All-solid in-situ synthesis of BN-stabilizing CsPbBr3 QD phosphors for holographic imaging

Metal halide perovskite quantum dots (QDs) are considered a new generation of emitters for lighting, but their practical application is hindered by the Joule heating-induced performance deterioration during operation. Here, we present a narrow-band light source made of CsPbBr 3 (CPB) QD phosphors for potential application in holographic imaging for the first time. The thermally stable CPB/BN composite phosphors were prepared via a solvent-free mechanochemical strategy employing a high-speed multifunction grinder. The QD phosphors achieve a photoluminescence quantum yield (PLQY) exceeding 80 %, because the high surface area of h-BN matrix can suppress the QD aggregation-induced PL quenching. Importantly, the high thermal conductivity of h-BN enables the efficient dissipation of Joule heating generated during device operation, and CPB/BN composites retain 79 % of the initial emission intensity at 100 °C, outperforming the 33 % retention observed in pure CPB QDs. The CPB/BN green LEDs demonstrate the capability of holographic imaging, achieving a spatial resolution of 64 lp/mm, superior to 40 lp/mm of commercial β-sialon green light sources. This work substantially enhances the stability of perovskite QD and pioneers its application in holographic imaging, accelerating the future applications in 3D display, AR, VR, and related fields.