’s disease

2023-11-29
Study by Brigham investigators revealed how genetic changes in certain types of brain cells may contribute to the inflammatory response seen in Alzheimer’s disease  Immune-regulating brain cells known as microglia are known to play a role in the progression of Alzheimer’s disease (AD). A new study by investigators from Brigham and Women’s Hospital, a founding member of the Mass General Brigham healthcare system, explores how the genetics of microglia contribute to neuroinflammation and, in turn, AD. The team revealed that a reduction ...

Sexual assault survivors deserve a gold standard reporting experience

2023-11-29
A world-first report examining alternative ways for victim-survivors to report sexual assault says under-reporting could be reduced if moved away from law enforcement, but it will need greater support and funding to be sustainable and secure.  Only 13% of women report sexual assaults to police and 50% of victim-survivors seek help from a counselling or specialist support service, but alternative reporting options could help increase these numbers.  The research by RMIT University, University of Wollongong and La Trobe University found a trauma-informed, written interview designed in line with best-practice techniques could ...

New combination improves radiation therapy outcomes in patients with locally advanced and borderline resectable pancreatic cancer

New combination improves radiation therapy outcomes in patients with locally advanced and borderline resectable pancreatic cancer
2023-11-29
First author Cullen Taniguchi, M.D., Ph.D., passed away suddenly before the final publication of this study. A talented physician-scientist motivated by the impact of cancer on his own family, Taniguchi was committed to improving treatment options and outcomes for patients with gastrointestinal cancers as well as mentoring aspiring physicians and scientists.  “Dr. Taniguchi was a pioneer, committed to not accepting the low rates of survival in pancreatic cancer and transcending boundaries to improve outcomes,” said senior author Sarah Hoffe, M.D., of Moffitt ...

Plastic pollution from cigarette butts likely costs US$26 billion/year or US$186 billion over 10 years

2023-11-29
The costs of environmental pollution caused by plastics in cigarette butts and packaging amount to an estimated US$26 billion every year or US$186 billion every 10 years—adjusted for inflation—in waste management and marine ecosystem damage worldwide,  finds a data analysis published online in the journal Tobacco Control. These costs may seem small compared with the overall economic and human toll of tobacco, but they are cumulative and preventable, highlights the researcher.  And ...

Faster walking speed of 4 km+/hour linked to significantly lower type 2 diabetes risk

2023-11-29
Walking at a speed of 4 or more km an hour is linked to a significantly lower risk of type 2 diabetes, suggests a pooled data analysis of the available evidence, published online in the British Journal of Sports Medicine. And the faster the speed above 4 km/hour, the lower the risk seems to be, with every 1 km increase in speed associated with a 9% reduction in risk, the findings suggest.  While regularly nipping out for a stroll is associated with a lower risk of developing type 2 diabetes, it’s not clear what the optimal speed might be to ward off the disease, ...

Five-fold rise in UK rates of transgender identity since 2000, medical records suggest

2023-11-29
UK rates of transgender identity have risen 5-fold since 2000, with the highest rise observed among 16 to 29 year olds, although the overall numbers are still small, suggests an analysis of nearly 20 years of anonymised general practice records, published online in the open access journal BMJ Medicine. And rates of people identifying as transgender were more than twice as high in the most socially and economically deprived areas as they were in less deprived areas, the analysis shows.  A solid grasp of the numbers and ages of those identifying as transgender is essential ...

6+ hours/day of sedentary leisure time linked to doubling in fibroids risk

2023-11-29
Clocking up 6 or more hours of sedentary leisure time every day may double a woman’s risk of uterine fibroids before she’s gone through the menopause, suggests research published in the open access journal BMJ Open. The risk of these benign, but potentially large and painful, womb growths seems to rise in tandem with the amount of time spent sitting or lying down during the day, the findings suggest. Uterine fibroids are the most common benign tumours in women of childbearing age, varying in prevalence from 4.5% to 69%, say the researchers.  These growths may not produce any symptoms, but they may also be associated with abnormal bleeding, pelvic and abdominal pain, ...

LAST 30 PRESS RELEASES:

Sexual health symptoms may correlate with poor adherence to adjuvant endocrine therapy in Black women with breast cancer

Black patients with triple-negative breast cancer may be less likely to receive immunotherapy than white patients

Affordable care act may increase access to colon cancer care for underserved groups

UK study shows there is less stigma against LGBTQ people than you might think, but people with mental health problems continue to experience higher levels of stigma

Bringing lost proteins back home

Better than blood tests? Nanoparticle potential found for assessing kidneys

Texas A&M and partner USAging awarded 2024 Immunization Neighborhood Champion Award

UTEP establishes collaboration with DoD, NSA to help enhance U.S. semiconductor workforce

Study finds family members are most common perpetrators of infant and child homicides in the U.S.

Researchers secure funds to create a digital mental health tool for Spanish-speaking Latino families

UAB startup Endomimetics receives $2.8 million Small Business Innovation Research grant

Scientists turn to human skeletons to explore origins of horseback riding

UCF receives prestigious Keck Foundation Award to advance spintronics technology

Cleveland Clinic study shows bariatric surgery outperforms GLP-1 diabetes drugs for kidney protection

Study reveals large ocean heat storage efficiency during the last deglaciation

Fever drives enhanced activity, mitochondrial damage in immune cells

A two-dose schedule could make HIV vaccines more effective

Wastewater monitoring can detect foodborne illness, researchers find

Kowalski, Salonvaara receive ASHRAE Distinguished Service Awards

SkAI launched to further explore universe

SLU researchers identify sex-based differences in immune responses against tumors

Evolved in the lab, found in nature: uncovering hidden pH sensing abilities

Unlocking the potential of patient-derived organoids for personalized sarcoma treatment

New drug molecule could lead to new treatments for Parkinson’s disease in younger patients

Deforestation in the Amazon is driven more by domestic demand than by the export market

Demand-side actions could help construction sector deliver on net-zero targets

Research team discovers molecular mechanism for a bacterial infection

What role does a tailwind play in cycling’s ‘Everesting’?

Projections of extreme temperature–related deaths in the US

Wearable device–based intervention for promoting patient physical activity after lung cancer surgery

[Press-News.org] Chloride ions kill the stability of blue perovskite light emitting diodes