Laser phosphor projection sources enable a cost effective way to generate high light flux, since they take advantage of the recent cost down of blue laser diodes and do not need to use expensive green and red lasers. The primary colors are e.g. generated by blue laser diode illuminating a phosphor wheel to create yellow light. The yellow light is subsequently split into green and red light by means of e.g. a dichroic filter. With increasing light flux standard phosphor wheels that are based on a phosphor embedded in silicone, degrade at high peak temperatures. Wheels with a ceramic phosphor have a much higher temperature stability and offer a significant improvement. This paper discusses the requirements on optical materials used for digital projection.
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