Efficient Energy Funneling in Quasi‐2D Perovskites: From Light Emission to Lasing

Quasi‐2D Ruddlesden–Popper halide perovskites with a large exciton binding energy, self‐assembled quantum wells, and high quantum yield draw attention for optoelectronic device applications. Thin films of these quasi‐2D perovskites consist of a mixture of domains having different dimensionality, all...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2020-04, Vol.32 (16), p.e1906571-n/a
Main Authors: Lei, Lei, Seyitliyev, Dovletgeldi, Stuard, Samuel, Mendes, Juliana, Dong, Qi, Fu, Xiangyu, Chen, Yi‐An, He, Siliang, Yi, Xueping, Zhu, Liping, Chang, Chih‐Hao, Ade, Harald, Gundogdu, Kenan, So, Franky
Format: Article
Language:English
Subjects:
amplified spontaneous emission
Crystal structure
Current carriers
Distributed feedback lasers
Domains
energy funneling
Energy gap
Energy transfer
Excitons
Light emission
light‐emitting diodes
Materials science
Morphology
Nanocrystals
Optoelectronic devices
Perovskites
Quantum wells
quasi‐2D perovskites
Spontaneous emission
Thin films
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Summary:Quasi‐2D Ruddlesden–Popper halide perovskites with a large exciton binding energy, self‐assembled quantum wells, and high quantum yield draw attention for optoelectronic device applications. Thin films of these quasi‐2D perovskites consist of a mixture of domains having different dimensionality, allowing energy funneling from lower‐dimensional nanosheets (high‐bandgap domains) to 3D nanocrystals (low‐bandgap domains). High‐quality quasi‐2D perovskite (PEA)2(FA)3Pb4Br13 films are fabricated by solution engineering. Grazing‐incidence wide‐angle X‐ray scattering measurements are conducted to study the crystal orientation, and transient absorption spectroscopy measurements are conducted to study the charge‐carrier dynamics. These data show that highly oriented 2D crystal films have a faster energy transfer from the high‐bandgap domains to the low‐bandgap domains (
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.201906571