Integrating High Efficiency and Thermal Reliability Photoluminescence in Double-Sapphire-Sandwiched Phosphor-in-Glass Film for Laser Projection Displays

Laser projection display technology (LPDT), as next-generation visual system, has been prized for the ultrawide color gamut and operational stability. However, thermal degradation under laser irradiation and the scarcity of efficient narrow-band emitters are always challenging in LPDT. Herein, a double-sapphire-sandwiched phosphor-in-glass film (PiGF) based on commercial red-emitting K 2 SiF 6 :Mn 4+ and green-emitting β -SiAlON:Eu phosphors, is designed and prepared by a rapid sintering method. The as-prepared PiGF demo can achieve high luminous flux of 3765 and 1365 lm, respectively, and the ingenious cooperative rotating dynamic heat dissipation mechanism maintains temperatures at 60 °C even under 14 W mm −2 laser irradiations, thereby preventing degradation. Once being integrated into a multicolor phosphor wheel, it generates noncoherent white light covering 125% of the Rec.709 color standard representing an ultrawide color gamut. This work provides an advanced phosphor material platform enabling high-brightness, reliable LPDT for next-generation projectors and televisions.