Oxadiazole- and triazole-based highly-efficient thermally activated delayed fluorescence emitters for organic light-emitting diodes

被引：315

作者：

Lee, Jiyoung ^{[1
]}

Shizu, Katsuyuki ^{[2
]}

Tanaka, Hiroyuki ^{[2
]}

Nomura, Hiroko ^{[2
]}

Yasuda, Takuma ^{[1
,2
,3
]}

Adachi, Chihaya ^{[2
,3
]}

机构：

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

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

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

来源：

JOURNAL OF MATERIALS CHEMISTRY C | 2013年 / 1卷 / 30期

关键词：

ELECTROLUMINESCENCE; DEVICES; APPROXIMATION; DYES;

D O I：

10.1039/c3tc30699b

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We developed highly-efficient thermally activated delayed fluorescence (TADF) emitters containing 2,5-diphenyl-1,3,4-oxadiazole (OXD) or 3,4,5-triphenyl-4H-1,2,4-triazole (TAZ) electron acceptor and phenoxazine (PXZ) electron donor moieties. Oxadiazole-based compounds PXZ-OXD and 2PXZ-OXD showed green emission, while the triazole-based ones PXZ-TAZ and 2PXZ-TAZ exhibited sky-blue emission. In toluene solution, the donor-acceptor-donor-type molecules 2PXZ-OXD and 2PXZ-TAZ showed more efficient TADF and higher photoluminescence quantum yields (PLQYs) than the donor-acceptor-type molecules PXZ-OXD and PXZ-TAZ. When doped into a host material, 2PXZ-OXD displayed a high PLQY of 87%. An organic light-emitting diode using 2PXZ-OXD as an emitter exhibited an external quantum efficiency (EQE) of 14.9%, which exceeds those obtained with conventional fluorescent emitters. This high EQE results from the efficient generation of TADF in 2PXZ-OXD.

引用

页码：4599 / 4604

页数：6

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