Mn⁴⁺‐Activated Robust Red‐Emitting PiG for Laser‐Driven Display

Laser phosphor display is an emerging display technology with high brightness and wide color gamut, wherein the red light is currently converted by K 2 SiF 6 : Mn 4+ or perovskite quantum dots phosphors that, however, show poor chemical stability and low quenching temperature even dispersed in glass for resistance of high‐density laser irradiation. In this work, a robust red‐emitting Mg 14 (0.75Ge,0.25Ti) 5 O 24 : Mn 4+ , B 3+ (MGTOB: Mn 4+ ) phosphor is developed, and its phosphor‐in‐glass (PiG) film is prepared on a sapphire substrate. Microstructure and spectral characterization show that the glass component has a negligible erosive effect on MGTOB: Mn 4+ phosphor. The PiG film also exhibits excellent thermal quenching resistance, with the thermal quenching temperature reaches 673 K (400 °C). The application potential of the MGTOB: Mn 4+ /β‐SiAlON:Eu 2+ PiG film in laser projectors is demonstrated, showing a wide color gamut of 108.2% NTSC compared to a commercial YAG:Ce 3+ converted LED projector. The results indicate that the new red‐emitting PiG film is a highly promising laser‐driven color converter.