Hybrid LEDs Operate at Room Temperature for High Speed Communication

City College of New York (CCNY) announced their research breakthroughs in the realm of photonics, the researchers successfully demonstrated an LED based on half-light half-matter quasiparticles in atomically thin materials. According to CCNY, this is also the first successful test of an electrically driven light emitter using atomically thin semiconductors embedded in a light trapping structure. (Schematic of a half-light- half-matter quasiparticle based LED developed in Vinod Menon's group using atomically thin materials. Image credit: Visakh Menon) The ...
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New Approach of InGaN Nanowire LEDs on Flexible Substrate

After publishing the research paper demonstrating Micro LED integration with amorphous silicon TFTs, the research team from the University of Waterloo in Canada further revealed its approach of transferring InGaN nanowire LEDs on flexible substrate without degrading optical performance of the LEDs when the substrate bends. Researchers use vertical GaN nanowire LEDs to separate the electrically active region of the LEDs from the bending platform. LEDs are transferred onto flexible polyethylene terephthalate (PET) with a “paste and cut” process...
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Japanese Researcher Uses Urine Drops to Power LED for Hours

LEDs can be lit on by urine without electricity! A Japanese professor developed a fuel cell which can be powered by urea, a component of urine, to light up LEDs. The approach would offer light source when being in places without electricity such as in the mountains or in times of disaster. The Japan News reported that Keiichi Kaneto, a visiting professor at the Osaka Institute of Technology, created an electricity generable sheet which contains an alloy of copper and nickel and was coated by resin. The sheep reacted to urine drops and could then illuminate a small blue L...
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Advanced Efficiency of Perovskite LEDs Achieved with Interlayer Reaction

Scientists at Linkoping University working with colleagues from China have shown how to achieve efficient perovskite LEDs. In an article published in Nature Communications, they provide guidelines on fabricating high-quality perovskite light emitters for high-efficiency perovskite LEDs. Since solution-processed perovskites contain large amounts of defects, which are mostly halide vacancies, efficient control of the perovskite crystallinity is required for high-performance optoelectronic devices. The research group at LiU, under the leadership of Senior Lecturer Feng G...
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Study Introduces High Efficiency Deep UV LEDs Based on AlGaN

AlGaN-based DUV-LEDs are receiving much research attention due to their potential use in sterilization, water purification, phototherapy, and sunlight-independent high-speed optical communication. Scientists are investigating ways to improve their efficiency in converting electrical energy into optical energy. Deep UV LEDs made from AlGaN efficiently transfer electrical energy to optical energy due to the growth of one of its bottom layers in a step-like fashion. This finding, published in the journal Applied Physics Letters, can lead to the development of even more...
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Japanese Research Team Uses LEDs to Oxidize Plastic

Using LED as a light source, researchers at Osaka University have now developed a convenient light-driven process for oxidizing polypropylene (PP) without harmful waste. The research team used radicals to make the plastic react. Scholars chose an LED lamp as the light source photo-chemically activate radicals for breaking down the chemical bonds which make plastic unreactive and hard to decompose. "In applications like printing and medical materials, plastics must be surface-modified," explained Tsuyoshi Inoue, co-author of the study. "Oxidizing C-H bo...
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New Research of Semiconductor Homostructures can Lead to LED Technology Breakthrough

Superinjection is a physical effect that underlies modern LEDs and lasers and was believed to occur only in semiconductor heterostructures in the past. Recently, researchers from the Moscow Institute of Physics and Technology (MIPT) have found that the effect can also occur in homostructures, which opens up new prospects for the development of light sources. In the 1960’s, Zhores Alferov and Herbert Kroemer proposed to use heterostructures, which consist of two or more complementary semiconductors to generate wider bandgaps, enabling the concentration of electrons ...
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New Red Phosphor to Improve LED Energy Efficiency Co-Developed by University of Innsbruck and Osram

A research team at the University of Innsbruck, Austria cooperated with Osram Opto Semiconductors to develop a new red phosphor with excellent luminescence properties which can make LED lighting more energy-efficient. The research article, titled “Sr[Li2Al2O2N2]:Eu2+—A high performance red phosphor to brighten the future” was published in Nature Communications on April 23, 2019. The scientists created the new red phosphor whose light is well perceived by the eye as the human eye is more sensitive to green and less sensitive to blue and red. With th...
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Researchers Create New LED from “Multi-Particle Exciton Complexes”

