Embedded growth of colorful CsPbX₃ (X = Cl, Br, I) nanocrystals in metal-organic frameworks at Room Temperature

Abstract

Herein, we develop a novel strategy for preparing all-inorganic cesium lead halide (CsPbX3, X= Cl, Br, I) perovskite nanocrystals (NCs)@Zn-based metal-organic framework (MOF) composites through interfacial synthesis. The successful embedding of fluorescent perovskite NCs in Zn-MOFs is due to the in-situ confined growth, which is attributed to the re-nucleation of water-triggered phase transformation from Cs4PbBr6 to CsPbBr3. The controllable synthesis of mixed-halide based composites with various emission wavelength can be achieved by adding the desired amount of halide (Cl or I) salts in the re-nucleation process. More importantly, the anion exchange reaction is inhibited among various composites with different halogen atoms by being trapped in MOFs. Besides, a white light-emitting diode (WLED) is produced using a blue LED chip with the green-emitting and red-emitting composites, which has a color coordinate of (0.3291, 0.3272) and a wide color gamut. This work provides a novel route to achieving perovskite NCs growth in MOFs, which also can be extended to the other NCs embedded in frames as well.

Shape-controlled synthesis of one-dimensional cesium lead halide perovskite nanocrystals: methods and advances

“…68,77,78 The mechanism of this transformation is that Cs 4 PbX 6 NCs in nonpolar solvent lose CsX at a nonpolar solvent/water interface owing to good solubility of CsX in water and thus convert into CsPbX 3 NCs. [79][80][81][82][83][84][85] Employing this principle, CsPbBr 3 NWs or NRs can be produced via direct or indirect transformation from Cs 4 PbX 6 NCs. 36,38,41,49,50 Zhang et al first applied this method and prepared ultrathin CsPbBr 3 NWs with a diameter of 2.5 nm and a length of up to 10 mm.…”

In situ formation of red perovskite nanocrystals for improved stability

“…At present, various materials are used to coat and protect perovskites, such as TiO2, [11,12] AlOX, [13] and MOF. [14,15] Polymer cladding is also commonly used to protect chalcogenides. [16] Another feasible method is to protect perovskite quantum dots with glass by glass embedding method.…”

Efficient red luminescence in Eu3+doped CdSe/CdS all-inorganic quantum dots shows great potential for wLEDs

“…[10][11][12] CsPbX 3 (X = Cl/Br/I) halide perovskite QDs in glass are widely studied inorganic QDs because of their high quantum yield, narrow FWHM, and tunable emission. 13,14 However, the low quantum efficacy (<14%) and transmittance (<10%) of the red halide perovskite QD glass (CsPbI 3 ) limit its application potential in wLED although the halide perovskite QDs with full emission color from blue to red have been achieved by adjusting the ratio of halide elements. 15,16 Even though great endeavors have been made and reported, the quantum efficiency of redemitting CsPbI 3 QDs could be partly improved by incorporating specic elements, such as uorine and Eu 3+ , into the QD glass matrix.…”