Current bright blue LEDs are based on the wide band gap semiconductors GaN (gallium nitride) and InGaN (indium gallium nitride). They can be added to existing red and green LEDs to produce the impression of white light, though white LEDs ...
Bare uncoated semiconductors such as silicon exhibit a very high refractive index relative to open air, which prevents passage of photons at sharp angles relative to the air-contacting surface of the semiconductor. This property affects ...
Tags: LED
Back in 1960 Electronics Weekly was born into a ferment of III-V semiconductor research that within two years would produce the first practical LED. In 1960 Dr Nick Holonyak of General Electric was developing an unusual material,GaAsP,as ...
Tags: General Electric, LED history, USA
An unusual new LED downlight fitting from Flos combines desirable beam characteristics with flexible aesthetic detailing through the use of acrylic 'pipes'. Peter Stuart sees BDP's Mark Ridler put it through a bench test ...
Mainz,November 27,2012–The SCHOTT technology group has developed a nanostructuring technique for surfaces that already ranks among the important emerging technologies:so-called nanoimprint lithography.This technological platform ...
Tags: SCHOTT, nanoimprint lithography, specialty glasses and materials, glass
The GaN wafers developed by NGK feature low defect density across the entire 2-inch diameter of the wafer surface and have a colorless transparency. NGK achieved this through proprietary improvements to liquid phase epitaxial technology for ...
Tags: GaN wafers, green LED chips, LED
NGK Insulators Ltd of Nagoya, Japan has developed gallium nitride (GaN) wafers that significantly reduce defects and approximately double the luminous efficiency of green light-emitting diodes (LEDs) over previous models. The GaN wafers ...
Researchers in Korea and India have used zinc oxide (ZnO) nanorods on the rear side tolight-emitting diodes (LEDs) grown on c-plane sapphire [Joo Jin et al, Jpn. J. Appl. Phys., vol51, p102101, 2012]. The researchers were based at Chonbuk ...
Tags: LED
Researchers in China have applied graphene as transparent conducting layers (TCLs) in vertical light-emitting diodes (VLEDs) made from indium gallium nitride (InGaN) semiconductors. The researchers were based in Beijing at Chinese Academy ...
Tags: LED
The 2012 update of the SSL Manufacturing R&D Roadmap guides research programs in LED and OLED manufacturing with the goal of meeting aggressive cost targets for 2015 and 2020. The US Department of ...
Efficacy The holy grail of the light source. Offering a white light of up 150 lm/w (in laboratory tests). This is the area where the most focus is being placed. The efficacy of LEDs is very much affected by temperature. LEDs utilise a ...
Tags: LED, Light Emitting Diodes
UK-based Plessey readies for volume chip production, while Germany's Azzurro Semiconductors gains support for move to larger wafers. GaN-on-silicon LED A disruptive approach to lowering the cost of solid-state lighting (SSL) with ...
Tags: LED Chip
Researchers in Korea have been studying how to improve graphene transparent conducting layers(TCLs)using gold nanoparticle(Au-NP)decoration.The team was variously associated with Gwangju Institute of Science and Technology,Korea Basic ...
Silicon nitride protection for graphene electrodes in UV-LEDs Korea University, US Naval Research Laboratory and University of Florida have improved the reliability of graphene electrodes in ultraviolet light-emitting diodes (UV-LEDs) ...
According to a doctoral thesis released by Gul Amin of Linköping University,white LEDs made from zinc oxide(Zn02)and a conducting polymer can be manufactured directly on a piece of paper. Nanostructures of Zn02 have a number of ...
Tags: white LEDs, Zn02, Gul Amin