Rapid sintering of high-efficiency phosphor-in-glass films for laser-driven light source

Pengfei Wang, Hang Lin (), Guoxin Chen, Weitong Weng, Yue Xu, Yi Lin, Ju Xu, Yao Cheng and Yuansheng Wang ()
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Pengfei Wang: Chinese Academy of Sciences
Hang Lin: Chinese Academy of Sciences
Guoxin Chen: Chinese Academy of Sciences
Weitong Weng: Chinese Academy of Sciences
Yue Xu: Chinese Academy of Sciences
Yi Lin: Chinese Academy of Sciences
Ju Xu: Chinese Academy of Sciences
Yao Cheng: Chinese Academy of Sciences
Yuansheng Wang: Chinese Academy of Sciences

Nature Communications, 2025, vol. 16, issue 1, 1-12

Abstract: Abstract The development of advanced high-power-density laser-driven light source requires durable and color-tunable inorganic phosphor-in-glass film composites as color converter. One challenge remains for the phosphor-in-glass film is the thermal erosion and degradation of phosphor, as harsh condition or long duration time is required to densify the film for conventional sintering. Here we develop a rapid thermal annealing technique that achieves high film densification (porosity 10 kW) infrared irradiation. As demonstrated by high-resolution electron microscopy observation, a trivial interfacial reaction occurs, leading to almost intact phosphor particles and thus restrained luminous loss. For instance, the red-emitting Sr0.8Ca0.2AlSiN3:Eu2+ exhibits a record internal quantum efficiency of 91.2% in the processed film and achieves a luminous flux of 2379 lm and efficacy of 140 lm W−1 after fabricating a phosphor wheel. This method reduces energy consumption, enables high-throughput screening, and offers material universality and design flexibility, paving the way for new opto-functional materials and applications.

Date: 2025
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DOI: 10.1038/s41467-025-58099-5

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