Thermal and optical performance investigations of laser-excited phosphor layer on a semiconductor chilling plate

High-power laser illumination is considered as one of the most potential method for the next generation of lighting. However, heat accumulation greatly influences the optical performance of the phosphor converted layer, which is bottleneck of the high-power laser illumination system. In this study, a semiconductor chilling plate (SCP) with water cooling system was adopted to dissipate heat accumulated by phosphor convertor during the high-power blue laser excitation. Input laser power and the power of SCP were experimentally evaluated. The thermal and optical performances were also evaluated, respectively. As a result, the phosphor layer with a SCP showed better heat dissipation than the phosphor layer without a SCP. When the system was in the optimizing SCP substrate temperature (5°C), the highest input laser power that the phosphor layer with a SCP can sustain is 4.82W, which is 62.23% higher than the phosphor layer without a SCP (2.97W). Therefore, the phosphor layer with a SCP shows great potential in high-power laser illumination system.