发光二极管
材料科学
光电子学
光致发光
钙钛矿(结构)
量子点
量子产额
二极管
量子效率
荧光粉
发光
纳米技术
光学
化学工程
物理
工程类
荧光
作者
Shuai Yuan,Zhaokui Wang,Ming‐Peng Zhuo,Qi‐Sheng Tian,Yan Jin,Liang‐Sheng Liao
出处
期刊:ACS Nano
[American Chemical Society]
日期:2018-09-10
卷期号:12 (9): 9541-9548
被引量:144
标识
DOI:10.1021/acsnano.8b05185
摘要
Full inorganic cesium lead halide perovskites (IOPs) are regarded as attractive candidates for light-emitting diodes (LEDs) by their excellent luminescent conversion. However, unsatisfactory efficiency and stability are still the main drawbacks that hinder the commercialization progress of perovskite LEDs (PeLEDs). Here, we report an extremely uniform and flat CsPbBr3 film composing of self-assembly core–shell structured quantum dots (SCQDs) based on one-step precursor coating. The QDs size in the CsPbBr3 film is around 4.5 nm (smaller than the Bohr radius), which significantly confines injected carriers and leads to a ultrahigh exciton binding energy (Eb) of 198 meV. In addition, unfavorable surfacial defects are dramatically passivated by a thin surfacial-capping layer composed of long-chain ammonium groups (phenylalanine bromide, PPABr), resulting in an ultralow nonradiative recombination rate. Consequently, the CsPbBr3 SCQDs film presents a high photoluminescence quantum yield (PLQY) of 85%. It enables the resulting green PeLEDs to deliver a recorded external quantum efficiency (EQE) over 15% with ideal operational stability. Furthermore, the developed CsPbBr3 SCQDs film also demonstrates promising potential in multifunctional lighting sources such as flexible and smart devices.
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