期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 8, 期 29, 页码 9986-9992出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tc02062a
关键词
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资金
- State Key Laboratory of Luminescence and Applications [SKLA-2019-07]
- Natural Science Foundation of Hebei Province [F2019202252, F2019202294]
- National Natural Science Foundation of China [61774154, 51672068, 51902082]
- Jilin Province Science and Technology Research Project [20180201029GX]
- Natural Science Foundation of Tianjin [17JCYBJC41500]
- China Postdoctoral Science Foundation [2019M653808XB]
- 2018 Guangxi Post-Doctoral Innovative Talent Support Program
Controlling the nucleation process and forming small nanograins, as well as passivating defects at grain boundaries as the grain size becomes smaller, in one-step solution formed polycrystalline halide perovskites are of great importance for achieving efficient perovskite light-emitting diodes (PeLEDs). Here, a crown ether, 2-hydroxymethyl-12-crown-4 (HM12C4), is adopted as an additive and its influence on the photophysical and electroluminescent properties of a PeLED was investigated. It is found that HM12C4 can not only suppress PbBr(6)octahedron agglomeration in the precursor but also improve the wettability of the hole transport layer, resulting in a smoother dense perovskite film with smaller polycrystallites. Moreover, the retained HM12C4 in the perovskite film effectively passivated the defects at the grain boundaries and improved the photophysical and electroluminescent properties. Consequently, significantly enhanced electroluminescent performance was achieved with a low turn-on voltage of 2.3 V, a current efficiency of 17.2 cd A(-1), and an external quantum efficiency of 4.52%. Our findings reveal that crown ethers have great potential in exploiting high-performance PeLED, with significant implications for the further development of PeLEDs.
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