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

Abstract

All‐inorganic perovskite (CsPbX3, 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, a new one‐step strategy for encapsulating CsPbX3 NCs with porous zeolite via the hot injection method is explored. By altering the mole ratio of PbX2, the emission wavelength of CsPbX3@zeolite is found to be regularly modulated from blue‐emission (CsPbCl2Br@zeolite, 436 nm) to red‐emission (CsPbBrI2@zeolite, 648 nm), thus enabling full spectrum adjustment. Due to the surface passivation of zeolite to CsPbX3 NCs, CsPbX3@zeolite possess an outstanding quantum yield and display excellent thermal/photo/air stability. Subsequently, white light‐emitting diodes based on green‐CsPbBr3@zeolite and red‐CsPbBrI2@zeolite are constructed and applied to the backlit display, achieving a wide color gamut of 134.2% for NTSC 1953 and 99.8% for Rec. 2020. The CsPbX3@zeolite implanted with a polymethyl methacrylate film is used to realize upconversion emission under an 800 nm laser at room temperature. Furthermore, amplified spontaneous radiation based on CsPbBr3@zeolite films is achieved. These results convincingly indicate broad application prospects for CsPbX3@zeolite prepared via this simple method.

Stable and wide-wavelength tunable luminescence of CsPbX3 nanocrystals encapsulated in metal–organic frameworks

“…CsPbX 3 NCs have been successfully stabilized in glass via a conventional melt-quenching technique, or in zeolites via a modified hot-injection method, both of which enable full spectrum adjustment of up-conversion luminescence. 28,29 However, the ultrahigh temperature is indispensable in the melt-quenching technique and tedious conditions such as heating and a nitrogen atmosphere are highly required in the hot-injection method. Recent intriguing porous materials, metalorganic frameworks (MOFs), have been demonstrated to be multifunctional platforms for the successful incorporation of dye molecules, carbon dots and even nanoparticles, owing to their high porosity, tunable pores/channels and specific sites.…”

Stabilizing red-emitting all-inorganic perovskite nanocrystals by a ligand-mediated room-temperature procedure

“…The full width at half maximum (FWHM) of the PL for the various samples ranged from 34 to 40 nm (see Table S1 in the ESI †), which is a bit higher than that of halide-mixed CsPbBr 3−x I x NCs synthesized at high temperature. [26][27][28] The XRD patterns reported in Fig. 1d indicate that the main diffraction peaks of all the CsPbBr 3−x I x NCs match neither the crystal planes of pure CsPbI 3 nor the planes of pure CsPbBr 3 .…”

Stable CsPbX3 (X = Cl, Br, I) Nanocrystal‐in‐Glass Composite (NGC) for Solid‐State Laser‐Driven White Light Generation

“…To improve the stability of perovskite nanocrystals, many strategies have been proposed, which mainly includes the following three types: 1) compositional modification; [16][17][18] 2) surface treatment; [19,20] and 3) matrix encapsulation. [21][22][23][24] Among these methods, matrix encapsulation that coating a compact and passivated matrix on the perovskite nanocrystals to isolate them away from the external environment is considered a direct and efficient pathway to improve both the thermal and chemical stability of perovskite nanocrystals. Although great efforts have been devoted to perovskite-polymer composites, most of the organic binders suffer poor thermal stability and yellow aging.…”