Composite phase ceramic phosphor of Al2O3-Ce:YAG for high efficiency light emitting

We present our achievement which is a ceramic plate phosphorable to produce white light when directly combined with commercially available blue light emitting diodes. The ceramic phase structure is that the Al2O3 particle is uniformly distributed in the Ce:YAG matrix. The Al2O3-Ce:YAG ceramic phosphor has a better luminous efficacy than the transparent Ce:YAG ceramic phosphor under the same test condition. The Al2O3 particle plays an important role in promoting the luminous efficacy. The Al2O3 particle changes the propagation of the light in ceramic, and it reduces the total internal reflection. That is why the composite phase ceramic phosphor improves extraction efficiency of light. (C) 2015 Optical Society of America