Novel strategy: Fabrication of phosphor-in-glass via modulation of glass composition for dynamic laser illumination

All-inorganic phosphor-in-glass (PiG) materials for laser-induced luminescent devices have emerged as an irresistible trend in the solid-state lighting field, owing to their remarkable advantages such as easy fabrication, excellent light quality and low-cost. Unfortunately, the unstable output light quality under high power conditions remains an inevitable issue for PiGs. Herein, we presented a highly transparent Ce:YAG-PiG with an irradiation-resistant glass matrix, which was achieved by combining Li2Si2O5 and beta-spodumene to optimize the glass composition. Driven by a static 3.4 W blue laser excitation, the Ce:YAG-PiG possessing an exceptional thermal conductivity (2.1 W/(m<middle dot>K)), demonstrated a satisfactory steady-state luminous flux of 639.1 lm and achieving a remarkable luminous efficiency up to 247.8 lm/W. To mitigate the impact of "thermal quenching" caused by thermal saturation, an effectively implemented high-speed rotating colour wheel laser illumination module with heat dissipation capabilities has been adopted. This combination mode relatively stable colour coordinates across various power levels and the emitted light exhibits excellent collimation. Under the irradiation of a 190 W high-power laser, it can achieve a maximum luminous flux exceeding 18,000 lm. This research provides a novel guiding direction for the development of phosphor composite materials as well as the future applications of PiG materials.