Phosphor-free white: the prospects for green direct emitters

Christian Wetzel; Theeradetch Detchprohm

doi:10.1117/12.899259

22 September 2011 Phosphor-free white: the prospects for green direct emitters

Christian Wetzel, Theeradetch Detchprohm

Proceedings Volume 8123, Eleventh International Conference on Solid State Lighting; 812308 (2011) https://doi.org/10.1117/12.899259
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

Abstract

Energy efficiency has been the primary driving force for solid state lighting to replace wasteful incandescent lamps by light emitting diodes (LEDs). Recently, rising cost for rare earth metals has redoubled the push to also replace fluorescent and compact fluorescent lighting. Phosphors in fluorescent lamps heavily rely on rare earth metals and even first generation LEDs use such phosphors, albeit at much lower quantities. The role of phosphors to expand a narrow wavelength source into a wider spectrum is a very lossy process in itself and can be circumvented altogether by second generation LEDs, where the full visible solar spectrum is directly replicated by direct emitting LEDs. We here report progress of our work towards this goal, in particular by the development of high brightness direct emitting green group- III nitride LEDs.

Citation Download Citation

Christian Wetzel and Theeradetch Detchprohm "Phosphor-free white: the prospects for green direct emitters", Proc. SPIE 8123, Eleventh International Conference on Solid State Lighting, 812308 (22 September 2011); https://doi.org/10.1117/12.899259

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