A research team at Vienna University of Technology (TU Wien) developed a new kind of LED which generates light from the radiative decay of exciton complexes in extremely thin layers. Researchers produced what they called as “multi-particle exciton complexes” by applying electrical pulses to extremely thin layers of material made from tungsten and selenium or sulphur. These exciton clusters are bonding states made up of electrons and “holes” in the material and can be converted into light. The result is an innovative form of light-emitting diode in whic...
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Perovskite-based NIR LED Achieves Record Efficiency

An international research team has developed near-infrared (NIR) LED based on perovskite in a laboratory at Linköping University in Sweden which achieve a record external quantum efficiency of 21.6 percent Perovskites have good light-emitting properties and are easy to manufacture. However, the external quantum efficiency of perovskite-based LED has until now been limited due to defects that arise in the material during manufacture. The defects act as traps for the charge carriers and thus cause energy losses. (Image: Linköping University) To solve the ...
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KIT Develops Street Lights with Interconnected LEDs to Reduce 20% Power Consumption

Researchers of Karlsruhe Institute of Technology (KIT) in Germany have developed a novel, even more economical LED street light by replacing conventional high-performance LED with a special array of weaker LEDs. The new approach succeeded in reducing power consumption by 20 percent. Michael Heidinger at KIT's Light Technology Institute (LTI) designed a smart circuit that compensates aging and failure of individual LEDs. With the new approach, it is possible to install a large number of LEDs on a single board at low cost. Moreover, the LEDs incre...
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New Approach to Measure and Adjust LED Spectra to Ensure Lighting Quality for Human Centric Lighting Applications

For keeping the quality and effect of tunable LED lighting used in human centric lighting applications, a new research proposed novel methods to overcome the challenges of temperature change and lumen decay of LEDs. The research team demonstrated a system to maintain consistency and stability of LED light source over an extended period of time. Featured with tunable color temperature and spectrum, LED has been increasingly adopted in the developing human centric lighting applications in medical, educational and working environment for improving human well-being. Some of th...
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NIST Develops GaN Core-Shell Nanowire UV LED with 5 Times Intensity

A research team at National Institute of Standards and Technology (NIST) has developed nanowire UV LEDs that are able to produce five times higher light intensity based on a simpler shell design. UV LEDs are used in a growing number of applications such as polymer curing, water purification and medical disinfection. Researchers at NIST have been trying to make nanowire-based LEDs for scanning-probe tips intended for electronics and biology applications. Lately, researchers have been experimenting with nanowire cores made of silicon-doped GaN, which has extra ...
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New Research on Perovskite LEDs with Enhanced Stability and Optical Properties

In order to improve the efficiency and lighting quality of LEDs, metal halide perovskites have been considered as a next generation material. Perovskite LEDs (PeLEDs) as emerging light-emitting technology have attracted attentions with the advantages of low manufacturing cost, high light quality and energy efficiency. A research co-led by the scientists from City University of Hong Kong (CityU) and Shanghai University developed a new manufacturing process to enhance optical properties and stability of perovskite LEDs. The research team used cesium trifluoroacetate...
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Researchers Improve LED Efficiency with Inspiration from Fireflies

The way fireflies light up their lanterns has become an inspiration to increase the efficiency of LED. Researchers at the Pennsylvania State University (Penn State) found out that LEDs made with firefly-mimicking structures could improve lighting efficiency. Enhancing luminous efficiency of LED has been a research field for many scientists. Stuart (Shizhuo) Yin, professor of electrical engineering at Penn State, noted, "Overall commercial LED efficiency is currently only about 50 percent. One of the major concerns is how to improve the so-called light extra...
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Research Shows LED Can Cool Down Electronics Devices with Reversed Electrodes

Researchers found a new method of photonic cooling by running LED with electrodes reversed. Researchers believe that this approach could improve cooling technology for future microprocessors, which will include various transistors in a small space that current methods cannot remove heat quickly enough. The finding was published on Nature on February 13 by a research team at the University of Michigan. Linxiao Zhu, the lead author on the research article, explained, “Usually for thermal radiation, the intensity only depends on temperature, but we actually have an additio...
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A New Material Produces White Light and Increases Efficiency of LED

An international team discovered a single material which produces white light to improve LED lighting efficiency. The renewable energy research was recently published in Nature with the article contributed by researchers from The University of Toledo, Monash University, Jilin University, University of Toronto, Tsinghua University, Chinese Academy of Sciences and Wuhan University. (Image: Pixabay) Dr. Yanfa Yan, professor of physics at The University of Toledo, explained, "Due to its high efficiency, this new material can potentially replace the curre...
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Infrared LED Efficiency Increased with Colloidal Quantum Dots

