Journal
ADVANCED MATERIALS INTERFACES
Volume 8, Issue 13, Pages -Publisher
WILEY
DOI: 10.1002/admi.202100442
Keywords
light-emitting diodes; moisture durability; octylammonium sulfate; photoluminescence quantum yield; quasi-2D perovskite
Funding
- NSFC [52011530432, 51872240, 51911530212, 51902263]
- Natural Science Foundation of Shaanxi Province [2020JQ-158]
- seed Foundation of Innovation and Creation for Graduate Students in Northwestern Polytechnical University [CX2020072]
- Fundamental Research Funds for the Central Universities [31020180QD131, 3102019JC005, 3102019ghxm004]
- Department of Science & Technology of Shaanxi Province [2020GXLH-Z-018]
- Northwestern Polytechnical University [2020GXLH-Z-018]
- 1000 Youth Talent Program of China
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Quasi-2D perovskite shows excellent luminescence properties for PeLEDs, but water-induced lattice degradation and crystalline phase transition limit its application. Octylammonium sulfate decoration effectively enhances the moisture durability of perovskite film, reduces defect density, and enhances lattice stability, while also increasing photoluminescence quantum yield. Furthermore, the generated PbSO4 improves carrier transport and injection balance, resulting in enhanced operational lifetime and maximum external quantum efficiency of PeLEDs.
Quasi-2D perovskite exhibits excellent luminescence properties for highly efficient perovskite light-emitting diodes (PeLEDs). However, the lattice degradation and crystalline phase transition induced by water limit the PeLED's development for application and commercialization. It is demonstrated that the organic additives effectively reduce the defect density, while the bonding strength of these organics and perovskite becomes weak under the high electric field and the Joule heat in an operating PeLED. Thus, an alternative additive for forming strong bonding with perovskite is promising to improve the stability of perovskite film and PeLEDs simultaneously. Here, it is shown that octylammonium sulfate decoration effectively enhances the moisture durability of PEA(2)(CsPbBr3)(4)PbBr4 quasi-2D perovskite film by generating PbSO4 on the surface. The strong bonding interaction of SO42- and Pb2+ ions leads to the reduced defect density, enhanced lattice stability, and robust photoluminescence quantum yield of perovskite film, which is confirmed by the density functional theory calculation. Moreover, the generated PbSO4 reduces the internal resistance and adjusts the band structure of perovskite film to enhance the carrier transport and injection balance. The PeLEDs based on PbSO4 decorated perovskite film exhibit enhanced operational lifetime and the maximum external quantum efficiency of 10.84%.
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