Diboron compound-based organic light-emitting diodes with high efficiency and reduced efficiency roll-off

被引：732

作者：

Wu, Tien-Lin ^{[1
]}

Huang, Min-Jie ^{[1
]}

Lin, Chih-Chun ^{[1
]}

Huang, Pei-Yun ^{[1
]}

Chou, Tsu-Yu ^{[2
]}

Chen-Cheng, Ren-Wu ^{[2
]}

Lin, Hao-Wu ^{[2
]}

Liu, Rai-Shung ^{[1
]}

Cheng, Chien-Hong ^{[1
]}

机构：

[1] Natl Tsing Hua Univ, Dept Chem, Hsinchu, Taiwan

[2] Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu, Taiwan

来源：

NATURE PHOTONICS | 2018年 / 12卷 / 04期

关键词：

ACTIVATED DELAYED FLUORESCENCE; EXTERNAL QUANTUM EFFICIENCY; MOLECULAR DESIGN; PURE BLUE; BORON; COMPLEXES; SINGLET; ELECTROLUMINESCENCE; EXCITONS; 9,10-DIHYDRO-9,10-DIBORAANTHRACENES;

D O I：

10.1038/s41566-018-0112-9

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Organic light-emitting diodes (OLEDs) based on thermally activated delayed fluorescence (TADF) materials are promising for the realization of highly efficient light emitters. However, such devices have so far suffered from efficiency roll-off at high luminance. Here, we report the design and synthesis of two diboron-based molecules, CzDBA and tBuCzDBA, which show excellent TADF properties and yield efficient OLEDs with very low efficiency roll-off. These donor-acceptor-donor (D-A-D) type and rodlike compounds concurrently generate TADF with a photoluminescence quantum yield of similar to 100% and an 84% horizontal dipole ratio in the thin film. A green OLED based on CzDBA exhibits a high external quantum efficiency of 37.8 +/- 0.6%, a current efficiency of 139.6 +/- 2.8 cd A(-1) and a power efficiency of 121.6 +/- 3.1 lm W-1 with an efficiency roll-off of only 0.3% at 1,000 cd m(-2). The device has a peak emission wavelength of 528 nm and colour coordinates of the Commission International de l' Eclairage (CIE) of (0.31, 0.61), making it attractive for colour-display applications.

引用

页码：235 / +

页数：7

共 44 条

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