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

Chen Chen; Lei Nie; Yizhe Huang; Shuang Xi; Xingyue Liu; Xiwen Zhang; Tielin Shi; Guanglan Liao; Shiyuan Liu; Zirong Tang

doi:10.1088/1361-6528/ac4b2d

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

Nanotechnology. 2022 Feb 3;33(17). doi: 10.1088/1361-6528/ac4b2d.

Authors

Affiliations

¹ School of Mechanical Engineering, Hubei University of Technology, Wuhan 430068, People's Republic of China.
² School of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing 210037, People's Republic of China.
³ State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology (HUST), Wuhan 430074, People's Republic of China.

PMID: 35026737
DOI: 10.1088/1361-6528/ac4b2d

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 thein situconfined growth, which is attributed to the re-nucleation of water-triggered phase transformation from Cs₄PbBr₆to 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.

Keywords: Cesium lead halide; Metal-organic frameworks; White light-emitting diode; embedded growth; perovskite nanocrystals.