Статья

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

Mubing YuNational Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, 150080, Harbin, ChinaTing‐Xiao QinBeijing Academy of Quantum Information Sciences, 100193, Beijing, ChinaGang GaoNational Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, 150080, Harbin, China. [email protected]Ke-Lei ZuCenter for Optoelectronics Engineering Research, School of Physics and Astronomy, Yunnan University, 650500, Kunming, ChinaDongming ZhangCenter for Optoelectronics Engineering Research, School of Physics and Astronomy, Yunnan University, 650500, Kunming, ChinaNan ChenCenter for Optoelectronics Engineering Research, School of Physics and Astronomy, Yunnan University, 650500, Kunming, ChinaDengke WangCenter for Optoelectronics Engineering Research, School of Physics and Astronomy, Yunnan University, 650500, Kunming, ChinaYong HuaYunnan Key Laboratory for Micro/Nano Materials & Technology, School of Materials and Energy, Yunnan University, 650500, Kunming, ChinaHong ZhangZhengzhou Research Institute, Harbin Institute of Technology, 450046, Zhengzhou, ChinaYong‐Biao ZhaoCenter for Optoelectronics Engineering Research, School of Physics and Astronomy, Yunnan University, 650500, Kunming, China. [email protected]Jiaqi ZhuKey Laboratory of Micro-systems and Micro-structures Manufacturing Ministry of Education, Harbin Institute of Technology, 150080, Harbin, China. [email protected]

2025en

ABI

Аннотация

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 0.88 ps, extraordinary exciton binding energy of 122.53 meV, and higher photoluminescence quantum yield of 60.9% for RDP films with deep-blue emission at 450 nm. 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 454 nm were demonstrated, representing the best-performing deep-blue PeLEDs.

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Идентификаторы

DOI: 10.1038/s41377-025-01768-3

Цитирования и источники

Цитирований: 8Использованных источников: 0

Показатели — AkademScholar