期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 22, 期 30, 页码 17299-17305出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cp02530e
关键词
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资金
- National Natural Science Foundation of China [21573229, 21873068, 21422309]
- Double First-Rate and Peiyang Scholar Projects (Tianjin University)
- State Key Laboratory of Bioelectronics (Southeast University)
- Frontier Science Project of the Knowledge Innovation Program of Chinese Academy of Sciences (CAS)
- Project for Excellent Member of CAS Youth Innovation Promotion Association
In this work, we introduced halogen-substituted chiral molecules as A-site cations to synthesize a series of novel organic-inorganic hybrid two-dimensional (2D) chiral perovskite materials (R-X-p-mBZA)(2)PbBr4(X = H, F, Cl, Br;p:para-position; mBZA = alpha-methylbenzylamine) for the first time. This halogen-substituted cation strategy collectively solved problems of narrow emission, weak chirality and low photoluminescence quantum yield (PLQY) for the emerged chiral perovskites. Photoluminescence (PL) spectra are significantly broadened due to the additional emission from self-trapped excitons (STEs) besides free excitons (FEs) states modulated by introducing significant disorder to the Pb-Br-Pb angle. The chirality of A-site chiral molecules is transferred and amplified to entire perovskite materials by fixing the chiral molecules at A-siteviathe interaction of halogen atoms. Furthermore, their PLQYs are improved with the reduction of energy gap and inhibition of the non-radiative transition from STEs to ground state. The halogen-substituted A-site cation strategy can be performed to develop organic-inorganic hybrid chiral perovskites with various optoelectronic applications.
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