Design of laser-driven high-efficiency Al2O3/YAG:Ce3+ ceramic converter for automotive lighting: Fabrication, luminous emittance, and tunable color space

An Al2O3/Y3Al5O12:Ce3+ ceramic phosphor plate (CPP) for which a nano-phosphor is used for a high-power laser diode (LD) application for white automotive-lighting is reported here. The prepared CPP shows improved luminous properties that are owing to the light propagation of the hexagonal α-Al2O3 in the CPP. The amount of α-Al2O3 added to the Y3Al5O12:Ce3+ CPP was optimized, and its impact on the luminous characteristics was investigated. The luminous properties of the Al2O3/Y3Al5O12:Ce3+ CPP are improved when compared with the Y3Al5O12:Ce3+ CPP, and the luminous emittance, as well as the conversion efficiency, is therefore also improved. The results of the present study indicate that the Al2O3/Y3Al5O12:Ce3+ CPP can serve as a potential material for the solid-state laser lighting in automotive applications.