High brightness laser-driven white emitter for Etendue-limited applications

Appl Opt. 2017 Oct 20;56(30):8321-8325. doi: 10.1364/AO.56.008321.

Abstract

Laser-phosphor lighting has great potential because a laser diode (LD) could keep high efficiency under high current. Remote phosphor configuration has been studied, but a phosphor-covered LD has not been reported due to several difficulties. In the present work, we develop a novel laser-driven white emitter. Without remote phosphor configuration, the white emitter has a very simple structure, making it is easy for mass production and standardization. Under a continuous wave driving current of 3 A, it emits 850 lm with correlated color temperature of 6990 K. The wall-plug efficacy is 70 lm/W for the maximum. The laser-driven white emitter is very suitable for Etendue-limited applications due to its very small emitting size of 0.45 mm×0.2 mm.