量子点
材料科学
光致发光
二极管
钙钛矿(结构)
制作
纳米晶
发光二极管
光电子学
量子效率
卤化物
胶体
纳米技术
纳米颗粒
降水
化学工程
无机化学
化学
工程类
病理
气象学
物理
医学
替代医学
作者
Hailong Huang,Fangchao Zhao,Lige Liu,Feng Zhang,Xian‐gang Wu,Lijie Shi,Bingsuo Zou,Qibing Pei,Haizheng Zhong
标识
DOI:10.1021/acsami.5b10373
摘要
We report a facile nonaqueous emulsion synthesis of colloidal halide perovskite quantum dots by controlled addition of a demulsifier into an emulsion of precursors. The size of resulting CH3NH3PbBr3 quantum dots can be tuned from 2 to 8 nm by varying the amount of demulsifier. Moreover, this emulsion synthesis also allows the purification of these quantum dots by precipitation from the colloidal solution and obtains solid-state powder which can be redissolved for thin film coating and device fabrication. The photoluminescence quantum yields of the quantum dots is generally in the range of 80–92%, and can be well-preserved after purification (∼80%). Green light-emitting diodes fabricated comprising a spin-cast layer of the colloidal CH3NH3PbBr3 quantum dots exhibited maximum current efficiency of 4.5 cd/A, power efficiency of 3.5 lm/W, and external quantum efficiency of 1.1%. This provides an alternative route toward high efficient solution-processed perovskite-based light-emitting diodes. In addition, the emulsion synthesis is versatile and can be extended for the fabrication of inorganic halide perovskite colloidal CsPbBr3 nanocrystals.
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