Donor-acceptor-structured 1,4-diazatriphenylene derivatives exhibiting thermally activated delayed fluorescence: design and synthesis, photophysical properties and OLED characteristics

被引：65

作者：

Takahashi, Takehiro ^{[1
,2
]}

Shizu, Katsuyuki ^{[1
]}

Yasuda, Takuma ^{[1
,3
,4
,5
]}

Togashi, Kazunori ^{[1
,2
]}

Adachi, Chihaya ^{[1
,3
,4
]}

机构：

[1] Kyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 812, Japan

[2] Hodogaya Chem Co, Tsukuba, Ibaraki, Japan

[3] Kyushu Univ, Dept Appl Chem, Fukuoka 812, Japan

[4] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Fukuoka 812, Japan

[5] Japan Sci & Technol Agcy JST, PRESTO, Chiyoda Ku, Tokyo 1020076, Japan

来源：

SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS | 2014年 / 15卷 / 03期

关键词：

organic light-emitting diodes; 1,4-diazatriphenylene; thermally activated delayed fluorescence; donor-acceptor; LIGHT-EMITTING-DIODES; HOST MATERIALS; ENERGY; APPROXIMATION; EFFICIENCY; POLYMERS; STATES;

D O I：

10.1088/1468-6996/15/3/034202

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A new series of luminescent 1,4-diazatriphenylene (ATP) derivatives with various peripheral donor units, including phenoxazine, 9,9-dimethylacridane and 3-(diphenylamino)carbazole, is synthesized and characterized as thermally activated delayed fluorescence (TADF) emitters. The influence of the donor substituents on the electronic and photophysical properties of the materials is investigated by theoretical calculations and experimental spectroscopic measurements. These ATP-based molecules with donor-acceptor-donor (D-A-D) structures can reduce the singlet-triplet energy gap (0.04-0.26 eV) upon chemical modification of the ATP core, and thus exhibit obvious TADF characteristics in solution and doped thin films. As a demonstration of the potential of these materials, organic light-emitting diodes containing the D-A-D-structured ATP derivatives as emitters are fabricated and tested. External electroluminescence quantum efficiencies above 12% and 8% for green- and sky-blue-emitting devices, respectively, are achieved.

引用

页数：10

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