Transparent Ce:Y_3AI_5O_(12) ceramic phosphors for white light-emitting diodes

摘要

We present our recent achievement of a transparent ceramic able to produce white light when directly combined with commercially available blue light emitting diodes. The photoluminescence properties of ceramic phosphor (Y_(1-x)Ce_x)_3Al_5O_(12) are studied as a function of doping fraction (x = 0.0005-0.0020). The emission color is tunable by variations of Ce~(3+) concentration and ceramic phosphor thickness. A maximum luminous efficacy exceeding 93 lm/W at a low correlated color temperature of ～4600 K is obtained, which is superior to samples made from commercial phosphor powders. Hence, the present transparent ceramic phosphor is expected to be an ideal candidate for generating white light.