Novel V-Shaped Bipolar Host Materials for Solution-Processed Thermally Activated Delayed Fluorescence OLEDs

Dong Won Lee, Jinhyo Hwang, Hyung Jong Kim, Hyoseong Lee, Jung Min Ha, Han Young Woo, Sungnam Park, Min Ju Cho, Dong Hoon Choi

Research output: Contribution to journalArticlepeer-review

Abstract

Three V-shaped host molecules with a cyclohexane linker were successfully synthesized for thermally activated delayed fluorescence organic light-emitting diodes (TADF-OLEDs). The unipolar host molecules, BBCzC and BTDC, contained two 9-phenyl-9H-3,9′-bicarbazole (PBCz) moieties and two 2,12-di-tert-butyl-7-phenyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracene (PDBNA) moieties, respectively. BCzTC, a bipolar host molecule, consisted of a donor unit, PBCz, and an acceptor unit, PDBNA, connected by a cyclohexane linker. Three host molecules showed good solubility in various organic solvents, making them suitable for solution processing. Among the solution-processed green TADF-OLEDs using three host molecules and a green TADF emitter, the one with BCzTC showed the highest external quantum efficiency of up to 30% with a high power efficiency of 71 lm W-1 and a current efficiency of 102 cd A-1. Compared with BBCzC and BTDC, BCzTC exhibited a relatively high photoluminescence quantum yield (PLQY), an excellent balance in hole and electron transport properties in the emitting layer, and more efficient energy transfer to the emitter, giving such an excellent device performance.

Original languageEnglish
Pages (from-to)49076-49084
Number of pages9
JournalACS Applied Materials and Interfaces
Volume13
Issue number41
DOIs
Publication statusPublished - 2021 Oct 20

Keywords

  • bipolar host
  • nonconjugated molecule
  • organic light-emitting diode
  • solution process
  • thermally activated delayed fluorescence

ASJC Scopus subject areas

  • Materials Science(all)

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