Controlled emission colors and singlet-triplet energy gaps of dihydrophenazine-based thermally activated delayed fluorescence emitters

被引：145

作者：

Lee, Jiyoung ^{[1
]}

Shizu, Katsuyuki ^{[2
,3
]}

Tanaka, Hiroyuki ^{[2
]}

Nakanotani, Hajime ^{[2
,4
]}

Yasuda, Takuma ^{[1
,2
,5
]}

Kaji, Hironori ^{[3
]}

Adachi, Chihaya ^{[2
,5
]}

机构：

[1] Kyushu Univ, Grad Sch Integrated Frontier Sci, Dept Automot Sci, Nishi Ku, Fukuoka 8190395, Japan

[2] Kyushu Univ, Ctr Organ Photon & Elect Res OPERA, Nishi Ku, Fukuoka 8190395, Japan

[3] Kyoto Univ, Inst Chem Res, Uji, Kyoto 6110011, Japan

[4] Inst Syst Informat Technol & Nanotechnol ISIT, Innovat Organ Device Lab, Nishi Ku, Fukuoka 8190395, Japan

[5] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Nishi Ku, Fukuoka 8190395, Japan

来源：

JOURNAL OF MATERIALS CHEMISTRY C | 2015年 / 3卷 / 10期

基金：

日本学术振兴会;

关键词：

LIGHT-EMITTING-DIODES; BLUE; ELECTROLUMINESCENCE; EFFICIENCY; OLEDS; APPROXIMATION; COMPLEXES; TRANSPORT; STATES; HOSTS;

D O I：

10.1039/c4tc02530j

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have developed thermally activated delayed fluorescence (TADF) emitters containing 5,10-ihydrophenazine as an electron donor and various electron-acceptor units. The TADF emitters exhibit wide ranges of emission colors from green to orange, singlet-triplet energy gaps Delta E-ST of similar to 0-0.19 eV, and delayed fluorescence lifetimes tau(d) of 0.1-50 mu s. An organic light-emitting diode containing one of the TADF emitters exhibits a maximum external quantum efficiency (EQE) of 12%, which is higher than those obtained with conventional fluorescent emitters. Time-resolved photoluminescence measurements of the compounds in a host matrix reveal that TADF makes a large contribution to the EQE of the devices. Our findings provide guidelines for modulating Delta E-ST and tau(d) of TADF emitters.

引用

页码：2175 / 2181

页数：7

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