[Paper] Meta-linking Strategy for Thermally Activated Delayed Fluorescence Emitters with a Small Singlet-Triplet Energy Gap

• Shizu Katsuyuki

  Institute for Chemical Research, Kyoto University Center for Organic Photonics and Electronics Research (OPERA), Kyushu University Japan Science and Technology Agency (JST), ERATO, Adachi Molecular Exciton Engineering Project

• Sakai Yumi

  Center for Organic Photonics and Electronics Research (OPERA), Kyushu University

• Tanaka Hiroyuki

  Center for Organic Photonics and Electronics Research (OPERA), Kyushu University

• Hirata Shuzo

  Center for Organic Photonics and Electronics Research (OPERA), Kyushu University

• Adachi Chihaya

  Center for Organic Photonics and Electronics Research (OPERA), Kyushu University Japan Science and Technology Agency (JST), ERATO, Adachi Molecular Exciton Engineering Project International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University

• Kaji Hironori

  Institute for Chemical Research, Kyoto University

抄録

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 (ΔE_ST). This study presents a molecular design strategy to achieve a small ΔE_ST. 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 ΔE_ST value for m-bisCzTRZ was small (0.09 eV), as determined from fluorescence and phosphorescence spectra of a m-bisCzTRZ-doped host. These observations suggested that the use of meta-linked electron-donating and electron-accepting units could be a useful strategy to obtain TADF emitters.

収録刊行物

• 映像情報メディア学会英語論文誌

  映像情報メディア学会英語論文誌 3 (2), 108-113, 2015

  一般社団法人 映像情報メディア学会

キーワード

• Organic Light-Emitting Diode
• Thermally Activated Delayed Fluorescence
• <i>Meta</i> Linkage

詳細情報

• CRID: 1390001205424408064
• NII論文ID: 130005064337
• DOI: 10.3169/mta.3.108
• ISSN: 21867364
• Web Site: https://www.jstage.jst.go.jp/article/mta/3/2/3_108/_pdf
• 本文言語コード: en
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