Yixiao Yin, Yinyan Wu, Binghong He, Zekun Xia, Weiguo Zhu, Jun Yeob Lee, Yafei Wang
{"title":"HLCT 发射器的新概念:用于高效和极低效率滚降溶液加工型有机发光二极管的复合系统中的受体分子","authors":"Yixiao Yin, Yinyan Wu, Binghong He, Zekun Xia, Weiguo Zhu, Jun Yeob Lee, Yafei Wang","doi":"10.1021/acsmaterialslett.4c01643","DOIUrl":null,"url":null,"abstract":"The use of hybridized local and charge-transfer (HLCT) emitters as acceptor or donor molecules in exciplex systems is still a novel concept even though HLCT molecules can harvest both singlet and triplet excitons. Herein, two HLCT emitters, 2-<sup><i>t</i></sup>Bu<i>spo</i>Cz-2pTrz and 2-<sup><i>t</i></sup>Bu<i>spo</i>Cz-Me3pTrz, are prepared as acceptors of exciplexes with thermally activated delayed fluorescence (TADF) properties. The exciplex TADF systems constructed by mixing HLCT and TAPC molecules have a minute energy gap between singlet and triplet excited states and unity emission efficiency. Using the exciplex as an emitter, solution-processed devices achieve maximum external quantum efficiency (<i>EQE</i><sub>max</sub>) of 16.6%. Impressively, solution-processed devices with the fabricated exciplexes as hosts exhibit extremely low turn-on voltages and a promising <i>EQE</i><sub>max</sub> of >20%, which is concomitant with an extremely low-efficiency roll-off of 0.5% at 1,000 cd m<sup>–2</sup>. This study explores the potential of HLCT emitters as acceptors of exciplexes and guides the design of efficient exciplex systems.","PeriodicalId":19,"journal":{"name":"ACS Materials Letters","volume":"3 1","pages":""},"PeriodicalIF":9.6000,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"New Concept for HLCT Emitter: Acceptor Molecule in Exciplex System for Highly Efficient and Extremely Low-Efficiency Roll-Off Solution-Processed OLED\",\"authors\":\"Yixiao Yin, Yinyan Wu, Binghong He, Zekun Xia, Weiguo Zhu, Jun Yeob Lee, Yafei Wang\",\"doi\":\"10.1021/acsmaterialslett.4c01643\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The use of hybridized local and charge-transfer (HLCT) emitters as acceptor or donor molecules in exciplex systems is still a novel concept even though HLCT molecules can harvest both singlet and triplet excitons. Herein, two HLCT emitters, 2-<sup><i>t</i></sup>Bu<i>spo</i>Cz-2pTrz and 2-<sup><i>t</i></sup>Bu<i>spo</i>Cz-Me3pTrz, are prepared as acceptors of exciplexes with thermally activated delayed fluorescence (TADF) properties. The exciplex TADF systems constructed by mixing HLCT and TAPC molecules have a minute energy gap between singlet and triplet excited states and unity emission efficiency. Using the exciplex as an emitter, solution-processed devices achieve maximum external quantum efficiency (<i>EQE</i><sub>max</sub>) of 16.6%. Impressively, solution-processed devices with the fabricated exciplexes as hosts exhibit extremely low turn-on voltages and a promising <i>EQE</i><sub>max</sub> of >20%, which is concomitant with an extremely low-efficiency roll-off of 0.5% at 1,000 cd m<sup>–2</sup>. This study explores the potential of HLCT emitters as acceptors of exciplexes and guides the design of efficient exciplex systems.\",\"PeriodicalId\":19,\"journal\":{\"name\":\"ACS Materials Letters\",\"volume\":\"3 1\",\"pages\":\"\"},\"PeriodicalIF\":9.6000,\"publicationDate\":\"2024-09-19\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"ACS Materials Letters\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://doi.org/10.1021/acsmaterialslett.4c01643\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Materials Letters","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1021/acsmaterialslett.4c01643","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
New Concept for HLCT Emitter: Acceptor Molecule in Exciplex System for Highly Efficient and Extremely Low-Efficiency Roll-Off Solution-Processed OLED
The use of hybridized local and charge-transfer (HLCT) emitters as acceptor or donor molecules in exciplex systems is still a novel concept even though HLCT molecules can harvest both singlet and triplet excitons. Herein, two HLCT emitters, 2-tBuspoCz-2pTrz and 2-tBuspoCz-Me3pTrz, are prepared as acceptors of exciplexes with thermally activated delayed fluorescence (TADF) properties. The exciplex TADF systems constructed by mixing HLCT and TAPC molecules have a minute energy gap between singlet and triplet excited states and unity emission efficiency. Using the exciplex as an emitter, solution-processed devices achieve maximum external quantum efficiency (EQEmax) of 16.6%. Impressively, solution-processed devices with the fabricated exciplexes as hosts exhibit extremely low turn-on voltages and a promising EQEmax of >20%, which is concomitant with an extremely low-efficiency roll-off of 0.5% at 1,000 cd m–2. This study explores the potential of HLCT emitters as acceptors of exciplexes and guides the design of efficient exciplex systems.
期刊介绍:
ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.