Cyclohexane-coupled bipolar host materials with high triplet energies for organic light-emitting diodes based on thermally activated delayed fluorescence

In Seob Park, Hongwook Seo, Hiroki Tachibana, Joung Uk Kim, Jinbo Zhang, Se Mo Son, Takuma Yasuda

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Thermally activated delayed fluorescence-based organic light-emitting diodes (TADF-OLEDs) have recently attracted tremendous research interest as next-generation optoelectronic devices. However, there are a limited number of host materials with an appropriately high lowest-excited triplet energy (ET) and bipolar charge transport properties for highefficiency TADF-OLEDs. Moreover, these host materials should have high thermal and morphological stabilities. In this study, we develop novel bipolar host materials consisting of an electrondonating 9-phenylcarbazole unit and an electron-Accepting triphenylphosphine oxide, triphenylphosphine sulfide, or 2,4,6-triphenyl-1,3,5-Triazine unit linked by a nonconjugated cyclohexane core. These bipolar host materials possess high glasstransition temperatures of over 100 °C and high ET values of approximately 3.0 eV. TADF-OLEDs employing these bipolar host materials could achieve high external electroluminescence quantum efficiencies of up to 21.7% together with reduced efficiency roll-off characteristics, because of expansion of the chargerecombination zone within the emission layer arising from the bipolar charge transport ability of these host materials.

Original languageEnglish
Pages (from-to)2693-2700
Number of pages8
JournalACS Applied Materials and Interfaces
Volume9
Issue number3
DOIs
Publication statusPublished - Jan 25 2017

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Organic light emitting diodes (OLED)
Cyclohexane
Fluorescence
Charge transfer
Triazines
Electroluminescence
Sulfides
Quantum efficiency
Optoelectronic devices
Transport properties
Oxides
Electrons

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Cyclohexane-coupled bipolar host materials with high triplet energies for organic light-emitting diodes based on thermally activated delayed fluorescence. / Park, In Seob; Seo, Hongwook; Tachibana, Hiroki; Kim, Joung Uk; Zhang, Jinbo; Son, Se Mo; Yasuda, Takuma.

In: ACS Applied Materials and Interfaces, Vol. 9, No. 3, 25.01.2017, p. 2693-2700.

Research output: Contribution to journalArticle

Park, In Seob ; Seo, Hongwook ; Tachibana, Hiroki ; Kim, Joung Uk ; Zhang, Jinbo ; Son, Se Mo ; Yasuda, Takuma. / Cyclohexane-coupled bipolar host materials with high triplet energies for organic light-emitting diodes based on thermally activated delayed fluorescence. In: ACS Applied Materials and Interfaces. 2017 ; Vol. 9, No. 3. pp. 2693-2700.
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