Professor, Inventor and Entrepreneur with a demonstrated history of working in the higher education and startup industry. Strong education, professional skills in Compound Semiconductor(GaN,GaAs,InP, AlGaInP, ZnO) Research and Development (R&D), Semiconductors, Materials Science, and Physics of LEDs, Lasers, RF and Power Transistors. Over 190 issued U.S patents and 1160 peer reviewed publications in materials science and engineering. Member of the National Academy of Engineering, Fellow of National Academy of Inventors, and IEEE. Supervised over 50 PhD graduates, and co-founded 4 companies in the photonics and electronics fields.
The developments of high performance InGaN based RGB micro-light-emitting diodes (µLEDs) are discussed. Through novel epitaxial growth and processing, and transparent packaging we have achieved external quantum efficiencies as high as 58% EQE at 450nm for microLEDs. Recently, we have demonstrated efficient microLEDs emitting in the blue, green and red at dimensions as small of 1 micron. Using strain relaxation methods we have also extending the wavelength range of the InGaN alloys as into the red with emission as long as 640nm. Red InGaN based red MicroLEDs with efficiencies of 6% has been fabricated, and they display superior temperature performance in comparison to AlGaInP based devices.