期刊
IEEE ELECTRON DEVICE LETTERS
卷 39, 期 4, 页码 520-523出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2018.2803082
关键词
Light-emitting diodes; modulation bandwidth; nonpolar gallium nitride; visible-light communication
资金
- U.S. Army Research Laboratory
- U.S. Army Research Office [W911NF-15-1-0428]
We demonstrate a high-speed nonpolar m-plane InGaN/GaN micro-scale light-emitting diode (LED) with a record electrical -3 dB modulation bandwidth of 1.5 GHz at a current density of 1 kA/cm(2). A differential carrier lifetime (DLT) of 200 ps at 1 kA/cm(2) was extracted using a rate-equation model. The short DLT is attributed to the high electron-hole wave function overlap in polarization-free nonpolar InGaN/GaN quantum wells, which leads to a higher spontaneous emission rate at low current densities compared to polar c-plane quantum wells. LEDs with improved high-speed performance at low current densities will help to reduce power dissipation and increase efficiency in Gb/s visible-light communication systems.
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