Journal
ADVANCED MATERIALS
Volume 31, Issue 46, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201905079
Keywords
1D localization; all-inorganic perovskites; excitonic recombination; lead free; white lighting
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Funding
- National Natural Science Foundation of China [61604178, 91333207, U1505252, 91833301]
- China Postdoctoral Science Foundation [2018M643305]
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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 CsCu2I3 perovskite single crystal (SC) with stable and high photoluminescence quantum yield (approximate to 15.7%) IWE through strongly localized 1D exciton recombination is synthesized. In the CsCu2I3, 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 CsCu2I3 SCs have great potential in energy-saving white lighting.
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