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Suppressing Strong Exciton–Phonon Coupling in Blue Perovskite Nanoplatelet Solids by Binary Systems
Author(s) -
Peng Shaomin,
Wei Qi,
Wang Bingzhe,
Zhang Zhipeng,
Yang Hongcheng,
Pang Guotao,
Wang Kai,
Xing Guichuan,
Sun Xiao Wei,
Tang Zikang
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202009193
Subject(s) - phonon , exciton , delocalized electron , materials science , picosecond , perovskite (structure) , coupling (piping) , condensed matter physics , chemical physics , binary number , optoelectronics , physics , chemistry , optics , crystallography , laser , arithmetic , mathematics , metallurgy , quantum mechanics
Abstract 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 Förster resonance energy transfer (FRET) efficiently competes with the exciton–phonon interactions in the binary system.