Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 49, Pages 22156-22162Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202009193
Keywords
binary systems; blue-emissive perovskite nanoplatelets; CsPbBr3; energy transfer; exciton-phonon coupling
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Funding
- Macau Science and Technology Development Fund [FDCT-0044/2020/A1, FDCT-091/2017/A2, FDCT-014/2017/AMJ]
- University of Macau [SRG2016-00087-FST, MYRG2018-00148-IAPME, MYRG2018-00142-IAPME]
- Natural Science Foundation of China [91733302, 61935017]
- Natural Science Foundation of Guangdong Province, China [2019A1515012186]
- Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials [2019B121205002]
- High Level University Fund of Guangdong Province [G02236004]
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Quasi-two-dimensional (2D) perovskites are promising candidates for light generation owing to their high radiative rates. However, strong exciton-phonon interactions caused by mechanical softening of the surface act as a bottleneck in improving their suitability for a wide range of lighting and display applications. Moreover, it is not easily available to tune the phonon interactions in bulk films. Here, we adopt bottom-up fabricated blue emissive perovskite nanoplatelets (NPLs) as model systems to elucidate and as well as tune the phonon interactions via engineering of binary NPL solids. By optimizing component domains, the phonon coupling strength can be reduced by a factor of 2 driven by the delocalization of 2D excitons in out-of-plane orientations. It shows the picosecond energy transfer originated from the Forster resonance energy transfer (FRET) efficiently competes with the exciton-phonon interactions in the binary system.
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