Precision-Engineered Medium-Sized Molecular Host and Emitter for Ensuring Consistent Performance in Solution-Processed Narrowband OLEDs

Jin Young Park, Na Yeon Kwon, Chang Woo Koh, Su Hong Park, Min Ji Kang, Haeun Kwak, Chae Yeong Park, Weon Sik Chae, Chang Seop Hong, Sungnam Park, Min Ju Cho, Dong Hoon Choi

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, two novel multiple resonance (MR) emitters, DtCzBN and Cy-DtCzBN, were designed based on the well-known BCzBN structure and synthesized for narrowband solution-processed organic light-emitting diodes (OLEDs). Cy-DtCzBN possesses a dimeric V-shaped structure formed by coupling two individual DtCzBN units via a nonconjugated cyclohexane linker. When compared with DtCzBN, Cy-DtCzBN, as a medium-sized molecule, was found to maintain the optical and photophysical properties of the corresponding monomeric unit, DtCzBN, but exhibits high thermal stability, excellent solubility, and good film-forming ability. Additionally, solution-processed OLEDs were fabricated by using two sets of molecules: one set of small molecular hosts and emitters (i.e., mCP and DtCzBN) and the other set of medium-sized molecular hosts and emitters (i.e., Cy-mCP and Cy-DtCzBN). Notably, devices using medium-sized molecular hosts and emitters exhibited similar optical and photophysical properties but showed significantly improved reproducibility and thermal stability compared with those based on small molecular hosts and emitters. Our current study provides some insights into molecular design strategies for thermally stable hosts and emitters, which are highly suitable for solution-processed OLEDs.

Original languageEnglish
Pages (from-to)16553-16562
Number of pages10
JournalACS Applied Materials and Interfaces
Volume16
Issue number13
DOIs
Publication statusPublished - 2024 Apr 3

Bibliographical note

Publisher Copyright:
© 2024 American Chemical Society.

Keywords

  • medium-sized molecules
  • multiple resonance
  • nonconjugated linker
  • organic light-emitting diode
  • solution process

ASJC Scopus subject areas

  • General Materials Science

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