Journal
NANOMATERIALS
Volume 12, Issue 23, Pages -Publisher
MDPI
DOI: 10.3390/nano12234300
Keywords
transient absorption spectroscopy; reversible charge transfer; lead-free double perovskite; conjugated polymer; nanocomposites
Categories
Funding
- National Natural Science Foundation of China (NSFC)
- China Postdoctoral Science Foundation
- Applied Basic Research Program in Shanxi Province
- Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi
- Linfen Key Research and Development Program
- Graduate Innovation Project in Shanxi Province
- [61805134]
- [11974229]
- [2022M711898]
- [201801D221016]
- [202103021223254]
- [2020L0235]
- [2021L257]
- [2028]
- [2022Y498]
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This study investigates the photoinduced charge transfer between lead-free Mn-doped Cs2NaIn0.75Bi0.25Cl6 double perovskite nanocrystals and conjugated polymers. The reversible charge transfer is found to be tunable by varying the excitation photon-energy.
Combining steady-state photoluminescence and transient absorption (TA) spectroscopy, we have investigated the photoinduced charge transfer dynamics between lead-free Mn-doped Cs2NaIn0.75Bi0.25Cl6 double perovskite (DP) nanocrystals (NCs) and conjugated poly[2-methoxy-5-(3 ',7 '-dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV). Upon ultraviolet-A excitation, the photoinduced absorption feature of DP NCs/MDMO-PPV nanocomposites disappeared, and the stimulated emission weakened in the TA spectrum. This was due to charge transfer from the MDMO-PPV polymers to DP NCs. Upon a higher photon-energy ultraviolet-C excitation, stimulated emission and photoinduced absorption features vanished, indicating there existed a reversible charge transfer from DP NCs to MDMO-PPV polymers. Reversible charge transfer of Mn-doped DP NCs/MDMO-PPV nanocomposites was tuned by varying the excitation photon-energy. The manipulation of reversible charge transfer dynamics in the perovskite-polymer nanocomposites opens a new avenue for optical and optoelectronic applications.
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