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Aggregative Luminescence from CsPbBr3 Perovskite Precursors
Siwei Zhang1, Fulong Ma1, Jinhui Jiang1
1Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Kowloon, 999077, Hong Kong, P. R. China.
Investigating cesium lead bromide (CsPbBr3) precursors reveals aggregation-induced emission properties crucial for perovskite device performance. Understanding these photophysics aids in controlling crystallization and nucleation mechanisms.
Area of Science:
- Materials Science
- Photophysics
- Chemical Engineering
Background:
- Perovskite properties are vital for solution-processed device performance.
- Understanding precursor properties offers insight into crystallization and nucleation mechanisms.
Purpose of the Study:
- Investigate the photophysical properties of CsPbBr3 precursors.
- Explore concentration and solvent effects on precursor behavior.
- Understand aggregation-induced emission in CsPbBr3 precursors.
Main Methods:
- Detailed photophysical investigation of CsPbBr3 precursors.
- Analysis of precursor behavior across a range of concentrations and solvents.
- Characterization of adduct formation and luminescence properties.
Main Results:
- CsPbBr3 precursors exhibit aggregation-induced emission with increasing concentration.
- Luminescence originates from polybromide plumbous formed via solvent coordination.
- Two adducts (monodentate and bidentate) show distinct photoluminescence peaks at 610 nm and 565 nm.
- Luminescence intensity and color are tunable via solvent choice and precursor ratio.
Conclusions:
- Aggregation-induced emission in CsPbBr3 precursors is controllable.
- Ionic aggregates in precursors differ from molecular aggregates in organic systems.
- The developed fluorescence method can screen perovskite additives and assess precursor aging.
