Organic luminescent molecule with energetically equivalent singlet and triplet excited states for organic light-emitting diodes

Keigo Sato, Katsuyuki Shizu, Kazuaki Yoshimura, Atsushi Kawada, Hiroshi Miyazaki, Chihaya Adachi

Research output: Contribution to journalArticlepeer-review

175 Citations (Scopus)

Abstract

We demonstrate an organic molecule with an energy gap between its singlet and triplet excited states of almost zero (ΔEST∼0 eV). Such separation was realized through proper combination of an electron-donating indolocarbazole group and a diphenyltriazine electron-accepting moiety. Calculated and measured ΔEST 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 ηEQE=14%±1%.

Original languageEnglish
Article number247401
JournalPhysical review letters
Volume110
Issue number24
DOIs
Publication statusPublished - Jun 10 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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