Narrow-band green/red-emitting glass composites enabling highly stable patterned wheel for laser phosphor display
Laser phosphor display (LPD) technology has attained considerable attention due to its high brightness, wide-gamut, and non-speckle characters. However, it is challenging to develop laser-resistant bulk luminescent materials with narrow-band emissions for LPD applications. Herein, we present a general strategy to fabricate stable phosphor-glass composites (PGCs) containing commercial red-emitting K 2 SiF 6 :Mn 4+ (KSF:Mn 4+ ) and green-emitting β -SiAlON:Eu 2+ with high internal quantum efficiencies of 94.6% and 87.8%. Thereupon, “phosphor wheels” of the two PGCs achieve high luminous flux and efficiency for KSF:Mn-PGC (684 lm, 21 lm W −1 mm −1 ) and β -SiAlON:Eu-PGC (4770 lm, 172 lm W −1 mm −1 ), respectively, by mitigating thermal accumulation. Finally, we integrate these two PGCs into a patterned phosphor wheel, which covers 125% of the Rec. 709 standard, far exceeding that of the present YAG:Ce-based laser light sources (103%). Our work paves the way for adapting commercial phosphors in bulk PGC materials to improve their stability and further promote LPD development and new types of display applications.
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