Researchers in Guangdong province, China, have been exploring the potential for improved light extraction from nitride semiconductor light-emitting diodes (LEDs) on patterned sapphire substrates with spherical cap bumps [Haiyan Wang et al, ...
Tags: LEDs, Electrical, Electronics
Researchers based in the USA have used a double-heterostructuring based on order-disorder properties of aluminium indium phosphide (AlInP) to produce 'amber-green' light-emitting diodes (LEDs) [Theresa M. Christian et al, J. Appl. Phys., ...
Tags: LEDs, Electrical, Electronics
Researchers in China and Turkey have been using varying-thickness gallium nitride (GaN) barriers between indium gallium nitride (InGaN) multiple quantum wells (MQWs) to improve hole distributions and thus to reduce efficiency droop effects ...
Tags: InGaN LEDs, Electrical, Electronics
Researchers in China have been developing nanopatterned-sapphire substrates (NPSS), achieved with nano-sphere lithography (NSL), as a basis for the production of superior aluminium gallium nitride (AlGaN) semiconductor material for deep ...
Tags: DUV LEDs, LED, Electrical, Electronics
Peking University has found that using a pre-strain layer in nitride semiconductor epitaxial structures designed for blue laser diodes (LDs) can reduce the efficiency-sapping quantum-confined Stark effect (QCSE) [Cao Wen-Yu et al, Chin. ...
The Chinese Academy of Sciences’ Institute of Semiconductors and Tsinghua University claim “the first proof-of-concept experimental demonstration of the current-driven pyramid array InGaN/GaN core-shell LEDs interconnected with ...
Tags: Pyramid-array LEDs, Graphene Electrodes, GaN, MOCVD
Northwestern University's Center for Quantum Devices has developed a suface-plasmon (SP) enhancement technique for ultraviolet (UV) light-emitting diodes (LEDs) produced on silicon substrates [Chu-Young Cho et al, Appl. Phys. Lett., vol102, ...
Tags: UV-LEDs, Electrical, Electronics
A contentious controversy surrounds the high intensity of indium gallium nitride (InGaN) LEDs, with experts split on whether or not indium-rich clusters within the material provide their remarkable efficiency. Now, researchers from the ...
Tags: InGaN LEDs, Electronics
Kim Kisslinger, seen here with a focused-ion beam instrument, reduced the InGaN samples to a thickness of just 20 nanometers to prepare them for electron microscopy. From the high-resolution glow of flat screen televisions to light bulbs ...
Tags: Atomic-Scale, LED
Researchers in Korea have used three-dimensional (3D) graphene foam as a transparent conductor for the p-contact of blue nitride semiconductor light-emitting diodes (LEDs) [Byung-Jae Kim et al, Appl. Phys. Lett., vol102, p161902, 2013]. The ...
Tags: Graphene foam, LEDs
Researchers in China have used strain engineering to improve the light output power of 530nm green light-emitting diodes (LEDs) by 28.9% at 150mA current injection [Hongjian Li et al, Appl. Phys. Express, vol6, p052102, 2013]. The research ...
Gwangju Institute of Science and Technology and Samsung Electronics Co Ltd of South Korea have developed a zinc oxide (ZnO) nanorod (NR) process for improving light extraction from gallium nitride (GaN) light-emitting diodes (LEDs) by up to ...
Tags: GaN, LEDs, Electronics
Researchers in South Korea have developed a new gold-doping process for graphene transparent conducting layers (TCLs) that improves its adhesion and electrical contact with near-ultraviolet light-emitting diodes (NUV-LEDs) [Chu-Young Cho et ...
Tags: NUV-LEDs GaN Graphene, Electrical, Electronics, LED
Researchers in China have developed an atomic layer deposition (ALD) technique to create distributed Bragg reflectors (DBR) for increasing nitride semiconductor light-emitting diode (LED) output power by up to 43% [Hongjun Chen et al, Appl. ...
Tags: DBR ALD MOCVD LEDs GaN, Lighting, LED
Taiwan researchers have used a self-textured oxide mask (STOM) as a template to enhance the external quantum efficiency (EQE) of nitride 380nm ultraviolet (UV) light-emitting diodes (LEDs) by up to 83% [Kun-Ching Shen et al, IEEE Electron ...
Tags: LED light, LED, LED light extraction