Red Organic Light-Emitting Diode with External Quantum Efficiency beyond 20% Based on a Novel Thermally Activated Delayed Fluorescence Emitter

被引:203
作者
Chen, Jia-Xiong [1 ,2 ]
Wang, Kai [1 ,2 ]
Zheng, Cai-Jun [3 ]
Zhang, Ming [1 ,2 ,3 ]
Shi, Yi-Zhong [1 ,2 ]
Tao, Si-Lu [3 ]
Lin, Hui [3 ]
Liu, Wei [1 ,2 ]
Tao, Wen-Wen [1 ,2 ]
Ou, Xue-Mei [1 ,2 ]
Zhang, Xiao-Hong [1 ,2 ]
机构
[1] Soochow Univ, Inst Funct Nano & Soft Mat FUNSOM, Suzhou 215123, Jiangsu, Peoples R China
[2] Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Suzhou 215123, Jiangsu, Peoples R China
[3] UESTC, Sch Optoelect Sci & Engn, Chengdu 610054, Sichuan, Peoples R China
来源
ADVANCED SCIENCE | 2018年 / 5卷 / 09期
基金
中国国家自然科学基金;
关键词
high external quantum efficiency; red organic light-emitting diodes; rigid segments; thermally activated delayed fluorescence; MOLECULAR DESIGN; ROLL-OFF; BLUE; TRIPLET; OLEDS; SINGLET; CONVERSION; DEVICES; ENERGY; HOSTS;
D O I
10.1002/advs.201800436
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A novel thermally activated delayed fluorescence (TADF) emitter 12,15-di(10H-phenoxazin-10-yl)dibenzo[a,c]dipyrido[3,2-h:2',3'-j]phenazine (DPXZ-BPPZ) is developed for a highly efficient red organic light-emitting diode (OLED). With rigid and planar constituent groups and evident steric hindrance between electron-donor (D) and electron-acceptor (A) segments, DPXZ-BPPZ realizes extremely high rigidity to suppress the internal conversion process. Meanwhile, the highly twisted structure between D and A segments will also lead to an extremely small singlet-triplet energy split to DPXZ-BPPZ. Therefore, DPXZ-BPPZ successfully realizes an efficient fluorescent radiation transition and reverse intersystem crossing process, and possesses an extremely high photoluminescence quantum efficiency of 97.1 +/- 1.1% under oxygen-free conditions. The OLED based on DPXZ-BPPZ shows red emission with a peak at 612 nm and a Commission Internationale de L'Eclairage (CIE) coordinate of (0.60, 0.40), and it achieves high maximum forward-viewing efficiencies of 20.1 +/- 0.2% (external quantum efficiency), 30.2 +/- 0.6 cd A(-1) (current efficiency), and 30.9 +/- 1.3 lm W-1 (power efficiency). The prepared OLED has the best performance among the reported red TADF OLEDs. These results prove that DPXZ-BPPZ is an ideal candidate for red TADF emitters, and the designing approach is valuable for highly efficient red TADF emitters.
引用
收藏
页数:7
相关论文
共 34 条
[1]   Singlet-Triplet Splitting Energy Management via Acceptor Substitution: Complanation Molecular Design for Deep-Blue Thermally Activated Delayed Fluorescence Emitters and Organic Light-Emitting Diodes Application [J].
Cai, Xinyi ;
Gao, Bin ;
Li, Xiang-Long ;
Cao, Yong ;
Su, Shi-Jian .
ADVANCED FUNCTIONAL MATERIALS, 2016, 26 (44) :8042-8052
[2]   Isomeric Thermally Activated Delayed Fluorescence Emitters for Color Purity-Improved Emission in Organic Light-Emitting Devices [J].
Chen, Dong-Yang ;
Liu, Wei ;
Zheng, Cai-Jun ;
Wang, Kai ;
Li, Fan ;
Tao, Si Lu ;
Ou, Xue-Mei ;
Zhang, Xiao-Hong .
ACS APPLIED MATERIALS & INTERFACES, 2016, 8 (26) :16791-16798
[3]   Modulation of Exciton Generation in Organic Active Planar pn Heterojunction: Toward Low Driving Voltage and High-Efficiency OLEDs Employing Conventional and Thermally Activated Delayed Fluorescent Emitters [J].
Chen, Dongcheng ;
Liu, Kunkun ;
Gan, Lin ;
Liu, Ming ;
Gao, Kuo ;
Xie, Gaozhan ;
Ma, Yuguang ;
Cao, Yong ;
Su, Shi-Jian .
ADVANCED MATERIALS, 2016, 28 (31) :6758-+
[4]   Coumarin-Based Thermally Activated Delayed Fluorescence Emitters with High External Quantum Efficiency and Low Efficiency Roll-off in the Devices [J].
Chen, Jia-Xiong ;
Liu, Wei ;
Zheng, Cai-Jun ;
Wang, Kai ;
Liang, Ke ;
Shi, Yi-Zhong ;
Ou, Xue-Mei ;
Zhang, Xiao-Hong .
ACS APPLIED MATERIALS & INTERFACES, 2017, 9 (10) :8848-8854
[5]   Dibenzo[a,j]phenazine-Cored Donor-Acceptor-Donor Compounds as Green-to-Red/NIR Thermally Activated Delayed Fluorescence Organic Light Emitters [J].
Data, Przemyslaw ;
Pander, Piotr ;
Okazaki, Masato ;
Takeda, Youhei ;
Minakata, Satoshi ;
Monkman, Andrew P. .
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2016, 55 (19) :5739-5744
[6]   Regio- and conformational isomerization critical to design of efficient thermally-activated delayed fluorescence emitters [J].
Etherington, Marc K. ;
Franchello, Flavio ;
Gibson, Jamie ;
Northey, Thomas ;
Santos, Jose ;
Ward, Jonathan S. ;
Higginbotham, Heather F. ;
Data, Przemyslaw ;
Kurowska, Aleksandra ;
Dos Santos, Paloma Lays ;
Graves, David R. ;
Batsanov, Andrei S. ;
Dias, Fernando B. ;
Bryce, Martin R. ;
Penfold, Thomas J. ;
Monkman, Andrew P. .
NATURE COMMUNICATIONS, 2017, 8
[7]   Organic light-emitting diodes employing efficient reverse intersystem crossing for triplet-to-singlet state conversion [J].
Goushi, Kenichi ;
Yoshida, Kou ;
Sato, Keigo ;
Adachi, Chihaya .
NATURE PHOTONICS, 2012, 6 (04) :253-258
[8]  
Hirata S, 2015, NAT MATER, V14, P330, DOI [10.1038/NMAT4154, 10.1038/nmat4154]
[9]   Molecular Design Strategy of Organic Thermally Activated Delayed Fluorescence Emitters [J].
Im, Yirang ;
Kim, Mounggon ;
Cho, Yong Joo ;
Seo, Jeong-A ;
Yook, Kyoung Soo ;
Lee, Jun Yeob .
CHEMISTRY OF MATERIALS, 2017, 29 (05) :1946-1963
[10]  
Josef K, 1995, EXCITED STATES PHOTO