期刊
ACS ENERGY LETTERS
卷 7, 期 1, 页码 453-460出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.1c02572
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资金
- National Natural Science Foundation [22075022, 21703008]
- Cultivate Creative Talents Project of Beijing Institute of Technology (BIT)
- King Abdullah University of Science and Technology (KAUST)
Research has shown that two-dimensional perovskites with similar crystal structures exhibit distinct emission mechanisms due to the enhanced electron-phonon coupling resulting from halogen substitution.
Low-dimensional organic-inorganic hybrid lead halides have opened up a new frontier in single-component phosphors for white emission, which stems from self-trapped excitons (STEs), where STE states are dependent on lattice deformation, involving interactions between an inorganic skeleton and organic cations to consequently affect electron-phonon coupling. Herein, to decouple the crystal structure dominator on emission mechanisms, we employ the protonated benzimidazole as organic cations to synthesize two 100-oriented two-dimensional (2D) perovskites with Br- or Cl- as halogen anions, separately. Interestingly, even with a similar single layered crystal structure that is almost distortion-free in an inorganic octahedral framework, the two as-synthesized perovskites show distinct emission mechanisms. The underlying halogen regulatory mechanism is unveiled. In addition to changing the lattice deformation energy and self-trapping energy of STEs, the halogen substitution results in a 10-fold enhancement in electron-phonon coupling that affects STE dynamics. Therefore, this suggests a general design principle to tailor electron-phonon coupling in low-dimensional perovskites for broadband white emission.
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