Dual-Protective CsPbX<sub>3</sub> Perovskite Nanocomposites with Improved Stability for Upconverted Lasing and Backlight Displays
Qin Wang, Yao Tong, Hangtao Ye, Xiaojuan Liang, Keqin Yang, Weidong Xiang
Abstract
Recently, perovskite nanocrystals (NCs) have been recognized as a substitute for the conventional phosphor color converters, which can improve the color gamut and reproduction of liquid crystal displays (LCDs). However, the issue of instability has always been a stumbling block to practical applications. Here, a novel dual-phase mixed@glass@styrene–ethylene–butylene–styrene (SEBS) (MGS) nanocomposite is synthesized by three simple steps and the optimal photoluminescence quantum yield (PLQY) is 50%. Benefiting from the dual protection of the glass matrix and SEBS film re-encapsulation, the MGS composite shows typical bright green emission, significant improvement in water/thermal/photon resistance, and environmental friendliness. Moreover, combining the as-prepared red emitter and the green-emitting MGS film with a blue InGaN chip as the backlight, an efficient white light-emitting diode (wLED) for backlights is fabricated. The gamut of the prepared LCD covers 131 and 97.7% National Television System Committee (NTSC) 1953 and Rec. 2020, respectively. In addition, random upconverted laser emission is achieved by low-power two-photon pumping. Hence, the dual-protective composite material with exceptional stability provides a feasible path for backlight display and upconverted lasing.