Improving device efficiencies of solid-state white light-emitting electrochemical cells by adjusting the emissive-layer thickness

Yuan Pei Jhang, Hsiao Fan Chen, Hung Bao Wu, Yun Shiuan Yeh, Hai-Ching Su*, Ken Tsung Wong

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

Exciton quenching in the recombination zone close to electrochemically doped regions would be one of the bottlenecks for improving device efficiencies of solid-state white light-emitting electrochemical cells (LECs). To further enhance device efficiencies of white LECs for practical applications, we adjust the emissive-layer thickness to reduce exciton quenching. In white LECs with properly thickened emissive-layer thickness, the recombination zone can be situated near the center of the emissive layer, rendering mitigated exciton quenching and thus enhanced device efficiencies. High external quantum efficiencies and power efficiencies of optimized devices reach ca. 11% and 20 lm/W, respectively, which are among the highest reported for white LECs. These results confirm that tailoring the thickness of the emissive layer to avoid exciton quenching would be a feasible approach to improve device efficiencies of white LECs.

Original languageEnglish
Pages (from-to)2424-2430
Number of pages7
JournalOrganic Electronics
Volume14
Issue number10
DOIs
StatePublished - 1 Jan 2013

Keywords

  • Light-emitting electrochemical cells
  • Recombination zone
  • White light

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