Projects per year
Abstract
The rapid emergence of gallium-nitride (GaN) light-emitting diodes (LEDs) for solid-state lighting has created a timely opportunity for optical communications using visible light. One important challenge to address this opportunity is to extend the wavelength coverage of GaN LEDs without compromising their modulation properties. Here, a hybrid source for emission at 540 nm consisting of a 450 nm GaN micro-sized LED (micro-LED) with a micron-thick ZnCdSe/ZnCdMgSe multi-quantum-well color-converting membrane is reported. The membrane is liquid-capillary-bonded directly onto the sapphire window of the micro-LED for full hybridization. At an injection current of 100 mA, the color-converted power was found to be 37 μW. At this same current, the −3 dB optical modulation bandwidth of the bare GaN and hybrid micro-LEDs were 79 and 51 MHz, respectively. The intrinsic bandwidth of the color-converting membrane was found to be power-density independent over the range of the micro-LED operation at 145 MHz, which corresponds to a mean carrier lifetime of 1.9 ns.
Original language | English |
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Article number | 035012 |
Number of pages | 7 |
Journal | Semiconductor Science and Technology |
Volume | 30 |
Issue number | 3 |
Early online date | 27 Jan 2015 |
DOIs | |
Publication status | Published - Mar 2015 |
Keywords
- gallium-nitride
- light-emitting diodes
- GaN
- GaN LED
- hybrid micro-LED
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Projects
- 2 Finished
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Ultra-Parallel Visible Light Communications (UP-VLC)
Dawson, M. (Principal Investigator), Calvez, S. (Co-investigator) & Watson, I. (Co-investigator)
EPSRC (Engineering and Physical Sciences Research Council)
1/10/12 → 28/02/17
Project: Research
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Ultra-Precision Optical Engineering With Short-Wavelength Semiconductor Disk Laser Technology (Challenging Engineering)
Hastie, J. (Principal Investigator)
EPSRC (Engineering and Physical Sciences Research Council)
1/05/11 → 30/04/16
Project: Research
Prizes
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EPSRC Challenging Engineering award winner 2011
Hastie, J. (Recipient), 2011
Prize: Prize (including medals and awards)