White emission from exciplex-based polymer light-emitting electrochemical cells

Yoshinori Nishikitani, Suzushi Nishimura, Soichi Uchida

Research output: Chapter in Book/Report/Conference proceedingChapter

3 Citations (Scopus)

Abstract

Light-emitting electrochemical cells (LECs) are seen as a promising technology that could usher in a new generation of lighting devices that are both energy- and cost-efficient. This has created an urgent need for highly efficient white-emitting LECs. Technologies have to be developed for realizing efficient white emission, suited to the simple structure of LEC devices. Utilizing exciplex emission is one means of obtaining white emission. In this chapter, the authors present an approach to obtaining white emission based on emission from exciplexes formed between a fluorescent conducting polymer (FCP) and aromatic amines. The exciplexes, which are complexes that can form between molecules in the excited state, emit light as electrons are transferred from the lowest unoccupied molecular orbital (LUMO) of the FCP to the highest occupied molecular orbital (HOMO) of the amine. The exciplex emission includes longer wavelengths and is broader in spectrum than the excitonic emission of FCP, such that white light can be obtained by combining the two types of emissions. By using the right amine in the proper concentration, we were able to produce white emission with x/y CIE color coordinates of 0.33/0.31 and a color rendering index (CRI) of 80 with a device having only a single active layer.

Original languageEnglish
Title of host publicationLight-Emitting Electrochemical Cells
Subtitle of host publicationConcepts, Advances and Challenges
PublisherSpringer International Publishing
Pages267-286
Number of pages20
ISBN (Electronic)9783319586137
ISBN (Print)9783319586120
DOIs
Publication statusPublished - 2017 Jul 31

Keywords

  • Exciplex
  • Exciton
  • Fluorescent π-conjugated polymer
  • Ionic polyelectrolyte
  • White polymer-based light-emitting electrochemical cell

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)
  • Chemistry(all)

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  • Cite this

    Nishikitani, Y., Nishimura, S., & Uchida, S. (2017). White emission from exciplex-based polymer light-emitting electrochemical cells. In Light-Emitting Electrochemical Cells: Concepts, Advances and Challenges (pp. 267-286). Springer International Publishing. https://doi.org/10.1007/978-3-319-58613-7_10