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

Akitsugu Niwa; Shota Haseyama; Takashi Kobayashi; Takashi Nagase; Kenichi Goushi; Chihaya Adachi; Hiroyoshi Naito

doi:10.1063/1.5025870

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

Akitsugu Niwa, Shota Haseyama, Takashi Kobayashi, Takashi Nagase, Kenichi Goushi, Chihaya Adachi, Hiroyoshi Naito

Applied Chemistry

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

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. %.

Original language	English
Article number	083301
Journal	Applied Physics Letters
Volume	113
Issue number	8
DOIs	https://doi.org/10.1063/1.5025870
Publication status	Published - Aug 20 2018

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.5025870

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title = "Triplet-triplet annihilation in a thermally activated delayed fluorescence emitter lightly doped in a host",

abstract = "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. %.",

author = "Akitsugu Niwa and Shota Haseyama and Takashi Kobayashi and Takashi Nagase and Kenichi Goushi and Chihaya Adachi and Hiroyoshi Naito",

note = "Funding Information: This work was supported in part by JSPS KAKENHI Grant Nos. JP18H03902, JP17H01265, JP17K18993, JP15H03883, and JP15J12038.",

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doi = "10.1063/1.5025870",

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T1 - Triplet-triplet annihilation in a thermally activated delayed fluorescence emitter lightly doped in a host

AU - Niwa, Akitsugu

AU - Haseyama, Shota

AU - Kobayashi, Takashi

AU - Nagase, Takashi

AU - Goushi, Kenichi

AU - Adachi, Chihaya

AU - Naito, Hiroyoshi

N1 - Funding Information: This work was supported in part by JSPS KAKENHI Grant Nos. JP18H03902, JP17H01265, JP17K18993, JP15H03883, and JP15J12038.

PY - 2018/8/20

Y1 - 2018/8/20

N2 - 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. %.

AB - 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. %.

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ER -

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

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