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
Cutting down on personal data leaks
August 22, 2014
Now may be the right time to cut down on smartphone data leaks and reclaim a little bit of privacy, according to Yves-Alexandre ...
Great chances and risks for sensor industry in shale gas exploration
Tools out of the 3D printer conquer car production
Trinamic's stepper motor package gets you started
Webinar: Printed circuit board test and in line automation
Apple, Samsung tablet sales decline
August 21, 2014
Global tablet shipments grew 5 percent year on year to reach 52.4 million units in 2Q14, according to market analysis company ...
MCU market on a rebound, says analyst
Is free-space wireless charging viable? Dialog thinks itís worth a try
Schaeffler to boost electromobility by Formula E commitment
- Building Blocks for the Internet of Things
- New Linear Regulators Solve Old Problems
- Testing GPS with a Simulator
- DSM presents: Select the best plastic for DDR4
InterviewCEO interview: Tronics' Langlois makes moves in MEMS
Pascal Langlois has been CEO at Tronics for nine months. He discusses plans for the company and directions for the complex and diverse MEMS technology sector.
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, Altium Ltd is offering EETimes Europe's readers the chance to win one TASKING VX-Toolset for ARM Cortex-M Premium Edition, normally licensed for 2.395 Euros, for ultra-rapid prototyping and code development around ARM Cortex-M based microcontrollers.
The VX-toolset for ARM is the first TASKING compiler suite to receive the Software Platform technology, which is seamlessly...Read more
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.