哈尔滨工业大学朱嘉琦团队通过原位氯化对降维钙钛矿进行多缺陷修复和相位重建，以获得高效的深蓝色（454 nm）发光二极管。2025年2月26日，《光：科学与应用》发表了这一成果。

基于降维钙钛矿（RDP）的深蓝色钙钛矿发光二极管（PeLED）仍然面临一些挑战，包括严重的陷阱辅助非辐射复合、缓慢的激子转移和电致发光光谱的不良红移，阻碍了高性能PeLED的实现。

研究组采用原位氯化（isCl）后处理策略来调节相重构并修复RDP的多个缺陷，使RDP薄膜在450 nm处具有0.88 ps的优异载流子冷却、122.53 meV的非凡激子结合能和60.9%的更高光致发光量子产率。

相调节是通过抑制小n相形成的氟衍生氢键来实现的。多种缺陷，包括卤化物空位（浅态缺陷）和氯化铅反位缺陷（深态缺陷），通过C=O配位和羟基衍生的氢键进行修复。因此，研究组展示了具有创纪录的最大外部量子效率6.17%和454 nm稳定电致发光的深蓝色PeLED，代表了性能最好的深蓝色PELED。

附：英文原文

Title: Multiple defects renovation and phase reconstruction of reduced-dimensional perovskites via in situ chlorination for efficient deep-blue (454nm) light-emitting diodes

Author: Yu, Mubing, Qin, Tingxiao, Gao, Gang, Zu, Kelei, Zhang, Dongming, Chen, Nan, Wang, Dengke, Hua, Yong, Zhang, Hong, Zhao, Yong-Biao, Zhu, Jiaqi

Issue&Volume: 2025-02-26

Abstract: Deep-blue perovskite light-emitting diodes (PeLEDs) based on reduced-dimensional perovskites (RDPs) still face a few challenges including severe trap-assisted nonradiative recombination, sluggish exciton transfer, and undesirable bathochromic shift of the electroluminescence spectra, impeding the realization of high-performance PeLEDs. Herein, an in situ chlorination (isCl) post-treatment strategy was employed to regulate phase reconstruction and renovate multiple defects of RDPs, leading to superior carrier cooling of 0.88ps, extraordinary exciton binding energy of 122.53meV, and higher photoluminescence quantum yield of 60.9% for RDP films with deep-blue emission at 450nm. The phase regulation is accomplished via fluorine-derived hydrogen bonds that suppress the formation of small-n phases. Multiple defects, including halide vacancies (shallow-state defects) and lead-chloride antisite defects (deep-state defects), are renovated via C=O coordination and hydroxy-group-derived hydrogen bonds. Consequently, deep-blue PeLEDs with a record maximum external quantum efficiency of 6.17% and stable electroluminescence at 454nm were demonstrated, representing the best-performing deep-blue PeLEDs.

DOI: 10.1038/s41377-025-01768-3

Source: https://www.nature.com/articles/s41377-025-01768-3