Triplet-triplet annihilation in a thermally activated delayed fluorescence emitter lightly doped in a host

被引：19

作者：

Niwa, Akitsugu ^{[1
]}

Haseyama, Shota ^{[1
]}

Kobayashi, Takashi ^{[1
,2
]}

Nagase, Takashi ^{[1
,2
]}

Goushi, Kenichi ^{[3
,4
,5
]}

Adachi, Chihaya ^{[3
,4
,5
]}

Naito, Hiroyoshi ^{[1
,2
]}

机构：

[1] Osaka Prefecture Univ, Dept Phys & Elect, Sakai, Osaka 5998531, Japan

[2] Osaka Prefecture Univ, Res Inst Mol Elect Devices, Sakai, Osaka 5998531, Japan

[3] Kyushu Univ, Ctr Organ Photon & Elect Res, Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan

[4] Japan Sci & Technol Agcy JST, ERATO, Adachi Mol Exciton Engn Project, Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan

[5] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan

来源：

APPLIED PHYSICS LETTERS | 2018年 / 113卷 / 08期

关键词：

EXCITON ANNIHILATION; DIODES; DEPENDENCE; DIFFUSION; MECHANISM; DEVICES;

D O I：

10.1063/1.5025870

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Triplet-triplet annihilation (TTA) will change the ratio between fluorescence and phosphorescence in the photoluminescence spectrum of a thermally activated delayed fluorescence emitter at very low temperature. Using the resultant spectral blueshift, this study investigated the nature of TTA in 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN) doped in a host material. The spectral blueshift is not caused by singlet-triplet annihilation and the emitter saturation effect and is less influenced by the emitter aggregates, particularly for the case of a lower doping concentration. Using these features, it is possible to focus on TTA. For 4CzIPN, the spectral blueshift due to TTA is recognized even in samples with the doping concentration as low as 1 wt. %. Published by AIP Publishing.

引用

页数：5

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