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Illuminating Lead Coordination in Perovskite Precursors via Fluorescence Spectroscopy
Author(s) -
Zhang Siwei,
Wang Jinjin,
Jiang Jinhui,
Ma Fulong,
Wang Yifan,
Chen Xinmeng,
Kwok Ryan T. K.,
Zhao Zheng,
Lam Jacky W. Y.,
Tang Ben Zhong
Publication year - 2025
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202500294
Subject(s) - photoluminescence , perovskite (structure) , halide , nucleation , fluorescence , spectroscopy , quantum yield , octahedron , luminescence , fluorescence spectroscopy , chemistry , coordination complex , chemical physics , full width at half maximum , photochemistry , materials science , inorganic chemistry , crystallography , crystal structure , metal , optoelectronics , optics , organic chemistry , physics , quantum mechanics
Abstract The properties of perovskite precursors critically determine the ultimate performance of perovskite devices, yet simple and accessible real‐time precursor characterization methods remain scarce. Here, we systematically investigate the lead (Pb) coordination environment in perovskite precursors using fluorescence spectroscopy. By examining lead halide [PbX 6 ] 4− octahedra (X═Cl, Br, I) and monitoring their luminescence under different solvents and A‐site cation compositions, we unveil how [PbX 6 ] 4− distinct aggregation states give rise to characteristic fluorescence “fingerprints.” We find that halide choice, solvent coordination, and A‐site cations collectively exert pronounced effects on the photoluminescence (PL) peak positions, full width at half maximum (FWHM), and photoluminescence quantum yield (PLQY). Moreover, we demonstrate that fluorescence spectroscopy can capture subtle changes in intermediate perovskite structures—including low‐dimensional nanoscale clusters and the formation of higher‐dimensional networks. This robust optical method offers a powerful and straightforward approach for tracing the nucleation stage, evaluating solvent–solute and solute–solute interactions, and differentiating Pb coordination states in real time. The aggregation‐induced emission (AIE) phenomenon of inorganic systems and the structure‐activity relationship at the aggregate level have important guiding significance for the design of materials.