Abstract

A material possessing a very small energy gap between its singlet and triplet excited states, ΔE1−3, 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 ΔE1−3 of just 0.11 eV, while maintaining a high fluorescent radiative decay rate (kr∼107). The intense TADF provides a pathway for highly efficient electroluminescence.

Keywords

ElectroluminescenceExcitonSinglet stateExcited statePhotochemistryCarbazoleOLEDFluorescenceTriplet stateBiphenylMaterials scienceSinglet fissionOptoelectronicsPhosphorescenceBand gapChemistryAtomic physicsPhysicsOpticsCondensed matter physicsNanotechnology

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Year
2011
Type
article
Volume
98
Issue
8
Citations
1130
Access
Closed

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Cite This

Ayataka Endo, Keigo Sato, Kazuaki Yoshimura et al. (2011). Efficient up-conversion of triplet excitons into a singlet state and its application for organic light emitting diodes. Applied Physics Letters , 98 (8) . https://doi.org/10.1063/1.3558906

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DOI
10.1063/1.3558906

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