Journal Article

PUBDB-2026-01571

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Synthesis-Dependent Fluorescence Properties of CsPbBr$_2$ Cl Supercrystals

Thalwitzer, R.Extern* ; Leis, W. ; Carter, R.Extern* ; Chulanova, E.Extern* ; Lapkin, D.Extern*XFEL.EU*DESY* ; Hinsley, G.Extern*DESY* ; Wang, B.XFEL.EU*DESY* ; Ngoi, K. H.Extern* ; Rysov, R.XFEL.EU*DESY* ; Westermeier, F.XFEL.EU*DESY* ; Vartanyants, I. A.Extern*XFEL.EU*DESY* ; Zaluzhnyy, I. A.Extern* ; Schreiber, F.Extern* ; Scheele, M. (Corresponding author)Extern*

2026
American Chemical Society Washington, DC

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Please use a persistent id in citations: doi:10.1021/acs.chemmater.5c03393  doi:10.3204/PUBDB-2026-01571

Abstract: We compare the fluorescence properties of CsPbBr2Cl nanocrystals, obtained via two distinct synthetic procedures and self-assembled into supercrystals using the same antisolvent crystallization technique. By spatially resolved fluorescence (lifetime) measurements we demonstrate that the optical properties of the supercrystals depend on the specific synthesis conditions of the constituting nanocrystals. Using scanning electron microscopy, small-angle X-ray scattering, and nuclear magnetic resonance spectroscopy, we find evidence that spatial fluctuations in the supercrystal fluorescence correlate with the ligand sphere of the nanocrystals. Specifically, homogeneous surface passivation of the nanocrystals leads to consistent interparticle distances and increased structural order within the supercrystals, resulting in a uniform fluorescence center wavelength and lifetime. The results of this study emphasize the importance of the relationship between crystalline structure and ligand configuration in controlling the optical properties of lead halide perovskite supercrystals.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. FS-Photon Science (FS-PS)
3. Experimentebetreuung PETRA III (FS-PET-S)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. FS-Proposal: I-20220813 (I-20220813) (I-20220813)
4. DFG project G:(GEPRIS)546072194 - Erhöhung von struktureller Kohärenz und optischem Koppeln in Superkristallen aus Nanopartikeln (546072194) (546072194)

Experiment(s):

1. PETRA Beamline P10 (PETRA III)

Appears in the scientific report 2026

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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