Kaibo Fang, Jiasen Zhang, Wei Li, Xilin Mu, Chunyu Liu, Yujie Wu, Tingting Feng, Xianfeng Qiao, Tao Wang, Ziyi Ge
{"title":"Symmetry Molecular Design Strategy for Highly Efficient Blue Electroluminescence with Hot Exciton Mechanisms","authors":"Kaibo Fang, Jiasen Zhang, Wei Li, Xilin Mu, Chunyu Liu, Yujie Wu, Tingting Feng, Xianfeng Qiao, Tao Wang, Ziyi Ge","doi":"10.1002/lpor.202400096","DOIUrl":null,"url":null,"abstract":"Emitters with a hot exciton mechanism are regarded as one of the most promising candidates for organic light-emitting diodes (OLEDs). In this study, a deep-blue emitter with the hot exciton mechanism is reported, namely <b>2An-PCz</b>, by integrating a pair of carbazole groups with a 9,9′-bi-anthracene nucleus. Owing to the symmetric molecular architecture and intrinsic local excited state character, multiple high-lying reverse intersystem cross (<i>h</i>RISC) channels and large overlaps of frontier molecular orbits (FMOs) can be formed, facilitating rapid hRISC processes as well as enhancement of radiative transition rates simultaneously. Combined with the strong luminescence properties brought by the unique X-packing mode, a high photoluminescence quantum yield of 60.5% is achieved in the non-doped state. Strikingly, non-doped deep-blue OLEDs exhibited a maximum external quantum efficiency (EQE) of 10.50% with minimal efficient roll-off, which is one of the highest values for deep-blue organic light-emitting devices based on hot exciton emitters thus far. The magneto-electroluminescence (MEL) experiment and transient electroluminescence measurements corroborated that both the high EQE and suppressed efficiency roll-off are attributable to the rapid “hot exciton” channels.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":null,"pages":null},"PeriodicalIF":9.8000,"publicationDate":"2024-06-17","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.202400096","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
Emitters with a hot exciton mechanism are regarded as one of the most promising candidates for organic light-emitting diodes (OLEDs). In this study, a deep-blue emitter with the hot exciton mechanism is reported, namely 2An-PCz, by integrating a pair of carbazole groups with a 9,9′-bi-anthracene nucleus. Owing to the symmetric molecular architecture and intrinsic local excited state character, multiple high-lying reverse intersystem cross (hRISC) channels and large overlaps of frontier molecular orbits (FMOs) can be formed, facilitating rapid hRISC processes as well as enhancement of radiative transition rates simultaneously. Combined with the strong luminescence properties brought by the unique X-packing mode, a high photoluminescence quantum yield of 60.5% is achieved in the non-doped state. Strikingly, non-doped deep-blue OLEDs exhibited a maximum external quantum efficiency (EQE) of 10.50% with minimal efficient roll-off, which is one of the highest values for deep-blue organic light-emitting devices based on hot exciton emitters thus far. The magneto-electroluminescence (MEL) experiment and transient electroluminescence measurements corroborated that both the high EQE and suppressed efficiency roll-off are attributable to the rapid “hot exciton” channels.
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.