Narrow-Band Green-Emitting β-SiAlON:Eu2+ for Wide-Color-Gamut Laser-Driven Projection Displays

Laser-driven projection displays promise a large screen size, high brightness, and speckle-free, but are greatly limited by the “green gap” and low color gamut. To address these issues, much narrower-band and high-efficiency green converters are required. In this work, we synthesized green-emitting β-Si 5.97 Al 0.03 O 0.03 N 7.97 :Eu 2+ with an emission maximum of 527 nm, full width at half maximum of 42.95 nm, and external quantum efficiency of 41.4%, by using NaF additives to eliminate the lattice oxygen. By co-sintering it with glass frits on an aluminum substrate to fabricate phosphor-in-glass films at 430°C for 20 min, which inherit the excellent luminescence and stability of phosphor without detectable interfacial reactions. The optimized PiG film-coated phosphor wheel was prepared to eliminate thermal effects, and showed outstanding laser irradiation resistance, reaching a luminous flux of 3849.43 lm @32.53 W mm −2 and a luminous efficacy of 101.46 lm W −1 . The advanced laser phosphor display prototype achieves a color gamut as high as 90.92% Rec.2020. These results demonstrate the strong potential of the β-Si 5.97 Al 0.03 O 0.03 N 7.97 :Eu 2+ phosphor for accelerating the advancement of laser-driven projection displays technology.