High-Efficiency Solution-Processed Inorganic Metal Halide Perovskite Light-Emitting Diodes

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This paper reports highly bright and efficient CsPbBr3 perovskite light-emitting diodes (PeLEDs) fabricated by simple one-step spin-coating of uniform CsPbBr3 polycrystalline layers on a self-organized buffer hole injection layer and stoichiometry-controlled CsPbBr3 precursor solutions with an optimized concentration. The PeLEDs have maximum current efficiency of 5.39 cd A(-1) and maximum luminance of 13752 cd m(-2). This paper also investigates the origin of current hysteresis, which can be ascribed to migration of Br-anions. Temperature dependence of the electroluminescence (EL) spectrum is measured and the origins of decreased spectrum area, spectral blue-shift, and linewidth broadening are analyzed systematically with the activation energies, and are related with Br-anion migration, thermal dissociation of excitons, thermal expansion, and electron-phonon interaction. This work provides simple ways to improve the efficiency and brightness of all-inorganic polycrystalline PeLEDs and improves understanding of temperature-dependent ion migration and EL properties in inorganic PeLEDs.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2017-08
Language
English
Article Type
Article
Citation

ADVANCED MATERIALS, v.29, no.31

ISSN
0935-9648
DOI
10.1002/adma.201700579
URI
http://hdl.handle.net/10203/281288
Appears in Collection
MS-Journal Papers(저널논문)
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