Li Yanming, Deng Ming, Zhang Xuanyu, Xu Ting, Wang Ximeng, Yao Zhiwei, Wang Qiangqiang, Qian Lei, Xiang Chaoyu
Laboratory of Advanced Nano-Optoelectronic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Science, Ningbo, Zhejiang, 315201, China.
Laboratory of Advanced Nano-Optoelectronic Materials and Devices, Qianwan Institute of CNITECH, Ningbo, P. R. China, Ningbo, 315300, China.
Nat Commun. 2024 Jul 7;15(1):5696. doi: 10.1038/s41467-024-50022-8.
Even though lead halide perovskite has been demonstrated as a promising optoelectronic material for next-generation display applications, achieving high-efficiency and stable pure-red (620~635 nm) emission to cover the full visible wavelength is still challenging. Here, we report perovskite light-emitting diodes emitting pure-red light at 628 nm achieving high external quantum efficiencies of 26.04%. The performance is attributed to successful synthesizing strongly confined CsPbI quantum dots with good stability. The strong binding 2-naphthalene sulfonic acid ligands are introduced after nucleation to suppress Ostwald ripening, meanwhile, ammonium hexafluorophosphate exchanges long chain ligands and avoids regrowth by strong binding during the purification process. Both ligands enhance the charge transport ability of CsPbI quantum dots. The state-of-the-art synthesis of pure red CsPbI quantum dots achieves 94% high quantum efficiency, which can maintain over 80% after 50 days, providing a method for synthesizing stable strong confined perovskite quantum dots.
尽管卤化铅钙钛矿已被证明是一种用于下一代显示应用的有前途的光电子材料，但要实现覆盖整个可见波长的高效且稳定的纯红色（620~635nm）发射仍然具有挑战性。在此，我们报道了在628nm处发射纯红色光的钙钛矿发光二极管，其实现了26.04%的高外量子效率。该性能归因于成功合成了具有良好稳定性的强受限CsPbI量子点。成核后引入强结合的2-萘磺酸配体以抑制奥斯特瓦尔德熟化，同时，六氟磷酸铵交换长链配体并在纯化过程中通过强结合避免再生长。两种配体均增强了CsPbI量子点的电荷传输能力。最先进的纯红色CsPbI量子点合成实现了94%的高量子效率，50天后仍可保持超过80%，为合成稳定的强受限钙钛矿量子点提供了一种方法。
