The design of a ceramic phosphor plate with functional materials for application in high power LEDs

Abstract

Here we report the design of a ceramic phosphor plate made up of different functional materials, such as SiO₂ and MgO, and Lu₃Al₅O₁₂:Ce³⁺ (LuAG:Ce) for the fabrication of remote phosphors in high-power LED applications. Remote phosphors can be applied directly to LEDs for thermal dissipation. The amounts of SiO₂ and MgO were controlled to optimize the photoluminescence (PL) intensities. The addition of MgO was more effective, and the optimized content of MgO was between 5 and 5.5 wt%. Ceramic phosphor plates with MgO showed better properties than others with regard to thermal stability, performance degradation and CIE colour coordinate changes. MgO is expected to be an effective functional material for the fabrication of ceramic phosphor plates.