Abstract

The two-phase $\mathrm{Mg}{\mathrm{Al}}_2{\mathrm{O}}_4\text{-}\mathrm{Ce}\text{:}\mathrm{YAG}$ ceramic phosphor was fabricated by the solid-state reaction in vacuum, and it presented a better luminous efficacy than the single-phase transparent ceramic phosphor when directly combined with the blue light-emitting diodes. The addition of $\mathrm{Mg}{\mathrm{Al}}_2{\mathrm{O}}_4$ implemented the control of the grain sizes and the variation of microstructure, and the microstructure optimization further improved the luminous efficacy of the composite phase ceramic phosphor. A maximum luminous efficacy attaining 99 lm/W at the correlated color temperature 5000 K was obtained. The composite phase ceramic phosphor is expected to be a promising candidate for use in the high-power light source.

© 2015 Optical Society of America

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