Efficient Deep-Blue Organic Light-Emitting Diodes Employing Doublet Sensitization

被引：0

作者：

Sun, Yu-Fu ^{[1
,2
,3
,4
]}

Chen, Xu-Lin ^{[1
,2
]}

Zhang, Dong-Hai ^{[1
,2
]}

Huo, Peihao ^{[5
]}

Liu, Zhiwei ^{[5
]}

Zhou, Liang ^{[6
]}

Lin, Fu-Lin ^{[1
,2
]}

Lu, Can-Zhong ^{[1
,2
,3
,4
]}

机构：

[1] Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China

[2] Chinese Acad Sci, Xiamen Inst Rare Earth Mat, Haixi Inst, Xiamen Key Lab Rare Earth Photoelect Funct Mat, Xiamen 361021, Fujian, Peoples R China

[3] Chinese Acad Sci, Ganjiang Innovat Acad, Ganzhou 341119, Peoples R China

[4] Univ Sci & Technol China, Sch Rare Earths, Hefei 230026, Peoples R China

[5] Peking Univ, State Key Lab Rare Earth Mat Chem & Applicat, Beijing Engn Technol Res Ctr Act Display, Beijing Natl Lab Mol Sci BNLMS,Coll Chem & Mol Eng, Beijing 100871, Peoples R China

[6] Chinese Acad Sci, State Key Lab Rare Earth Resource Utilizat, Changchun Inst Appl Chem, Changchun 130022, Peoples R China

来源：

ADVANCED MATERIALS | 2024年

基金：

中国国家自然科学基金;

关键词：

doublet-sensitized fluorescence; deep-blue emission; organic light-emitting diodes; thermally activated delayed fluorescence; ultrafast and efficient energy transfer; EMITTERS;

D O I：

10.1002/adma.202408118

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Fast and efficient exciton utilization is a crucial solution and highly desirable for achieving high-performance blue organic light-emitting diodes (OLEDs). However, the rate and efficiency of exciton utilization in traditional OLEDs, which employ fully closed-shell materials as emitters, are inevitably limited by spin statistical limitations and transition prohibition. Herein, a new sensitization strategy, namely doublet-sensitized fluorescence (DSF), is proposed to realize high-performance deep-blue electroluminescence. In the DSF-OLED, a doublet-emitting cerium(III) complex, Ce-2, is utilized as sensitizer for multi-resonance thermally activated delayed fluorescence emitter nu-DABNA. Experimental results reveal that holes and electrons predominantly recombine on Ce-2 to form doublet excitons, which subsequently transfer energy to the singlet state of nu-DABNA via exceptionally fast (over 108 s-1) and efficient (approximate to 100%) F & ouml;rster resonance energy transfer for deep-blue emission. Due to the circumvention of spin-flip in the DSF mechanism, near-unit exciton utilization efficiency and remarkably short exciton residence time of 1.36 mu s are achieved in the proof-of-concept deep-blue DSF-OLED, which achieves a Commission Internationale de l'Eclairage coordinate of (0.13, 0.14), a high external quantum efficiency of 30.0%, and small efficiency roll-off of 14.7% at a luminance of 1000 cd m-2. The DSF device exhibits significantly improved operational stability compared with unsensitized reference device. Due to the circumvention of spin-flip in a new device concept, namely doublet-sensitized fluorescence, near-unit exciton utilization efficiency and remarkably short exciton residence time of 1.3 mu s are achieved. Fast (over 108 s-1) and efficient (approximate to 100%) exciton utilization enables high-performance deep-blue organic light-emitting diodes with a high external quantum efficiency of 30.0% and a small efficiency roll-off of 14.7%. image

引用

页数：9

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