Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 124, Issue 51, Pages 28277-28284Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.0c08769
Keywords
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Funding
- National Natural Science Foundation of China [61722504, 61675086, 61935009, 51772123]
- National Key Research and Development Program of China [2017YFB0403601]
- Science and Technology Development Program of Jilin Province [20190101016JH, 20200401059GX]
- Special Project of the Province-University Co-constructing Program of Jilin University [SXGJXX2017-3]
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Improved device performance of perovskite light-emitting diodes (LEDs) is demonstrated through the synergistic effect of the optimized CsPbI3 nanocrystals (NCs) as the emissive layer (EML) and ZnO/C-60 bilayer as electron transport layers (ETLs). The optical characteristics of the CsPbI3 NCs were optimized by strictly controlling the feeding ratio of Cs:Pb:I to 1:1:3 in the synthesis processes of NCs, which leads to enhanced photoluminescence quantum yields (PL QY) from 65% to 92%. Additionally, the introduction of C-60 not only optimized the energy level structure of the device, leading to more balanced charge injection and transport, but also smoothed the surface of the ZnO film and perovskite NCs. Consequently, a peak external quantum efficiency (EQE) of 10.7% and maximum luminance of 1377 cd m(-2) were achieved.
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