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
RS Components and Allied Electronics connect with Rosenberger for global distribution
October 24, 2014
RS Components (RS) and Allied Electronics, the trading brands of Electrocomponents plc, have signed a global distribution ...
Pixel chip sparks energy-efficient intelligent LED headlamps
Noise cancellation: The sounds of silence in the car
HPLEDs double light output, cut costs by 40 percent
Startup creates virtual cores
Photochemical compounds for tunable OLED devices
October 24, 2014
Spanish researchers have developed new organic compounds characterized by a higher modularity, stability and efficiency, ...
Consumer chips in the car? Experts demand adequate design processes
Murata cheerleaders demonstrate sensors, swarm intelligence
Radon and VOCs detection goes personal
- 5 Best Practices for Designing Flexible Test Stations
- Intelligent PLCs Expand the Internet of Things
- Solutions for Millimeter Wave Wireless Backhaul
- Enter Linduino
InterviewCEO interview: AMS' Laney on driving a sensor-driven business
Kirk Laney, CEO of Austrian mixed-signal chip and sensor company AMS, wants to leverage the opportunity that technology affords to create new markets for sensors and sensor interfaces.
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, Oscium is giving away three of its iMSO-204L dual analogue iOS oscilloscopes, worth USD400 each. Designed with native Lightning compatibility, the iMSO-204L transforms the iPad, iPhone, and iPod touch into an ultra-portable, two-channel oscilloscope.
Since Apple changed its connector, Oscium has been working to bring native compatibility to its customers. The third generation...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.