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All‐Inorganic CsCu 2 I 3 Single Crystal with High‐PLQY (≈15.7%) Intrinsic White‐Light Emission via Strongly Localized 1D Excitonic Recombination
Author(s) -
Lin Richeng,
Guo Quanlin,
Zhu Qun,
Zhu Yanming,
Zheng Wei,
Huang Feng
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201905079
Subject(s) - materials science , recombination , single crystal , exciton , white light , photoluminescence , optoelectronics , crystallography , photochemistry , condensed matter physics , physics , chemistry , biochemistry , gene
Energy‐saving white lighting from the efficient intrinsic emission of semiconductors is considered as a next‐generation lighting source. Currently, white‐light emission can be composited with a blue light‐emitting diode and yellow phosphor. However, this solution has an inevitable light loss, which makes the improvement of the energy utilization efficiency more difficult. To deal with this problem, intrinsic white‐light emission (IWE) in a single solid material gives a possibility. Here, an all‐inorganic lead‐free CsCu 2 I 3 perovskite single crystal (SC) with stable and high photoluminescence quantum yield (≈15.7%) IWE through strongly localized 1D exciton recombination is synthesized. In the CsCu 2 I 3 , the Cu–I octahedron, which provides most of electron states, is isolated by Cs atoms in two directions to form a 1D electronic structure, resulting a high radiation recombination rate of excitons. With this electronic structure design, the CsCu 2 I 3 SCs have great potential in energy‐saving white lighting.