SKL Seminar - Recent Advances in III-Nitrides for MicroLED and Visible Laser Materials and Devices
The developments of high performance InGaN based RGB micro-light-emitting diodes (µLEDs) and Blue and Green Laser Diodes 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. The critical challenges of µLEDs, namely full-color scheme, decreasing pixel size and mass transfer technique, and their potential solutions are explored. Recently, we have demonstrated efficient microLEDs emitting in the blue to 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. Recently, we have employed novel ALD passivated deep recessed ridge etching and porous GaN to make novel blue and green laser diodes. Green laser diodes with emission wavelengths as long as 524nm have been achieved using novel porous GaN waveguides. This work was supported by the Solid State Lighting and Energy Electronics Center(SSLEEC) at UC Santa Barbara.
Steven DenBaars is a Distinguished Professor of Materials and Electrical and Computer Engineering, The Mitsubishi Chemical Professor in Solid State Lighting & Display, and Executive Director of the Solid State Lighting and Energy Electronics Center (SSLEEC) at the University of California, Santa Barbara. Professor DenBaars received his BS from the University of Arizona, MS and PhD from the University of Southern California(Advisor P.Daniel Dapkus). Professor DenBaars worked at Hewlett-Packard Optoelectronics in San Jose and Penang, Malaysia. Professor DenBaars joined the University of California, Santa Barbara faculty where he conducts research on wide-bandgap semiconductors (GaN based) and their application to Blue and UV LEDs, Laser Diodes, 5G Electronics, RF and high-power electronic devices. Professor DenBaars has co-founded 4 companies in compound semiconductors (Nitres, Soraa, SLD Laser, Akoustis). He is the recipient of the Quantum Device Award (2021), Aron Kressel Award, IEEE Photonics Society(2010) and IEEE Fellow(2008). He has published over 1200 peer reviewed publications(H-index of 151) and is the named inventor on 150 U.S. Patents. He is a Fellow of IEEE, Member of National Academy of Engineering, and Fellow of the National Academy of Inventors.