Highly efficient pure red light-emitting diodes enabled by multifunctional ligand-coordinated CsPbI3 quantum dots

IF 16.8 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Nano Energy Pub Date : 2025-04-21 DOI:10.1016/j.nanoen.2025.111055

Jing Li , Xiaofeng Hu , Yifeng Feng , Xiuyuan Chen , Jiajie Ye , Xinyang Wang , Chenchen Yang , Dingshuo Zhang , Qiuting Cai , Haiping He , Zhizhen Ye , Qingquan He , Xingliang Dai , Jun Pan

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Abstract

Efficient perovskite light-emitting diodes (PeLEDs) that emit at wavelengths between 620 and 650 nm are key to the next generation of ultrahigh-definition displays. Quantum-confined CsPbI₃ quantum dots (QDs) can overcome the intrinsically narrow bandgap, thus meeting the requirements of pure red emitters. However, the inherent instability and poor carrier transport properties of CsPbI₃ QDs hinder their device performance. Herein, we introduce thiophene-2-sulfonamide (2-ThSA), a short-chain multifunctional ligand, to passivate surface defects and enhance carrier transport in CsPbI₃ QDs. The 2-ThSA treated QDs exhibited a near 100 % photoluminescence quantum yield (PLQY), observably improved stability, and enhanced carrier transport properties due to the strong interactions between the CsPbI₃ QDs and multiple functional groups of 2-ThSA. PeLEDs based on these modified QDs demonstrated superior spectral stability, reached a remarkable external quantum efficiency (EQE) of 28.73 %, and displayed low efficiency roll-off. Additionally, large-area devices (64 mm²) showed an EQE exceeding 20 %, highlighting the potential of our approach for high-performance, large-scale displays.

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多功能配体配位 CsPbI3 量子点实现高效纯红色发光二极管

高效的钙钛矿发光二极管（PeLEDs）发射波长在620到650纳米之间，是下一代超高清显示器的关键。量子受限的CsPbI3量子点（QDs）可以克服固有的窄带隙，从而满足纯红色发射体的要求。然而，CsPbI3量子点固有的不稳定性和较差的载流子输运特性阻碍了它们的器件性能。在此，我们引入了一种短链多功能配体噻吩-2-磺胺（2-ThSA）来钝化CsPbI3量子点的表面缺陷并增强载流子的输运。由于CsPbI3量子点与2-ThSA的多个官能团之间的强相互作用，2-ThSA处理的量子点表现出接近100%的光致发光量子产率（PLQY），明显改善了稳定性，并增强了载流子输运特性。基于这些修饰量子点的ped具有良好的光谱稳定性，达到了28.73%的外量子效率（EQE），并表现出低效率滚降。此外，大面积设备（64 mm2）显示出超过20%的EQE，突出了我们的方法在高性能，大规模显示器方面的潜力。

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来源期刊

Nano Energy CHEMISTRY, PHYSICAL-NANOSCIENCE & NANOTECHNOLOGY

CiteScore

30.30

自引率

7.40%

发文量

1207

审稿时长

23 days

期刊介绍： Nano Energy is a multidisciplinary, rapid-publication forum of original peer-reviewed contributions on the science and engineering of nanomaterials and nanodevices used in all forms of energy harvesting, conversion, storage, utilization and policy. Through its mixture of articles, reviews, communications, research news, and information on key developments, Nano Energy provides a comprehensive coverage of this exciting and dynamic field which joins nanoscience and nanotechnology with energy science. The journal is relevant to all those who are interested in nanomaterials solutions to the energy problem. Nano Energy publishes original experimental and theoretical research on all aspects of energy-related research which utilizes nanomaterials and nanotechnology. Manuscripts of four types are considered: review articles which inform readers of the latest research and advances in energy science; rapid communications which feature exciting research breakthroughs in the field; full-length articles which report comprehensive research developments; and news and opinions which comment on topical issues or express views on the developments in related fields.