期刊
ADVANCED MATERIALS
卷 30, 期 39, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201804137
关键词
all-solution process; charge balance; formamidinium-based perovskite light-emitting diodes; subgap electroluminescence; ZnO nanoparticles
类别
资金
- National Key Basic Research and Development Program of China (973 program) [2015CB655004]
- National Key Research and Development Program of China [2016YFB0401400]
- National Nature Science Foundation of China [51573056]
- Science and Technology Project of Guangdong Province [2017A010101020]
All-solution-processed pure formamidinium-based perovskite light-emitting diodes (PeLEDs) with record performance are successfully realized. It is found that the FAPbBr(3) device is hole dominant. To achieve charge carrier balance, on the anode side, PEDOT:PSS 8000 is employed as the hole injection layer, replacing PEDOT:PSS 4083 to suppress the hole current. On the cathode side, the solution-processed ZnO nanoparticle (NP) is used as the electron injection layer in regular PeLEDs to improve the electron current. With the smallest ZnO NPs (2.9 nm) as electron injection layer (EIL), the solution-processed PeLED exhibits a highest forward viewing power efficiency of 22.3 lm W-1, a peak current efficiency of 21.3 cd A(-1), and an external quantum efficiency of 4.66%. The maximum brightness reaches a record 1.09 x 10(5) cd m(-2). A record lifetime T-50 of 436 s is achieved at the initial brightness of 10 000 cd m(-2). Not only do PEDOT:PSS 8000 HIL and ZnO NPs EIL modulate the injected charge carriers to reach charge balance, but also they prevent the exciton quenching at the interface between the charge injection layer and the light emission layer. The subbandgap turn-on voltage is attributed to Auger-assisted energy up-conversion process.
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