High-efficiency deep-blue organic light-emitting diodes based on a thermally activated delayed fluorescence emitter

Shuanghong Wu, Masaki Aonuma, Qisheng Zhang, Shuping Huang, Tetsuya Nakagawa, Kazuhiro Kuwabara, Chihaya Adachi

Research output: Contribution to journalArticlepeer-review

216 Scopus citations

Abstract

Highly efficient deep-blue thermally activated delayed fluorescence (TADF) is observed from a charge-transfer compound bis[4-(3,6-dimethoxycarbazole) phenyl]sulfone (DMOC-DPS). In comparison with the previously reported carbazole/sulfone derivative with tert-butyl substituents on the carbazole donors, DMOC-DPS exhibits a much shorter excited-state lifetime in both an aromatic solution and an organic thin film, because the change of the substituent on the donor affects the molecular energy levels of the first singlet (S1) and triplet (T1) excited states in different ways, decreasing the energy gap between S1 and T1 (ΔEST). An organic light emitting diode (OLED) based on DMOC-DPS achieves a maximum external electroluminescence quantum efficiency (EQE) of 14.5% and reduced efficiency roll-off, with Commission Internationale de L'Eclairage (CIE) coordinates of (0.16, 0.16), owing to efficient exciton harvesting that occurs through triplet-to-singlet up-conversion.

Original languageEnglish (US)
Pages (from-to)421-424
Number of pages4
JournalJournal of Materials Chemistry C
Volume2
Issue number3
DOIs
StatePublished - Jan 21 2014

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