Efficient up-conversion of triplet excitons into a singlet state and its application for organic light emitting diodes

Ayataka Endo, Keigo Sato, Kazuaki Yoshimura, Takahiro Kai, Atsushi Kawada, Hiroshi Miyazaki, Chihaya Adachi

Research output: Contribution to journalArticle

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Abstract

A material possessing a very small energy gap between its singlet and triplet excited states, Δ E1-3, which allows efficient up-conversion of triplet excitons into a singlet state and leads to efficient thermally activated delayed fluorescence (TADF), is reported. The compound, 2-biphenyl-4,6-bis(12-phenylindolo[2,3-a] carbazole-11-yl)-1,3,5-triazine, breaks the restriction of a large energy gap, with a Δ E1-3of just 0.11 eV, while maintaining a high fluorescent radiative decay rate (k r ∼ 107). The intense TADF provides a pathway for highly efficient electroluminescence.

Original languageEnglish
Article number083302
JournalApplied Physics Letters
Volume98
Issue number8
DOIs
Publication statusPublished - Feb 21 2011

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light emitting diodes
excitons
fluorescence
carbazoles
electroluminescence
decay rates
constrictions
excitation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Efficient up-conversion of triplet excitons into a singlet state and its application for organic light emitting diodes. / Endo, Ayataka; Sato, Keigo; Yoshimura, Kazuaki; Kai, Takahiro; Kawada, Atsushi; Miyazaki, Hiroshi; Adachi, Chihaya.

In: Applied Physics Letters, Vol. 98, No. 8, 083302, 21.02.2011.

Research output: Contribution to journalArticle

Endo, Ayataka ; Sato, Keigo ; Yoshimura, Kazuaki ; Kai, Takahiro ; Kawada, Atsushi ; Miyazaki, Hiroshi ; Adachi, Chihaya. / Efficient up-conversion of triplet excitons into a singlet state and its application for organic light emitting diodes. In: Applied Physics Letters. 2011 ; Vol. 98, No. 8.
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