Structural reconstruction synthesis of highly luminous water-stable CsPbBr3@CsPb2Br5@DSPE core-shell perovskite nanocrystals for bioimaging, pattering, and LEDs

doi:10.1016/j.jmst.2024.09.041

Abstract

Abstract: Lead halide perovskite (LHP) nanocrystals (NCs) suffer from poor stability against environmental factors (heat, moisture, oxygen, etc.), which seriously hinders their practical application. Constructing a core-shell structure could be an effective approach to improve the stability and optical properties of the LHP NCs. Herein, a novel strategy of water-triggered phase transformation and phospholipid (DSPE) micelle encapsulation is proposed, generating highly luminescent water-dispersed CsPbBr₃@CsPb₂Br₅@DSPE core-shell-shell nanocrystals. The epitaxial growth of the CsPb₂Br₅ shell is induced by the in-situ reconstruction of the CsPbBr₃ surface by water erosion, and the lattice mismatch with the CsPbBr₃ core is small (3.8 %). The further amphipathic phospholipid encapsulation guarantees their excellent water dispersity and stability. Revealed by the femtosecond transient absorption spectroscopy, the dense CsPb₂Br₅@DSPE shell effectively passivates the surface of the CsPbBr₃ core, thus improving its stability and luminescence performance. The resulting CsPbBr₃@CsPb₂Br₅@DSPE nanoparticles exhibit excellent performance as fluorescent probes for bioimaging, aqueous inks for high-resolution pattering, and light conversion layers for LEDs, demonstrating their promising potential in multiple applications.

Key words: Perovskite nanocrystals, Core-shell structure, Luminescent materials, LEDs

Jiejun Ren, Longyun Liu, Fan Liu, Huiping Liu, Xiaopeng Zhou, Gen Li, Liangjun Chen, Guoping Yan, Yuhua Wang. Structural reconstruction synthesis of highly luminous water-stable CsPbBr₃@CsPb₂Br₅@DSPE core-shell perovskite nanocrystals for bioimaging, pattering, and LEDs[J]. J. Mater. Sci. Technol., 2025, 222: 182-194.

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Structural reconstruction synthesis of highly luminous water-stable CsPbBr₃@CsPb₂Br₅@DSPE core-shell perovskite nanocrystals for bioimaging, pattering, and LEDs

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