Effects of alkylamine chain length on perovskite nanocrystals after washing and perovskite light-emitting diodes
Effects of alkylamine chain length on perovskite nanocrystals after washing and perovskite light-emitting diodes
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DOI：
10.7567/1347-4065/ab4ecd
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发表时间：
2020-03-01
影响因子：
1.5
通讯作者：
Masuhara, Akito
中科院分区：
文献类型：
--
作者：
Tezuka, Yuki;Umemoto, Kazuki;Masuhara, Akito
有机-无机杂化卤化铅钙钛矿纳米晶(PeNC)作为钙钛矿型发光二极管(PeLED)的光源因其优异的光学性能而备受关注。然而，PeNC通常使用辛胺(OAM)作为具有绝缘性能的封端配体。探索一种理想的短烷基胺来替代OAM是改进PeLED的必要条件。在这里，作为解决这一问题的策略之一，研究了烷基胺链长对PENC的光学性质和派拉特性的影响。戊胺是一种理想的短烷基胺类化合物，可沉淀出PLQY高达90%的发光碳纳米管。重要的是，戊胺在旋涂后保持了相对较高的PLQY为48%，这是因为戊胺作为洗涤溶剂具有乙酸乙酯的耐用性。戊胺修饰的PeNC的外量子效率也超过1%，发光亮度超过2000cd cm(-2)，这表明戊胺具有克服PENC薄膜绝缘性的潜力。(C)2019年日本应用物理学会
Organic-inorganic hybrid lead halide perovskite nanocrystals (PeNCs) have received great attention as a light source for perovskite LEDs (PeLEDs) owing to the superior optical properties. However, PeNCs typically use octylamine (OAm) as capping ligands which have insulating properties. Exploring a desirable short alkylamine instead of OAm is required for the improvement of PeLEDs. Here, as one of the strategies to solve this issue, the effects of alkylamine chain length for optical properties of PeNCs and PeLED characteristics are investigated. Pentylamine is an optimal short alkylamine and precipitate luminescent PeNCs with high PLQY values of 90%. Importantly, pentylamine maintains a relatively high PLQY of 48% after spin-coating, due to the durability pentylamine has to ethyl acetate as a washing solvent. PeNCs capped with pentylamine also demonstrate an external quantum efficiency of over 1% with luminance of over 2000 cd cm(-2), indicating that pentylamine has the potential to overcome the insulator properties of PeNC thin film. (C) 2019 The Japan Society of Applied Physics