期刊
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
卷 13, 期 5, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssr.201800575
关键词
exciton quenching; modifying layer; quantum dot light-emitting devices; transient electroluminescence
资金
- National Natural Science Foundation of China [11674315]
- Science and Technology Innovation Foundation of Shenzhen [JCYJ20170817114726048]
In this study, the enhanced device performance of CuInS2/ZnS quantum dots-based light-emitting didoes (QLEDs) for photomedical applications using polyethylenimine ethoxylated (PEIE)-modified ZnO as electron transport layer has been reported. The device enhancement is investigated by applying time-resolved photoluminescence and transient electroluminescence spectra. The results show that the modification of PEIE on ZnO layer limits the electron injection into quantum dots layer and reduces the accumulation of electrons at ZnO/QD interface. This provides an effective way to suppress the charging processes of quantum dots and thus enhance the device efficiency. As a result, the synergistic effect of PEIE modifying layer leads to a record current efficiency of 2.75cdA(-1) for the CuInS2/ZnS-based QLEDs with deep red emission at 650nm.
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