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In Situ-Fabricated Perovskite Nanocrystals for Deep-Blue Light-Emitting Diodes
The Journal of Physical Chemistry Letters ( IF 5.7 ) Pub Date : 2020-11-24 , DOI: 10.1021/acs.jpclett.0c03120
Wenjie Xu 1 , Ruiqi Ji 1 , Pinlei Liu 1 , Lu Cheng 1 , Lin Zhu 1 , Ju Zhang 1 , Hong Chen 1 , Yunfang Tong 1 , Chenglong Zhang 1 , Zhiyuan Kuang 1 , Hao Zhang 1 , Jingya Lai 1 , Kaichuan Wen 1 , Pinghui Yang 1 , Nana Wang 1 , Wei Huang 1, 2 , Jianpu Wang 1
Affiliation  

Efficient and stable deep-blue emission from perovskite light-emitting diodes (LEDs) is required for their application in lighting and displays. However, this is difficult to achieve due to the phase segregation issue of mixed halide perovskites and the challenge of synthesizing high-quality single-halide deep-blue perovskite nanocrystals through a traditional method. Here, we show that an antisolvent treatment can facilitate the in situ formation of perovskite nanocrystals using a facile spin-coating method. We find that the dropping time of the antisolvent can significantly affect the constitution of nanocrystal perovskite films. With a delay in the start time of the antisolvent treatment, small single-halide perovskite nanocrystals can be achieved, exhibiting efficient deep-blue emission. The LED device shows a stable electroluminescence (EL) peak at 465 nm, with a peak external quantum efficiency and a peak current efficiency of 2.4% and 2.5 cd A–1, respectively. This work provides a facile approach to changing the size of perovskite nanocrystals, thus effectively tuning their EL emission spectra.

中文翻译:

用于深蓝色发光二极管的原位制备钙钛矿纳米晶体

钙钛矿发光二极管(LED)需要高效,稳定的深蓝色发射,才能将其应用于照明和显示器。然而,由于混合卤化物钙钛矿的相分离问题以及通过传统方法合成高质量的单卤化物深蓝色钙钛矿纳米晶体的挑战,很难做到这一点。在这里,我们表明,使用方便的旋涂方法,抗溶剂处理可以促进钙钛矿纳米晶体的原位形成。我们发现,抗溶剂的滴落时间可以显着影响纳米晶钙钛矿薄膜的组成。随着抗溶剂处理开始时间的延迟,可以获得小的单卤化物钙钛矿纳米晶体,表现出有效的深蓝色发射。分别为–1。这项工作为改变钙钛矿纳米晶体的尺寸提供了一种简便的方法,从而有效地调节了它们的EL发射光谱。
更新日期:2020-12-17
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