期刊
ORGANIC ELECTRONICS
卷 60, 期 -, 页码 64-70出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2018.05.034
关键词
Formamidinium lead bromide nanocrystals; Light-emitting diode; Concentration; Electroluminescence spectra; Recombination region
资金
- NSFC/China [51573065, 51727809]
- China Postdoctoral Science Foundation [2017M620321]
- science and technology support program of Hubei Province [2015BAA075]
- Analytical and Testing Centre at Huazhong University of Science and Technology
Formamidinium (FA) lead bromide (FAPbBr(3)) perovskite nanocrystals (P-NCs) have ultrapure green emission and high stability, while FAPbBr(3) NCs based light-emitting diodes (FA-NLEDs) still have little report. Here, FAPbBr(3) NCs with a high photoluminescence quantum yield of 85.8% were synthesized. By controlling the concentration of FAPbBr(3) NCs in toluene solution, the exciton recombination region was precisely confined to the emitting layer and the parasitic emission coming from electron transport layer disappeared, resulting in the pure green emissions. The optimized FA-NLED presents a maximum external quantum efficiency (EQE), current efficiency (CE) of 3.84% and 16.08 cd/A respectively, with the EL emission peak of 528 nm, CIE of (0.183, 0.763) and a full width of half-maximum (FWHM) of 24 nm, which is among the best performance of FA-NLEDs.
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