High Color Purity and Efficient Green Light-Emitting Diode Using Perovskite Nanocrystals with the Size Overly Exceeding Bohr Exciton Diameter,Journal of the American Chemical Society

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High Color Purity and Efficient Green Light-Emitting Diode Using Perovskite Nanocrystals with the Size Overly Exceeding Bohr Exciton Diameter
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2021-11-12 , DOI: 10.1021/jacs.1c09948
Jun-Nan Yang _{1,

2} , Tian Chen _{1,

2} , Jing Ge _{1,

3} , Jing-Jing Wang _{1,

2} , Yi-Chen Yin _{1,

2} , Yi-Feng Lan _{1,

2} , Xue-Chen Ru _{1,

2} , Zhen-Yu Ma _{1,

2} , Qun Zhang _{1,

3} , Hong-Bin Yao _{1,

2}

Affiliation

Lead halide perovskite nanocrystals (PNCs) are emerging as promising light emitters to be actively explored for high color purity and efficient light-emitting diodes. However, the most reported lead halide perovskite nanocrystal light-emitting diodes (PNCLEDs) encountered issues of emission line width broadening and operation voltage elevating caused by the quantum confinement effect. Here, we report a new type of PNCLED using large-size CsPbBr₃ PNCs overly exceeding the Bohr exciton diameter, achieving ultranarrow emission line width and rapid brightness rise around the turn-on voltage. We adopt calcium-tributylphosphine oxide hybrid ligand passivation to produce highly dispersed large-size colloidal CsPbBr₃ PNCs with a weak size confinement effect and also high photoluminescence quantum yield (∼85%). Utilizing these large-size PNCs as emitters, we manifest that the detrimental effects caused by the quantum confinement effect can be avoided in the device, thereby realizing the highest color purity in green PNCLED, with a narrow full width at half-maximum of 16.4 nm and a high corrected maximum external quantum efficiency of 17.85%. Moreover, the operation half-life time of the large-size PNCLED is 5-fold of that based on smaller-size PNCs. Our work provides a new avenue for improving the performance of PNCLEDs based on unconventional large-size effects.

中文翻译：

使用尺寸超过玻尔激子直径的钙钛矿纳米晶体的高颜色纯度和高效绿色发光二极管

卤化铅钙钛矿纳米晶体（PNC）正在成为有前途的发光体，积极探索高色纯度和高效发光二极管。然而，报道最多的卤化铅钙钛矿纳米晶体发光二极管（PNCLED）遇到了由量子限制效应引起的发射线宽变宽和工作电压升高的问题。在这里，我们报告了一种使用大尺寸 CsPbBr ₃ PNC 的新型 PNCLED，其过度超过了玻尔激子直径，实现了超窄发射线宽和开启电压附近的快速亮度上升。我们采用钙-三丁基氧化膦杂化配体钝化制备高度分散的大尺寸胶体CsPbBr ₃PNCs 具有弱尺寸限制效应和高光致发光量子产率（~85%）。利用这些大尺寸 PNC 作为发射器，我们证明可以在器件中避免由量子限制效应引起的不利影响，从而实现绿色 PNCLED 的最高色纯度，半高宽窄至 16.4 nm和 17.85% 的高校正最大外量子效率。此外，大尺寸 PNCLED 的工作半衰期是基于小尺寸 PNC 的 5 倍。我们的工作为基于非常规大尺寸效应提高 PNCLED 的性能提供了新途径。

更新日期：2021-12-01

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