Meta-linking strategy for thermally activated delayed fluorescence emitters with a small singlet-triplet energy gap

Katsuyuki Shizu, Yumi Sakai, Hiroyuki Tanaka, Shuzo Hirata, Chihaya Adachi, Hironori Kaji

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Thermally activated delayed fluorescence (TADF) emitters have recently attracted considerable attention as dopants for organic light-emitting diodes (OLEDs), and are considered promising alternatives to fluorescent and phosphorescent dopants. TADF emitters require a small singlet-triplet energy gap (?EST). This study presents a molecular design strategy to achieve a small ?EST. An electroluminescent dopant containing two electron-donating carbazolyl groups and an electron-accepting triphenyltriazine, m-bisCzTRZ, was prepared. The electron-donating moieties were introduced at the meta positions of the two phenyl rings in triphenyltriazine. Transient photoluminescence decay measurements confirmed that m-bisCzTRZ emitted blue TADF in a solid-state host layer and thus it showed promise as a blue dopant. The experimental ?EST value for m-bisCzTRZ was small (0.09 eV), as determined from fluorescence and phosphorescence spectra of a mbisCzTRZ- doped host. These observations suggested that the use of meta-linked electron-donating and electronaccepting units could be a useful strategy to obtain TADF emitters.

Original languageEnglish
Pages (from-to)108-113
Number of pages6
JournalITE Transactions on Media Technology and Applications
Volume3
Issue number2
DOIs
Publication statusPublished - 2015

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Media Technology
  • Computer Graphics and Computer-Aided Design

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