期刊
ADVANCED OPTICAL MATERIALS
卷 6, 期 11, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201800220
关键词
electron transport layer; light-emitting diodes; nanocrystals; perovskites
资金
- National Research Foundation, Prime Minister's Office, Singapore [NRF-CRP14-2014-03, NRF-NRFI2016-08]
- Singapore Agency for Science, Technology and Research (A*STAR) SERC Pharos Program [152 73 00025]
- Singapore Ministry of Education through the Academic Research Fund [MOE2016-T2-1-054, Tier 1-RG105/16, Tier 1-RG92/15]
- China Scholarship Council [201608420137, [2016]3100]
Adopting proper electron transport layers (ETLs) is essential to high-performance all-inorganic perovskite light-emitting diodes (PeLEDs). However, the effect of ETLs has not been comprehensively investigated in all-inorganic nanocrystal PeLEDs, while 2,2',2 ''-(1,3,5-benzenetriyl) tris-[1-phenyl-1H-benzimidazole] (TPBi) is the most common ETL. Herein, a novel strategy is proposed to enhance the efficiency of nanocrystal PeLEDs. Tris(8-hydroxyquinoline) aluminum (Alq(3)) is incorporated into TPBi to form a new ETL TPBi/Alq(3)/TPBi, simultaneously enabling charge balance and confinement. The green PeLED with new ETL exhibits a maximum external quantum efficiency (EQE) of 1.43%, current efficiency of 4.69 cd A(-1), and power efficiency of 1.84 lm W-1, which are 191%, 192%, and 211% higher than those of PeLEDs with conventional ETL TPBi, respectively. Significantly, the EQE is 36-fold higher than that of PeLED with high electron mobility ETL. Impressively, the full width at half-maximum of electroluminescence emission is 16 nm, which is the narrowest among CsPbBr3 PeLEDs. The findings may present a rational strategy to enhance the device engineering of all-inorganic PeLEDs.
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