Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 12, Issue 26, Pages 6165-6173Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c01592
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Funding
- Natural Science Foundation of Hebei Province [F2019202252, F2019202294]
- Foundation of Hebei Education Department [BJ2021017]
- Graduate Innovation Foundation of Hebei Province [CXZZSS2021044]
- National Natural Science Foundation of China [61774154, 51902082, 61975256, 51973280, 11904323, 62035013, 61675057, 61975050]
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology [EERI_PI2020008]
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An efficient bilateral interfacial defect passivation strategy was demonstrated for high-performance PeLEDs based on thermally deposited CsPbBr3, which significantly suppressed nonradiative defects and balanced charge injection effectively, resulting in PeLEDs with high luminance, current efficiency, external quantum efficiency, and lifetime.
Physical vapor deposition has emerged as a promising strategy for efficient and stable all-inorganic perovskite light-emitting devices (PeLEDs). However, the thermally evaporated PeLEDs still suffer from unsatisfactory optoelectrical performance because of the massive nonradiative defects. Herein, we demonstrate an efficient bilateral interfacial defectpassivation strategy toward high-performance PeLEDs with a thermally deposited CsPbBr3 emissive layer (EML). Specifically, the nonradiative defects from the bulk as well as the EML/charge transport layer (CTL) interface are significantly suppressed by implementing the 3-amino-1-propanol (3AP)-modified PEDOT:PSS and introducing ammonium salts, respectively. Simultaneously, both the 3AP induced less- conductive Cs4PbBr6 and ammonium salts can balance the charge injection into the EML effectively. As a result, we achieved efficient PeLEDs based on thermally evaporated CsPbBr3 with a luminance of 15745 cd/m(2), current efficiency of 32 cd/A, external quantum efficiency of 8.86%, and lifetime of 3.74 h. The strategy proposed here may shed light on the development of highly efficient thermally evaporated PeLEDs.
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