TY - JOUR
T1 - Metal Coordination Sphere Deformation Induced Highly Stokes-Shifted, Ultra Broadband Emission in 2D Hybrid Lead-Bromide Perovskites and Investigation of Its Origin
AU - Febriansyah, Benny
AU - Borzda, Tetiana
AU - Cortecchia, Daniele
AU - Neutzner, Stefanie
AU - Folpini, Giulia
AU - Koh, Teck Ming
AU - Li, Yongxin
AU - Mathews, Nripan
AU - Petrozza, Annamaria
AU - England, Jason
N1 - Publisher Copyright:
© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2020/6/26
Y1 - 2020/6/26
N2 - Published studies of layered (2D) (100)-oriented hybrid lead-bromide perovskites evidence a correlation between increased inter-octahedral (Pb-Br-Pb) distortions and the appearance of broadband white light emission. However, the impact of distortions within their constituent [PbBr6]4− octahedra has yet to be assessed. Herein, we report two new (100)-oriented 2D Pb-Br perovskites, whose structures display unusually high intra-octahedral distortions, whilst retaining minimal inter-octahedral distortions. Using a combination of temperature-dependent, power-dependent and time-resolved photoluminescence spectroscopic measurements, we show that increased intra-octahedral distortion induces exciton localization processes and leads to formation of multiple photoinduced emissive colour centres. Ultimately, this leads to highly Stokes-shifted, ultrabroad white light emission at room temperature.
AB - Published studies of layered (2D) (100)-oriented hybrid lead-bromide perovskites evidence a correlation between increased inter-octahedral (Pb-Br-Pb) distortions and the appearance of broadband white light emission. However, the impact of distortions within their constituent [PbBr6]4− octahedra has yet to be assessed. Herein, we report two new (100)-oriented 2D Pb-Br perovskites, whose structures display unusually high intra-octahedral distortions, whilst retaining minimal inter-octahedral distortions. Using a combination of temperature-dependent, power-dependent and time-resolved photoluminescence spectroscopic measurements, we show that increased intra-octahedral distortion induces exciton localization processes and leads to formation of multiple photoinduced emissive colour centres. Ultimately, this leads to highly Stokes-shifted, ultrabroad white light emission at room temperature.
KW - crystal engineering
KW - intra-octahedral distortion
KW - lead-bromide perovskites
KW - photophysics
KW - white-light emission
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U2 - 10.1002/anie.201915708
DO - 10.1002/anie.201915708
M3 - Article
C2 - 32271981
AN - SCOPUS:85085120920
SN - 1433-7851
VL - 59
SP - 10791
EP - 10796
JO - Angewandte Chemie - International Edition
JF - Angewandte Chemie - International Edition
IS - 27
ER -