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Updated: Apr 25, 2026

Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
Published on: November 16, 2018
Organic luminescent molecule with energetically equivalent singlet and triplet excited states for organic
Keigo Sato1, Katsuyuki Shizu1, Kazuaki Yoshimura2
1Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, 744 Motooka, Nishi, Fukuoka 819-0395, Japan.
Abstract:
We demonstrate an organic molecule with an energy gap between its singlet and triplet excited states of almost zero (ΔE(ST) ∼ 0 eV). Such separation was realized through proper combination of an electron-donating indolocarbazole group and a diphenyltriazine electron-accepting moiety. Calculated and measured ΔE(ST) were 0.003 and 0.02 eV, respectively. A total photoluminescence efficiency of 59% ± 2% with 45% ± 2% from a delayed component and 14% ± 2% from a prompt component was obtained for a doped film. Organic light emitting diodes containing this molecule as an emitting dopant exhibited an unexpectedly high external electroluminescence efficiency of η(EQE) = 14% ± 1%.
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