Solution-processed thermally activated delayed fluorescence organic light-emitting diodes using a new polymeric emitter containing non-conjugated cyclohexane units

Hyung Jong Kim, Chiho Lee, Mallesham Godumala, Suna Choi, Seo Yeon Park, Min Ju Cho, Sungnam Park, Dong Hoon Choi

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The importance of thermally activated delayed fluorescence (TADF) materials in organic light-emitting diode (OLED) applications continues to grow as a consequence of their unique properties and excellent performance. Herein, a new green-emitting TADF polymer, P(DMTRZ-Cp), for solution-processable OLEDs was designed and synthesized based on the structure of DMAC-TRZ that shows typical TADF characteristics as a small molecule. The 1,1-diphenylcyclohexane (Cp) moiety introduced into the structure of the polymeric emitter not only acts as a linker between the conjugated monomeric units, but also helps enhancing solubility while disconnecting conjugation along the polymer backbones. P(DMTRZ-Cp) exhibits obvious TADF features such as a small energy gap (0.023 eV) between its lowest singlet and triplet excited states, and obvious delayed photoluminescence (PL) decay behavior. Moreover, this new polymeric emitter exhibits high PL quantum yield over 90% in the film state. By applying solution-processed TADF-OLED devices, P(DMTRZ-Cp) exhibited the maximum external quantum efficiency of up to 15.4% with green emission. As far as we know, this is the first report to introduce a non-conjugated linker, Cp, in the main-chain type polymeric emitter structure that presents TADF characteristics. The Cp linker is considered to be a promising moiety for the development of solution-processable polymeric emitters with high efficiencies.

Original languageEnglish
Pages (from-to)1318-1326
Number of pages9
JournalPolymer Chemistry
Volume9
Issue number11
DOIs
Publication statusPublished - 2018 Mar 21

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Organic light emitting diodes (OLED)
Cyclohexane
Fluorescence
Light
Photoluminescence
Polymers
Quantum yield
Quantum efficiency
Excited states
Solubility
Energy gap
Equipment and Supplies
Molecules

ASJC Scopus subject areas

  • Bioengineering
  • Biochemistry
  • Polymers and Plastics
  • Organic Chemistry

Cite this

Solution-processed thermally activated delayed fluorescence organic light-emitting diodes using a new polymeric emitter containing non-conjugated cyclohexane units. / Kim, Hyung Jong; Lee, Chiho; Godumala, Mallesham; Choi, Suna; Park, Seo Yeon; Cho, Min Ju; Park, Sungnam; Choi, Dong Hoon.

In: Polymer Chemistry, Vol. 9, No. 11, 21.03.2018, p. 1318-1326.

Research output: Contribution to journalArticle

Kim, Hyung Jong ; Lee, Chiho ; Godumala, Mallesham ; Choi, Suna ; Park, Seo Yeon ; Cho, Min Ju ; Park, Sungnam ; Choi, Dong Hoon. / Solution-processed thermally activated delayed fluorescence organic light-emitting diodes using a new polymeric emitter containing non-conjugated cyclohexane units. In: Polymer Chemistry. 2018 ; Vol. 9, No. 11. pp. 1318-1326.
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