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Li ZG, Dong XH, Song HP, Huang SS, Hu H, Li W, Yu MH, Even J, Bu XH. Broadband Emission Induced by Band-Edge Carrier Reconfiguration in 2D Hybrid Lead Halide Perovskites. Small Methods 2024:e2301662. [PMID: 38634221 DOI: 10.1002/smtd.202301662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 02/15/2024] [Indexed: 04/19/2024]
Abstract
Broadband emission in hybrid lead halide perovskites (LHPs) has gained significant attention due to its potential applications in optoelectronic devices. The origin of this broadband emission is primarily attributed to the interactions between electrons and phonons. Most investigations have focused on the impact of structural characteristics of LHPs on broadband emission, while neglecting the role of electronic mobility. In this work, the study investigates the electronic origins of broadband emission in a family of 2D LHPs. Through spectroscopic experiments and density functional theory calculations, the study unveils that the electronic states of the organic ligands with conjugate effect in LHPs can extend to the band edges. These band-edge carriers are no longer localized only within the inorganic layers, leading to electronic coupling with molecular states in the barrier and giving rise to additional interactions with phonon modes, thereby resulting in broadband emission. The high-pressure photoluminescence measurements and theoretical calculations reveal that hydrostatic pressure can induce the reconfiguration of band-edge states of charge carriers, leading to different types of band alignment and achieving macroscopic control of carrier dynamics. The findings can provide valuable guidance for targeted synthesis of LHPs with broadband emission and corresponding design of state-of-the-art optoelectronic devices.
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Affiliation(s)
- Zhi-Gang Li
- Tianjin Key Laboratory of Metal and Molecule-Based Material Chemistry, School of Materials Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Xiao-Hui Dong
- Key Laboratory of Industrial Microbiology, Ministry of Education and Tianjin City, College of Biotechnology, Tianjin University of Science and Technology, Tianjin, 300450, China
| | - Hai-Peng Song
- State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China
| | - Shi-Shuang Huang
- Tianjin Key Laboratory of Metal and Molecule-Based Material Chemistry, School of Materials Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Huan Hu
- Tianjin Key Laboratory of Metal and Molecule-Based Material Chemistry, School of Materials Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Wei Li
- Tianjin Key Laboratory of Metal and Molecule-Based Material Chemistry, School of Materials Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Mei-Hui Yu
- Tianjin Key Laboratory of Metal and Molecule-Based Material Chemistry, School of Materials Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Jacky Even
- Univ Rennes, INSA Rennes, CNRS, Institut FOTON, UMR 6082, Rennes, F-35000, France
| | - Xian-He Bu
- Tianjin Key Laboratory of Metal and Molecule-Based Material Chemistry, School of Materials Science and Engineering, Nankai University, Tianjin, 300350, China
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