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High-Brightness Perovskite Light-Emitting Diodes Based on FAPbBr3 Nanocrystals with Rationally Designed Aromatic Ligands
ACS Energy Letters ( IF 19.3 ) Pub Date : 2021-06-08 , DOI: 10.1021/acsenergylett.1c00812
Haifeng Zhao 1, 2 , Hongting Chen 2, 3 , Sai Bai 2, 4 , Chaoyang Kuang 2 , Xiyu Luo 2, 5 , Pengpeng Teng 2, 6 , Chunyang Yin 2 , Peng Zeng 1 , Lintao Hou 3 , Ying Yang 6 , Lian Duan 5 , Feng Gao 2 , Mingzhen Liu 1
Affiliation  

Despite rapid developments of light-emitting diodes (LEDs) based on emerging perovskite nanocrystals (PeNCs), it remains challenging to achieve devices with integrated high efficiencies and high brightness because of the insulating long-chain ligands used for the PeNCs. Herein, we develop highly luminescent and stable formamidinium lead bromide PeNCs capped with rationally designed short aromatic ligands of 2-naphthalenesulfonic acid (NSA) for LEDs. Compared with commonly used oleic acid ligands, the NSA molecules not only preserve the surface properties of the PeNCs during the purification but also notably improve the electrical properties of the assembled emissive layers, ensuring efficient charge injection/transport in the devices. The resulting champion LED with electroluminescence approaching the Rec. 2020 green primary color demonstrates a high brightness of 67 115 cd cm–2 and a peak external quantum efficiency of 19.2%. More impressively, the device shows negligibly decreased efficiency at an elevated brightness of 20 000 cd cm–2 and a well-retained efficiency of over 10% at around 65 000 cd cm–2, presenting a breakthrough in LEDs based on PeNCs.

中文翻译:

基于 FAPbBr 3纳米晶体和合理设计的芳香配体的高亮度钙钛矿发光二极管

尽管基于新兴钙钛矿纳米晶体 (PeNC) 的发光二极管 (LED) 发展迅速,但由于 PeNC 使用绝缘长链配体,实现具有集成高效率和高亮度的器件仍然具有挑战性。在此,我们为 LED 开发了高度发光且稳定的甲脒溴化铅 PeNC,其顶部有合理设计的 2-萘磺酸 (NSA) 短芳族配体。与常用的油酸配体相比,NSA 分子不仅在纯化过程中保留了 PeNCs 的表面特性,而且显着改善了组装发射层的电特性,确保了器件中有效的电荷注入/传输。由此产生的电致发光冠军 LED 接近 Rec。–2和 19.2% 的峰值外量子效率。更令人印象深刻的是,该器件在 20 000 cd cm –2的高亮度下显示出的效率降低可以忽略不计,并且在 65 000 cd cm –2左右时仍保持超过 10% 的良好效率,这是基于 PeNC 的 LED 的突破。
更新日期:2021-07-09
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