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Pentacyclic Ladder-Heteraborin Emitters Exhibiting High-Efficiency Blue Thermally Activated Delayed Fluorescence with an Ultrashort Emission Lifetime AITranslate

Tomohiro Agou; Kyohei Matsuo; Rei Kawano; In Seob Park; Takaaki Hosoya; Hiroki Fukumoto; Toshio Kubota; Yoshiyuki Mizuhata; Norihiro Tokitoh; Takuma Yasuda;
Ibaraki University; Kyushu University; Ibaraki University; Kyushu University; Ibaraki University; Ibaraki University; Ibaraki University; Kyoto University; Kyoto University; Kyushu University
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Publisher: ACS
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Abstract AITranslate

As one of the three primary colors, blue is significant for display and lighting applications and the development of blue-emitting molecules with high quantum efficiency, and color purity for organic light-emitting diodes (OLEDs) remains a key challenge. Herein, a new series of blue thermally activated delayed fluorescence (TADF) materials featuring π-extended ladder-oxaborin and thiaborin acceptors has been developed. Steady-state and time-resolved photophysical measurements revealed the advantages of the ladder-oxaborin emitter, including a tiny singlet–triplet energy splitting of 10 meV, an ideal photoluminescence quantum yield of 100%, and an ultrashort TADF lifetime of 780 ns. The TADF-OLEDs incorporating the ladder-oxaborin (deep-blue) and thiaborin (sky-blue) emitters achieved significantly high external electroluminescence quantum efficiencies of up to 20.1% and 25.9%, respectively, accompanied by suppressed efficiency roll-offs.

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DOI：https://doi.org/10.1021/acsmaterialslett.9b00433

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Citation Information:

As one of the three primary colors, blue is significant for display and lighting applications and the development of blue-emitting molecules with high quantum efficiency, and color purity for organic light-emitting diodes (OLEDs) remains a key challenge. Herein, a new series of blue thermally activated delayed fluorescence (TADF) materials featuring π-extended ladder-oxaborin and thiaborin acceptors has been developed. Steady-state and time-resolved photophysical measurements revealed the advantages of the ladder-oxaborin emitter, including a tiny singlet–triplet energy splitting of 10 meV, an ideal photoluminescence quantum yield of 100%, and an ultrashort TADF lifetime of 780 ns. The TADF-OLEDs incorporating the ladder-oxaborin (deep-blue) and thiaborin (sky-blue) emitters achieved significantly high external electroluminescence quantum efficiencies of up to 20.1% and 25.9%, respectively, accompanied by suppressed efficiency roll-offs.

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GB/T 7714-2015 [1] Tomohiro Agou, Kyohei Matsuo, Rei Kawano, et al. ACS Materials Letters, 2020(2). DOI:10.1021/acsmaterialslett.9b00433.
MLA [1] Tomohiro Agou, et al., ACS Materials Letters, no. 2, 2020, https://doi.org/10.1021/acsmaterialslett.9b00433.
APA [1] Tomohiro Agou, Kyohei Matsuo, Rei Kawano, In Seob Park, Takaaki Hosoya, Hiroki Fukumoto, Toshio Kubota, Yoshiyuki Mizuhata, Norihiro Tokitoh, & Takuma Yasuda. (2020). ACS Materials Letters(2). https://doi.org/10.1021/acsmaterialslett.9b00433
IEEE [1] Tomohiro Agou, Kyohei Matsuo, Rei Kawano, In Seob Park, Takaaki Hosoya, Hiroki Fukumoto, Toshio Kubota, Yoshiyuki Mizuhata, Norihiro Tokitoh, and Takuma Yasuda, ACS Materials Letters, no. 2, 2020, doi: 10.1021/acsmaterialslett.9b00433.