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Understanding Excitonic Behavior in Light Absorption and Recombination Process
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-11-13 , DOI: 10.1021/acs.jpcc.0c09334 Bolin Guo 1, 2 , Chao Luo 1 , Cheng Yan 1 , Bai Sun 2 , Wen Li 1 , Weiqing Yang 1
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-11-13 , DOI: 10.1021/acs.jpcc.0c09334 Bolin Guo 1, 2 , Chao Luo 1 , Cheng Yan 1 , Bai Sun 2 , Wen Li 1 , Weiqing Yang 1
Affiliation
Understanding excitonic behavior in light absorption and recombination process is urgently needed to regulate luminescent properties of two-dimensional (2D) perovskite; however, such information is still unexplored. Here, first, we demonstrate that pure phenethylamine lead bromine (PEA2PbBr4) nanosheets (NSs) possess strong exciton absorption and emission spectrum with high exciton binding energy (up to 310 meV) and prove that free excitons (FEs) play a decisive role in the optical transition process. Then, we design Cd-doped PEA2PbBr4 NSs to induce self-trapped excitons (STEs). Doping with isoelectric Cd naturally induces an impurity-driven lattice distortion and a strong exciton–phonon coupling, resulting in the STEs broadband extrinsic luminescence spectra. Further, the corresponding exciton fluorescent components of FEs and STEs can be effectively distinguished from the emission spectrum through spectral line-shape analysis, revealing the synergistic effect of exciton states in the recombination process. Unambiguously, this work will provide a deeper understanding of the exciton behavior and look forward to regulating exciton composition to obtain ideal luminescence properties.
中文翻译:
了解光吸收和复合过程中的激子行为
迫切需要了解光吸收和复合过程中的激子行为,以调节二维(2D)钙钛矿的发光特性。但是,此类信息仍未开发。在这里,首先,我们证明纯苯乙胺铅溴(PEA 2 PbBr 4)纳米片(NSs)具有强大的激子吸收和发射光谱,具有高的激子结合能(高达310 meV),并证明了自由激子(FEs)起决定性作用在光学过渡过程中的作用。然后,我们设计Cd掺杂的PEA 2 PbBr 4NS诱导自陷激子(STE)。用等电镉掺杂自然会引起杂质驱动的晶格畸变和强激子-声子耦合,从而产生STEs宽带非本征发光光谱。此外,通过谱线形状分析,可以有效地将FE和STE的相应激子荧光成分与发射光谱区分开,从而揭示了激子态在重组过程中的协同效应。毫无疑问,这项工作将提供对激子行为的更深入的了解,并期待调节激子的组成以获得理想的发光性能。
更新日期:2020-11-26
中文翻译:
了解光吸收和复合过程中的激子行为
迫切需要了解光吸收和复合过程中的激子行为,以调节二维(2D)钙钛矿的发光特性。但是,此类信息仍未开发。在这里,首先,我们证明纯苯乙胺铅溴(PEA 2 PbBr 4)纳米片(NSs)具有强大的激子吸收和发射光谱,具有高的激子结合能(高达310 meV),并证明了自由激子(FEs)起决定性作用在光学过渡过程中的作用。然后,我们设计Cd掺杂的PEA 2 PbBr 4NS诱导自陷激子(STE)。用等电镉掺杂自然会引起杂质驱动的晶格畸变和强激子-声子耦合,从而产生STEs宽带非本征发光光谱。此外,通过谱线形状分析,可以有效地将FE和STE的相应激子荧光成分与发射光谱区分开,从而揭示了激子态在重组过程中的协同效应。毫无疑问,这项工作将提供对激子行为的更深入的了解,并期待调节激子的组成以获得理想的发光性能。