Stable CsPbBr₃‐Glass Nanocomposite for Low‐Étendue Wide‐Color‐Gamut Laser‐Driven Projection Display

Abstract Up‐to‐date laser‐driven projection technology puts an urgent demand for green phosphor with stringent requirements on its performance. Herein, by virtue of a new architecture design based on CsPbBr 3 ‐glass nanocomposite, i.e., CsPbBr 3 glass ceramic film sintered on sapphire plate, the application availability of this famous green‐emitting phosphor is demonstrated in laser‐driven projection. The mono‐dispersed perovskite CsPbBr 3 nanostructure in amorphous glass matrix and the negligible thermal corrosion during co‐sintering with low‐melting‐glass ensure good luminescent properties. The robust glass host and the carried sapphire substrate with high thermal conductivity contribute to good resistances to thermal shock, moisture, and blue laser irradiation. It is revealed that the thermal accumulation effect is relieved due to the pulsed excitation of rotatory “phosphor wheel,” and so the luminescence saturation threshold gets increased. The constructed prototype lighting source yields a low étendue of ≈0.41 mm 2 , a wide color gamut of 128.4% NTSC (95.9% Rec. 2020), and a moderate luminous flux of 174 lm. The present work highlights an unprecedented design that makes the seemingly impossible application of CsPbBr 3 come true.

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