Issue 14, 2022

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

Abstract

Lead-halide perovskite nanocrystals (PeNCs) possess attractive linear and nonlinear optical properties. However, further adjusting their linear and nonlinear optical properties in a facile way remains a great challenge due to the inevitable instabilities. Herein, an effective host–guest system was successfully constructed by encapsulating PeNCs (CsPbX3 NCs) into a metal–organic framework (MOF), ZJU-28, via a sequential deposition method at ambient conditions. The accessible and charged frameworks of ZJU-28 facilitate the confinement growth of CsPbX3 NCs in the channels under a mild environment, and therefore facile halide-composition adjustment can be achieved by simply tuning the halide stoichiometry of CsX in a solution process, enabling wide-wavelength tunable one- and two-photon excited (1PE and 2PE) luminescence from 450 nm to 660 nm. Moreover, besides the confinement effect, effective separation, passivation and protection of CsPbX3 NCs are still achieved in ZJU-28⊃CsPbX3 crystals, resulting in a giant two-photon action cross-section which is comparable to that of colloidal CsPbX3 NCs densely capped by surface ligands, and significantly enhanced 1PE and 2PE photostability especially for the spectral stability of mixed-halide composites. These results will pave the way for the exploitation of highly stable and emission-tunable PeNCs composites in optoelectronic applications and even future integrated photonics.

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

Supplementary files

Article information

Article type
Paper
Submitted
07 jan 2022
Accepted
02 mar 2022
First published
02 mar 2022

J. Mater. Chem. C, 2022,10, 5550-5558

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

H. Wu, L. Yao, W. Cao, Y. Yang, Y. Cui, D. Yang and G. Qian, J. Mater. Chem. C, 2022, 10, 5550 DOI: 10.1039/D2TC00075J

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