High‐Performance Phosphor‐in‐Glass Film on Thermoelectric Generator for Non‐Radiative Energy Recycling in Laser Lighting
Yang Peng, Jiuzhou Zhao, Zikang Yu, Qing Wang, Jiaxin Liu, Mingxiang Chen, Yun Mou
Abstract
Abstract Huge heat energy is ultimately generated in the color converter as a result of the nonradiative recombination of high‐power laser excitation. Inspired by the thermoelectric conversion, a high‐performance phosphor‐in‐glass film (PIGF) coated on a thermoelectric generator (TEG) for nonradiative energy recycling in high‐brightness laser lighting is proposed. The heat‐resistance PIGF with high luminescence is tightly coated on the hot‐side ceramic of TEG, while yielding a bright white light and promoting the heat conduction between PIGF and TEG. At the PIGF thickness of 60 µm, the PIGF‐TEG enables a natural white light with a luminous flux of 464 lm, a luminous efficacy of 194 lm W −1 , a correlated color temperature (CCT) of 6552 K, and an appropriate chromaticity coordinate of (0.3117, 0.3302) under a laser power of 2.39 W. Aside from the high‐brightness output white light with a luminous flux of 1045 lm, the laser‐driven PIGF‐TEG produces the output voltage and current of 0.46 V and 174 mA under a laser power of 5.61 W, respectively. Therefore, the proposed PIGF‐TEG provides a potential strategy for heat energy recycling in high‐power phosphor‐converted lighting.