期刊
ADVANCED FUNCTIONAL MATERIALS
卷 30, 期 48, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202005990
关键词
halide perovskite nanowires; light-emitting diodes; scalable synthesis; ultralow trap density
类别
资金
- National Natural Science Foundation of China [51961135107, 51774034, 11704015]
- National Key Research and Development Program of China [2017YFE0119700, 2016YFB0700700]
- National Natural Science Fund for Innovative Research Groups [51621003]
- Beijing Natural Science Foundation [2182039]
Bright red emission (620-650 nm) from perovskite light-emitting diodes (PeLEDs) is usually achieved via a composition including both bromine and iodine anions, which results in poor performance and stability due to phase separation under operating conditions. Here a large-scale ligand-assisted reprecipitation method is devised with nonpolar solvent that enables the fabrication of CsPbI(3)nanowire clusters, emitting at 600 nm. The blue-shift of this emission relative to that of bulk CsPbI3(approximate to 700 nm) is attributed to quantum confinement in nanowires. The growth of the nanowires is along the [011] crystal direction and is vacancy driven, resulting in the healing of surface defects and thereby a high photoluminescence quantum yield of 91%. The clusters with ultralow trap density show remarkable structural and environmental stability. PeLEDs based on these clusters exhibit an external quantum efficiency of 6.2% with Commission Internationale de l'Eclairage coordinates of (0.66, 0.34), and record luminance of 13 644 cd m(-2)of red electroluminescence. The half-lifetime under an accelerated stability test is 13.5 min for an unencapsulated device in ambient conditions operating at an initial luminance of 11 500 cd m(-2), which corresponds to an estimated half-lifetime of 694 h at 100 cd m(-2)based on acceleration factor obtained by experimental testing.
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