Sputtering method cuts cost of producing GaN LEDs
June 25, 2014 // Paul Buckley
A team of University of Tokyo researchers in Japan have developed a technology for creating GaN LEDs on glass substrate which could not only cut manufacturing costs but also help to develop OLED light panels.
The researchers use a sputtering method to transcribe the GaN LEDs onto the glass substrate. The team has not yet measured luminous efficiency or external quantum efficiency for any single color but are currently testing the efficiency of the internal quantum at low temperatures.
InGaN-based light-emitting diodes (LEDs) have been widely accepted as highly efficient light sources capable of replacing incandescent bulbs but applications of InGaN LEDs are limited to small devices because their fabrication process involves expensive epitaxial growth of InGaN by metalorganic vapor phase epitaxy on single-crystal wafers.
The researchers have used a low-cost epitaxial growth process, such as sputtering on large-area substrates, to fabricate large-area InGaN light-emitting displays.
By using multilayer graphene buffer layers the growth of highly c-axis-oriented GaN films even on amorphous substrates was feasible. The research team fabricated red, green, and blue InGaN LEDs and confirmed their successful operation.
The researchers believe that by demonstrating that full-color LEDs can be fabricated on amorphous substrates and sputtering is frequently used in the LCD industry so a process could be adapted to fabricate large-area inorganic LED displays on glass substrates.
The researchers point out that state-of-the-art technology in the glass industry can offer roll-to-roll processing of flexible glass foils and a combination of these techniques can lead to the development of large-area flexible inorganic devices.
Related articles and links:
Can InN nanowires answer LED 'green-gap' energy problems?
Innovative GaN on GaN LED claims wall-plug-efficiency record
LED applications will be key drivers for bulk GaN market, predicts Yole
Endoscopic measurement method allows quieter, more reliable jet engines
December 21, 2014
A team of scientists from German aerospace research centre DLR has developed an optical measurement method that enables direct ...
Pathway to converting sunlight to electricity is indentified
How industrial IoT will drive the MEMS market indirectly
Successful with phones & drones, Parrot ponders farming
Qimonda's late legacy: 28nm FeRAM
Volvo airs cloud-based cyclist protection system
December 19, 2014
The facts are disturbing: 50 percent of all cyclists killed in Europe's traffic have collided with a car. In Germany, the ...
Sony transforms eyewear into smart augmented reality devices
Harman grabs hidden infotainment gem S1nn
Alps Electric puts cash into Qualtre
- New life for Embedded systems in the Internet of Things
- Virtualization and the Internet of Things
- RF/Microwave Instrumentation “S” Series Amplifiers
- Application Guide to RF Coaxial Connectors and Cables
InterviewCEO interview: Bosch's IoT startup is all about the system
Thorsten Mueller, CEO of Bosch Connected Devices and Solutions GmbH (Reutlingen, Germany), has been guiding the latest startup subsidiary of Robert Bosch GmbH since 2013 when he started the initiative ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, Arrow Electronics is giving away ten BeMicro Max 10 FPGA evaluation boards together with an integrated USB-Blaster, each package being worth 90 Euros, for EETimes Europe's readers to win.
Designed to get you started with using an FPGA, the BeMicro Max 10 adopts Altera's non-volatile MAX 10 FPGA built on 55-nm flash process.
The MAX 10 FPGAs are claimed to revolutionize...MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.