[7p-A414-1~17] 13.9 Optical properties and light-emitting devices

▲ [7p-A414-8] Preparation and Luminescent Properties of YAG/Al₂O₃ Composites Phosphors Ceramics

〇Rong-Jun Xie¹, Shuxing Li², Yujin Cho¹, Takashi Takeda¹, Naoto Hirosaki¹ (1.NIMS, 2.Xiamen Univ.)

Keywords:phosphor, ceramic, laser lighting

Laser-driven solid state lighting is a newly emerged technology that enables to produce high-power and super-brightness white light by combining a blue laser diode (LD) with a yellow luminescent material. The color converter, as one of the key components in laser lighting, must be thermally robust and luminescence efficient as it experiences high flux-density irradiation and thermal attack caused by the high power incident laser. In this work, we design a Al₂O₃-YAG:Ce phosphor ceramic with an unique composite structure, where yellow-emitting YAG:Ce particles are embedded in a thermally conductive Al₂O₃ matrix. When irradiated under a 444 nm blue laser, the phosphor ceramic with a thickness of 0.1 mm shows a linear relationship between the luminous flux and the input current under a high power density of 50 Wmm^-2, validating its suitability for high-brightness solid state laser lighting.