Highly Efficient Deep-Blue Organic Light-Emitting Diodes Based on Rational Molecular Design and Device Engineering

Masashi Mamada; Hiroshi Katagiri; Chin-Yiu ChanYi-Ting LeeKenichi GoushiHajime NakanotaniTakuji HatakeyamaChihaya Adachi

首页> 外文期刊>Advanced functional materials >Highly Efficient Deep-Blue Organic Light-Emitting Diodes Based on Rational Molecular Design and Device Engineering

【24h】

Highly Efficient Deep-Blue Organic Light-Emitting Diodes Based on Rational Molecular Design and Device Engineering

机译：Highly Efficient Deep-Blue Organic Light-Emitting Diodes Based on Rational Molecular Design and Device Engineering

获取原文

获取原文并翻译 | 示例

掌桥外文数据库（机构版） >>

开具论文收录证明 >>

文献代查 >>

页面导航

摘要
著录项
相关主题

摘要

There is increasing interest in thermally activated delayed fluorescence (TADF) in materials, and to understand its mechanism in the excited state dynamics. Recent challenges include color purity, efficient deep-blue emission, fast exciton decay lifetimes, high reverse intersystem crossing rates (k_(RISC)), low-efficiency roll-off in organic light-emitting diodes (OLEDs), and long device lifetimes. Here, a series of compounds having benzonitrile and carbazole rings are examined, that provide a detailed understanding of the excited states, and a guideline for high-performance TADF. A dense alignment of the excited states with several different characters within a small energy range results in high kRISC of >2 × 10~6 s~(?1), while maintaining radiative rate constants (k_r) >10~7 s~(?1). OLEDs based on the optimum compound exhibit a low-efficiency roll-off and a CIEy (y color coordinate of Commission Internationale de l’éclairage) <0.4. TADF-assisted fluorescence (TAF) OLED exhibits a maximum external quantum efficiency of 22.4% with CIE coordinates (0.13,0.15). This work also provides insights for device engineering and molecular designs.

著录项

来源
《Advanced functional materials》 |2022年第32期|2204352.1-2204352.10|共10页
作者
Masashi Mamada; Hiroshi Katagiri; Chin-Yiu ChanYi-Ting LeeKenichi GoushiHajime NakanotaniTakuji HatakeyamaChihaya Adachi;
展开▼
作者单位

Center for Organic Photonics and Electronics Research (OPERA) Kyushu University Fukuoka 819-0395, Japan,International Institute for Carbon Neutral Energy Research (WPI-I2CNER) Kyushu University Nishi, Fukuoka 819-0395, Japan;

Graduate School of Organic Materials Science Yamagata University 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan;

Center for Organic Photonics and Electronics Research (OPERA) Kyushu University Fukuoka 819-0395, JapanDepartment of Chemistry Graduate School of Science Kyoto University Sakyo-ku, Kyoto 606-8502, Japan;

展开▼
收录信息
原文格式 PDF
正文语种英语
中图分类
关键词
DABNA; hyperfluorescence; organic light-emitting diodes; reverse intersystem crossing; TADF;

Highly Efficient Deep-Blue Organic Light-Emitting Diodes Based on Rational Molecular Design and Device Engineering

摘要

著录项

相关主题

期刊订阅