Enhanced Luminance of Electrochemical Cells with a Rationally Designed Ionic Iridium Complex and an Ionic Additive

Kristin J. Suhr, Lyndon D. Bastatas, Yulong Shen, Lauren A. Mitchell, Bradley J. Holliday, Jason D. Slinker

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

Light-emitting electrochemical cells (LEECs) offer the potential for high efficiency operation from an inexpensive device. However, long turn-on times and low luminance under steady-state operation are longstanding LEEC issues. Here, we present a single-layer LEEC with a custom-designed iridium(III) complex and a lithium salt additive for enhanced device performance. These devices display reduced response times, modest lifetimes, and peak luminances as high as 5500 cd/m2, 80% higher than a comparable device from an unoptimized complex and 50% higher than the salt-free device. Improved device efficiency suggests that salt addition balances space charge effects at the interfaces. Extrapolation suggests favorable half-lives of 120 ± 10 h at 1000 cd/m2 and 3800 ± 400 h at 100 cd/m2. Overall, complex design and device engineering produce competitive LEECs from simple, single-layer architectures.

Original languageEnglish (US)
Pages (from-to)8888-8892
Number of pages5
JournalACS Applied Materials and Interfaces
Volume8
Issue number14
DOIs
StatePublished - Apr 27 2016

Bibliographical note

Funding Information:
J.D.S. acknowledges support from UT Dallas startup funds. B.J.H. gratefully acknowledges the Welch Foundation (F-1631) and the National Science Foundation (CHE-0847763) for financial support of this research.

Keywords

  • ionic additives
  • ionic iridium complex
  • ionic transition metal complex
  • light-emitting electrochemical cells
  • luminance
  • organic light-emitting diodes

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