Eco-friendly solution-processed narrowband OLEDs using non-halogenated aliphatic solvent systems

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

Research output: Contribution to journalArticlepeer-review

Abstract

In general, fabricating multilayer structures in solution-processed organic light-emitting diodes (OLEDs) presents challenges owing to the potential degradation of the initial film during subsequent processing steps. Furthermore, these devices typically require aromatic and halogenated solvents recognized for their adverse effects on human health and their harmful environmental impact. In this study, we successfully synthesized a solution-processable multi-resonance thermally activated delayed fluorescence (MR-TADF) emitter by introducing tert-butyl carbazolyl dendron, which exhibits excellent solubility. In our approach, we fabricated a multilayer OLED for solution processing utilizing eco-friendly, non-halogenated aliphatic solvents, with each layer in the devices developed utilizing water, cyclohexanone, and ethyl acetate for the hole injection layer, hole transport layer, and emitting layer, respectively. The resulting eco-friendly solution-processed OLED achieved a maximum external quantum efficiency (EQEmax) of 14.0 % and a narrow bandwidth of 30 nm. Furthermore, utilizing an additional TADF sensitizer led to a remarkable EQEmax enhancement of over 15 % and a substantial improvement in efficiency roll-off. Thus, the eco-friendly device fabrication strategy employed here opens novel avenues for diverse research in organic semiconductor devices that must be fabricated with solution processes in the future.

Original languageEnglish
Article number148484
JournalChemical Engineering Journal
Volume481
DOIs
Publication statusPublished - 2024 Feb 1

Bibliographical note

Publisher Copyright:
© 2023 Elsevier B.V.

Keywords

  • Eco-friendl
  • Multilayer device
  • Multi‐resonance thermally activated delayed fluorescence
  • Organic light-emitting diode
  • Solution-process

ASJC Scopus subject areas

  • General Chemistry
  • Environmental Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering

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