One‐Pot Synthesis of CsPbX3 (X = Cl, Br, I)@Zeolite: A Potential Material for Wide‐Color‐Gamut Backlit Displays and Upconversion Emission

• DOI: 10.1002/adom.202100012
• Publication Date: 2021-03-15T06:41:35Z
• Authors: Yao Tong; Qin Wang; Enrou Mei; Xiaojuan Liang; Wei Gao; Weidong Xiang
• Keywords: Backlight; Gamut; Quantum yield

Abstract All‐inorganic perovskite (CsPbX 3 , X = Cl, Br, I) nanocrystals (NCs) with promising optical properties are recognized as a rising star among photoelectric materials, but their inevitable instabilities limit extensive application. Herein, new one‐step strategy for encapsulating CsPbX NCs porous zeolite via the hot injection method is explored. By altering mole ratio of PbX 2 emission wavelength @zeolite found to be regularly modulated from blue‐emission (CsPbCl Br@zeolite, 436 nm) red‐emission (CsPbBrI @zeolite, 648 nm), thus enabling full spectrum adjustment. Due surface passivation NCs, possess an outstanding quantum yield and display excellent thermal/photo/air stability. Subsequently, white light‐emitting diodes based on green‐CsPbBr red‐CsPbBrI constructed applied backlit display, achieving wide color gamut 134.2% NTSC 1953 99.8% Rec. 2020. The implanted polymethyl methacrylate film used realize upconversion under 800 nm laser at room temperature. Furthermore, amplified spontaneous radiation CsPbBr films achieved. These results convincingly indicate broad application prospects prepared this simple method.