利用载流子陷阱-陷阱机制在有机发光二极管中激发三重态-三重态融合

IF 3.7 3区 工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Information Display Pub Date : 2022-06-24 DOI:10.1080/15980316.2022.2089750
Kyung Hyung Lee, Jae Min Kim, S. Jeong, Ji‐Ho Baek, Jeongdae Seo, I. Song, Sang Beom Kim, H. Choi, Jun Yeob Lee
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引用次数: 5

摘要

三重态-三重态聚变(TTF)是由两个三重态激子碰撞引起的荧光有机发光二极管(OLED)的效率提高机制。然而,尽管由于TTF型发射极和EBL之间的电荷不平衡和空穴积累,在电子阻挡层(EBL)附近的窄复合区内采用了使三重态激子密度最大化的器件策略,但在荧光OLED中实现高TTF比一直是困难的。基于陷阱去俘获机制,我们能够通过在TTF发射极中添加TTF辅助材料(TTF-AM)来实现改进的TTF比并减少空穴积累。TTF-AM作为空穴传输通道,触发空穴陷阱和去陷阱,同时改善了发射层的空穴传输特性。通过空穴去俘获过程,改进的空穴输运性质平衡了载流子并产生了更多的三重态激子,以激活从低到高电流密度范围的TTF机制。通过调节TTF-AM,蒽基发射极的TTF比从5.5/20.1%增加到13.4/25.5%(低/高电流密度),从而导致在低电流密度下的外量子效率增加了一倍以上。
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Stimulated triplet–triplet fusion by carrier trap-detrap mechanism in organic light-emitting diodes
Triplet–triplet fusion (TTF) has been an efficiency-enhancing mechanism in fluorescent organic light-emitting diodes (OLEDs) caused by the collision of two triplet excitons. However, achieving a high TTF ratio in fluorescent OLEDs has been difficult despite device strategies to maximize the triplet exciton density within a narrow recombination zone near the electron blocking layer (EBL) due to charge imbalance and hole accumulation between the TTF type emitter and EBL. Based on a trap-detrap mechanism, we were able to realize an improved TTF ratio and reduce hole accumulation by adding a TTF-assisting material (TTF-AM) in the TTF emitter. The TTF-AM served as the hole transport channel, triggering hole trap and detrap while improving the hole transport character of the emitting layer. Through the process of hole detrapping, the improved hole transport properties balanced carriers and generated more triplet excitons in order to activate the TTF mechanism from low to high current density ranges. By adjusting the TTF-AM, the TTF ratio of the anthracene-based emitter was increased from 5.5/20.1% to 13.4/25.5% (low/high current density), thereby resulting in more than doubled external quantum efficiency at low current density.
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来源期刊
Journal of Information Display
Journal of Information Display MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
7.10
自引率
5.40%
发文量
27
审稿时长
30 weeks
期刊最新文献
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