High-efficiency solution-processed green thermally activated delayed fluorescence OLEDs using a polymer-small molecule mixed host

Seunguk Cho, Na Yeon Kwon, Chai Won Kim, Hyoseong Lee, Jung Min Ha, Hyung Jong Kim, Han Young Woo, Sungnam Park, Min Ju Cho, Dong Hoon Choi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The development of suitable host materials for application to an emitter is of significant importance for high-efficiency organic light-emitting diodes (OLEDs). In this study, we successfully synthesized poly(9,9-diphenyl-10-(4-vinylbenzyl)-9,10-dihydroacridine) (P(Bn-DPAc)) as a polymer donor and 2-(4′-(tert-butyl)-[1,1′-biphenyl]-4-yl)-4,6-diphenyl-1,3,5-triazine (tPTRZ) as a small-molecule acceptor. A blend of P(Bn-DPAc) and tPTRZ was used as the host material in solution-processed green thermally activated delayed fluorescence OLEDs (TADF-OLEDs). The P(Bn-DPAc)-tPTRZ blend showed a new red-shifted peak in the photoluminescence spectrum, suggesting the possibility of exciplex formation. The polymer-mixed host film showed a fine surface morphology, a well-formed exciplex in the bulk state, and good charge balance. The OLED fabricated with the as-prepared mixed host (P(Bn-DPAc) : tPTRZ = 1 : 1 wt ratio) and 2,4,5,6-tetra(3,6-di-tert-butylcarbazol-9-yl)-1,3-dicyanobenzene (t4CzIPN) emitter exhibited a high current efficiency of 107.3 cd A−1 and a maximum external quantum efficiency (EQE) of 31.2%. The OLED fabricated with the mixed host demonstrated better performance compared to the device with a unipolar host P(Bn-DPAc).

Original languageEnglish
Pages (from-to)1824-1830
Number of pages7
JournalPolymer Chemistry
Volume13
Issue number13
DOIs
Publication statusPublished - 2022 Feb 25

ASJC Scopus subject areas

  • Bioengineering
  • Biochemistry
  • Organic Chemistry
  • Polymers and Plastics

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