Transparent Ceramic-Quantum Dots Glass Film Composites with High-Efficiency Thermal Management for Laser-Driven Projection Display

Although blue laser-excited phosphor-in-glass films (PiGFs) have been extensively investigated for laser-driven display applications, their performance is still constrained due to a broad red emitting spectrum and thermal management challenges, etc. To overcome these limitations, this study develops a novel composite architecture – YAG: Ce transparent ceramic-CsPbBr 1.5 I 1.5 quantum dots (CPBI QDs) in glass film enhanced with h-BN (YAG: Ce TC-QiGF BN). YAG: Ce TC acts as a high thermal conductivity substrate and yellow light component, while QiGF enables to produce narrowband red emission. The h-BN particles are dispersed within QiGF, where a significant portion of them accumulate around the CPBI QDs powders. The inclusion of h-BN significantly improves both light extraction efficiency and thermal conductivity, leading to an increase of blue-light absorption efficiency from 57.74% to 69.26% and mitigation of heat accumulation induced by high-power laser irradiation. Among the three designed prototype projection display systems (YAG: Ce TC, YAG: Ce TC- CASN: Eu PiGF, and YAG: Ce TC-QiGF BN), the YAG: Ce TC-QiGF BN-based configuration demonstrates the most effective red-light enhancement and superior color rendering performance, particularly exhibiting the purest red color due to its narrowband emission feature. This innovative material holds considerable potential for the next-generation laser-driven displays.