Researchers at the Barcelona Institute of Science and Technology have developed LEDs comprising infrared colloidal quantum dots that enable high efficiency and low cost CMOS integration. Colloidal quantum dots are extremely small semiconductor particles which are as small as a few nanometers in size. Featured with small size, CQDs offer unique optical and electronic properties including absorbing and emitting light. Moreover, their properties change with their size and shape, smaller quantum dots emit in the blue range while larger quantum dots emit in the red. (Ima...
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Scientists Develop OLED with Radicals to Increase Efficiency

Scientists have developed several types of LED including OLEDs, quantum-dot-based LEDs (QLED), perovskite-based LEDs and Micro LEDs for the purpose of enhancing the brightness, contrast and resolution of displays as well as to reduce the production cost and energy use. A new research published on Nature has illustrated a development of OLEDs using free radicals which generate doublet emission with higher efficiency. In the research, scientists from China and the UK have demonstrated radical-based OLEDs that could reach an external quantum efficiency of ...
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LED Technology Breakthrough: LED Performance Advances with Perovskite

  Scientists have continuously worked on improving the performance of LED. LED based on Perovskite (PLED) could be a new approach. Scientists have found out that the performance of the material surpasses OLED and that it could be processed with low cost solutions. Two research teams have published their studies of perovskite LED on Nature in October, notifying the potential of its further development.
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Study Finds LEDs Safe for Skin Applications

There was a time when no one thought about light bulbs—one blew, you screwed another one in. Nowadays, it’s more complicated, as energy efficiency concerns have given rise to a slew of options, including incandescent, compact fluorescent lights, and LEDs.
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Chinese Researchers Develop Phosphor-free White Light from Nanopyramid LEDs

For the cool white NPW LEDs, the spectrum is similar to the conventional white LEDs obtained from the blue LEDs combined with yellow phosphors. The blue emission originates from the upper sidewalls of nanopyramids, and yellow light is mainly emitted from the lower ridges with respect to the base of nanopyramids. 
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LEDinside: Taiwan LED Makers’ Revenue Stayed Flat in June, LED Industry to Face Severe Challenge in 2H12

According to LEDinside, the LED research division of TrendForce, the June revenues of Taiwanese listed LED manufacturers totaled NT$8.8 billion (MoM+1.12%, YoY-5.6%). Benefiting from the climbing demand for consumer electronic appliances and the traditional lighting peak season, the LED industry’s 2Q12 revenue reached NT$25.82 billion (QoQ+22.7%). Looking towards the second half of 2012, the LED industry will face a severe challenge – affected by the lukewarm economic outlook and the European debt crisis, the future for end market does not seem b...
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12’May LED Light Bulb ASP Stayed Flat Under the Impact of New Product Introduction

According to the latest price survey by LEDinside, the LED research division of TrendForce, in May 2012, global LED light bulb price basically remained stable without dramatic fluctuations. 40W equivalent LED light bulb ASP saw no remarkable changes as prices of existing products around the world kept flat or slightly dropped while general prices of new arrivals were relatively high. On the other hand, 60W equivalent LED light bulb ASP dipped by 1% to USD 33.5, price falls mainly occurring in Korea and UK.   40W equivalent LED light bulb: prices o...
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12’Feb LED Light Bulb ASP Slid 20% in U.S., Japanese Wide Beam Products Garner Attention

ASP of 40W equivalent LED light bulb slid below US$20 in U.S. According to the latest survey conducted by LEDinside, the LED research division of TrendForce, the global LED light bulb price continued to dip in 12’Feb, but the downtrend has curbed – the ASP of 40W equivalent LED light bulb merely dropped 0.1%, while the ASP plummeted by 19% in the United States to below US$20. The global ASP of 60W equivalent LED light bulb dropped to US$33.6, and the price downtrend was most prominent in the United States and Japan. ASP ...
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Nichia’s Tunable 757 receives rave reviews from industry leaders, including the coveted LpS Best Sustainability Technology Award. Nichia, the leader in and inventor of the high-brightness LED, announced its game-changing single LES, tuna... READ MORE

Innovative tunable white, mid-power LED enables luminaire manufacturers to improve colour tuning, shrink optics and fixture profiles, while enabling new design options. Nichia, the leader in and inventor of the high-brightness LED, announces i... READ MORE