{"title":"Exciton Dissociation and Long-Lived Delayed Components in High-Efficiency Quasi-Two-Dimensional Green Perovskite Light-Emitting Diodes","authors":"Guanwei Sun, Sheng Liao, Guo-Xi Yang, Chenyang Shen, Ling Hong, Denghui Liu, Junrong Pu, Weidong Qiu, Zijian Chen, Zhihai Yang, Fei Huang, Ming-De Li, Shi-Jian Su","doi":"10.1002/lpor.202400732","DOIUrl":null,"url":null,"abstract":"Quasi-two-dimensional (quasi-2D) perovskites, consisting of multi-quantum wells (MQWs) separated by organic intercalating cations, exhibit high luminescence efficiency while the photophysical processes involved remain partially obscure due to the uncertainty of the MQWs structure. Herein, a synergetic dual-additive strategy is adopted to prepare quasi-2D perovskite films, where 18-crown-6 and tris(4-fluorophenyl)phosphine oxide are utilized to suppress the formation of low-dimensional perovskites, diminish defect density, and enhance photoluminescence quantum yield to 93.7%. Notably, a long-lived delayed component, spanning hundreds of microseconds, is identified for the first time in perovskite emitters, which correlates with exciton dissociation and recombination, and the differences in temperature-dependent radiative lifetime of the delayed components match with the luminescence properties. Finally, benefiting from lower trap density and more efficient energy-funneling, green PeLEDs treated with dual additives have achieved a high external quantum efficiency of 28.9% and a commendable operating half-lifetime of 17.8 h at an initial brightness of 500 cd m<sup>−2</sup>. The observation of the long-lived delayed components, coupled with insights into exciton dissociation, provides a profound and comprehensive understanding of the fundamental carrier behavior in perovskite emitters and establishes a direct correlation between the properties of perovskite emitters and their photophysical processes.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"5 1","pages":""},"PeriodicalIF":9.8000,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Laser & Photonics Reviews","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1002/lpor.202400732","RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
Abstract
Quasi-two-dimensional (quasi-2D) perovskites, consisting of multi-quantum wells (MQWs) separated by organic intercalating cations, exhibit high luminescence efficiency while the photophysical processes involved remain partially obscure due to the uncertainty of the MQWs structure. Herein, a synergetic dual-additive strategy is adopted to prepare quasi-2D perovskite films, where 18-crown-6 and tris(4-fluorophenyl)phosphine oxide are utilized to suppress the formation of low-dimensional perovskites, diminish defect density, and enhance photoluminescence quantum yield to 93.7%. Notably, a long-lived delayed component, spanning hundreds of microseconds, is identified for the first time in perovskite emitters, which correlates with exciton dissociation and recombination, and the differences in temperature-dependent radiative lifetime of the delayed components match with the luminescence properties. Finally, benefiting from lower trap density and more efficient energy-funneling, green PeLEDs treated with dual additives have achieved a high external quantum efficiency of 28.9% and a commendable operating half-lifetime of 17.8 h at an initial brightness of 500 cd m−2. The observation of the long-lived delayed components, coupled with insights into exciton dissociation, provides a profound and comprehensive understanding of the fundamental carrier behavior in perovskite emitters and establishes a direct correlation between the properties of perovskite emitters and their photophysical processes.
期刊介绍:
Laser & Photonics Reviews is a reputable journal that publishes high-quality Reviews, original Research Articles, and Perspectives in the field of photonics and optics. It covers both theoretical and experimental aspects, including recent groundbreaking research, specific advancements, and innovative applications.
As evidence of its impact and recognition, Laser & Photonics Reviews boasts a remarkable 2022 Impact Factor of 11.0, according to the Journal Citation Reports from Clarivate Analytics (2023). Moreover, it holds impressive rankings in the InCites Journal Citation Reports: in 2021, it was ranked 6th out of 101 in the field of Optics, 15th out of 161 in Applied Physics, and 12th out of 69 in Condensed Matter Physics.
The journal uses the ISSN numbers 1863-8880 for print and 1863-8899 for online publications.