Dean's Distinguished Lectures

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CEMSE Dean's Distinguished Lecture | Laser Lighting & Displays: The Next Revolution in Laser Diodes

Start Date: June 4, 2015
End Date: June 4, 2015


By Prof. Steven DenBaars (University of California, Santa Barbara)

InGaN based materials have been used to fabricate blue LDs which has lead to the realization of many applications such as blu-ray DVD, laser display, and now affords even high-efficiency white solid-state lighting.  Using a novel combination of GaN laser diodes and YAG:Ce crystals we have fabricated advanced GaN white light structures which exhibit luminous efficacy greater than 83 lm/Watt. We have fabricated novel GaN Laser Diode structures grown by MOCVD on semipolar orientations of bulk GaN that have shown remarkable efficiencies with EQE greater than 43% at high current densities(>20kA/cm2), with minimal efficiency droop. The GaN lasers exhibit slope efficiencies of greater than 1.35W/A, 49% differential efficiency, and greater than 2.2Watts of peak power. Further improvements in materials quality and cost reduction are necessary for wide-spread adoption of LDs for lighting.  We believe that solid-state laser lighting has the potential to achieve 85% energy efficiency, corresponding to 255 lm/watt, which would lead to revolutionary new white lighting sources.  This work supported in part by the Solid State Lighting an Energy Electronics Center and the KACST-KAUST-UCSB Solid State Lighting Program (SSLP).

Biography:  Dr. DenBaars is a Professor of Materials and Co-Director of the Solid-State Lighting Center at UC Santa Barbara. Professor DenBaars joined UCSB in 1991 and currently holds the Mitsubishi Chemical Chair in Solid State Lighting and Displays.  Specific research interests include growth of wide-band gap semiconductors (GaN based), and their application to Blue LEDs and lasers and energy efficient solid state lighting. This research has lead to over 759 scientific publications and over 168 U.S. patents on electronic materials and devices. He has been awarded a NSF Young Investigator award, Young Scientist Award of the ISCS, is an IEEE Fellow, IEEE Aron Kressel Award(w/ Prof. James Speck), Visiting Professor of the Institute for Advanced Studies (IAS) HKUST, and recently elected to the National Academy of Engineering(2012),and elected Fellow of the National Academy of Inventors (2014).

More Information:

For more info contactProf. Boon Ooi (

Date: Thursday 4th June 2015
Time: 11:00am - 12:00pm
Location: Building 9, Lecture Hall I Room 2322
The lecture will be followed by a light lunch​