Negative-Charge Management Strategy for Both Lifetime Enhancement and Efficiency Roll-Off Suppression in Blue OLEDs

IF 9.6 1区化学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Materials Letters Pub Date : 2024-11-22 DOI:10.1021/acsmaterialslett.4c0175810.1021/acsmaterialslett.4c01758

Guangrui Zhu, Jinyu Song, Zhou Deng, Ruichen Yi, Xiao-Chun Hang, Chunqin Zhu, Xiaoyuan Hou*, Zhengyi Sun* and Jiajun Qin*,

{"title":"Negative-Charge Management Strategy for Both Lifetime Enhancement and Efficiency Roll-Off Suppression in Blue OLEDs","authors":"Guangrui Zhu, Jinyu Song, Zhou Deng, Ruichen Yi, Xiao-Chun Hang, Chunqin Zhu, Xiaoyuan Hou*, Zhengyi Sun* and Jiajun Qin*, ","doi":"10.1021/acsmaterialslett.4c0175810.1021/acsmaterialslett.4c01758","DOIUrl":null,"url":null,"abstract":"Simultaneously achieving efficient and robust blue organic light-emitting diodes (OLEDs) is a grand challenge, where one of the limitations lies in hole transport materials (HTMs). Here, we unravel the degradation mechanisms of the most promising and widely used HTM, di-[4-(N,N-di-p-tolyl-amino)-phenyl]cyclohexane (TAPC). A luminescent defect is discovered in TAPC during degradation in blue OLEDs, which is induced by a two-step electron-induced process. To suppress this degradation, we propose a negative-charge management strategy by introducing a strong electron-withdrawing material, fullerene, at the TAPC interface. This strategy is proven effective in blue phosphorescent OLEDs, resulting in not only a 10-fold enhancement in operational lifetime but also a significant suppression in efficiency roll-off at high brightness over 30 000 cd m–2. Our findings offer a feasible solution to improve the operational stability of blue OLEDs in which the degradation of HTM plays a role, potentially accelerating the commercialization of high-efficiency long-lasting OLED displays.","PeriodicalId":19,"journal":{"name":"ACS Materials Letters","volume":"7 1","pages":"32–40 32–40"},"PeriodicalIF":9.6000,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsmaterialslett.4c01758","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Materials Letters","FirstCategoryId":"92","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acsmaterialslett.4c01758","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Simultaneously achieving efficient and robust blue organic light-emitting diodes (OLEDs) is a grand challenge, where one of the limitations lies in hole transport materials (HTMs). Here, we unravel the degradation mechanisms of the most promising and widely used HTM, di-[4-(N,N-di-p-tolyl-amino)-phenyl]cyclohexane (TAPC). A luminescent defect is discovered in TAPC during degradation in blue OLEDs, which is induced by a two-step electron-induced process. To suppress this degradation, we propose a negative-charge management strategy by introducing a strong electron-withdrawing material, fullerene, at the TAPC interface. This strategy is proven effective in blue phosphorescent OLEDs, resulting in not only a 10-fold enhancement in operational lifetime but also a significant suppression in efficiency roll-off at high brightness over 30 000 cd m^–2. Our findings offer a feasible solution to improve the operational stability of blue OLEDs in which the degradation of HTM plays a role, potentially accelerating the commercialization of high-efficiency long-lasting OLED displays.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

ACS Materials Letters MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

14.60

自引率

3.50%

发文量

261

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.