Investigating the effect of dielectric constant and ion mobility in light emitting electrochemical cells

ORAL

Abstract

Light emitting electrochemical cells (LEECs) are promising low-cost technologies for display and solid state lighting. A certain type of these devices can be made from a combination of complex emitters made from transition metal complexes and counterions. We investigated the effect of different negative counterions paired with iridium emitters on the performance of the devices. By performing impedance spectroscopy, we were able to estimate the mobility of the ions and the dielectric constant of the film. We complemented the experimental results with simulation studies using a drift-diffusion model where the recombination of electrons and holes is facilitated by a Langevin process. Ultimately, using different counterions yields slightly different values of dielectric constants and ion mobilities that affect their performance.

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Authors

  • Lyndon Bastatas

    The University of Texas at Dallas, Physics Department, Oklahoma State University, Oklahoma State University

  • Qiye Zheng

    Santa Fe Institute, Baylor University, University of Texas at Dallas, Department of Chemistry, The University of Texas at Austin, Jozef Stefan Institute, Texas A&M University-Commerce, Commerce, Texas 75429, Cyclotron Institute, Texas A&M University, College Station, Texas 77843, Texas A&M University, Department of Physics, Texas State University, Department of Physics, Baylor University, University of Texas at El Paso, Univ of Texas, El Paso, University of Science and Technology of China, The University of Texas at Dallas, Faculty, None, Southwestern University, Texas State University, Texas A&M University - Commerce, UT Southwestern Medical Center, National High Magnetic Field Laboratory, The Cyclotron Institute at Texas A&M University, Department of Biological Sciences, Texas State Univ-San Marcos, The University of Texas at Dallas, Richardson, Texas 75080, King Abdullah University of Science and Technology, Univ of Texas, Dallas, N.Chiao Tung U., UT Dallas, Inorganic Chemistry and Catalysis Group, Utrecht University, Electrical & Computer Engineering, Baylor University, Department of Materials Science and NanoEngineering, Rice University, University of Texas at Arlington, University of Chicago, The University of Mississippi, Astronomical Observatory, Warsaw University, Nicolaus Copernicus Astronomical Centre, Polish Academy of Sciences, Rochester Institute of Technology, California Institute of Technology, University of Houston, NASA-GSFC and UMBC, MD, Virginia Tech, VA, Texas Christian University, The University of Texas at San Antonio, Department of Physics, Teivecca Nazarene University, Weatherford College, Air Force Research Laboratory, Sensors Directorate, WPAFB, OH, USA, Air Force Research Laboratory, Directed Energy Directorate, KAFB, NM, US, Department of Physics & Astronomy, University of Texas at San Antonio TX, USA, University of Arizona, University of North Carolina at Chapel Hill, Stanford University, Harvard Center for Astrophysics, Texas A\&M University, UTSW, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, Boston College, Chestnut Hill, Massachusetts 02467, Naval Research Laboratory, Washington, D.C. 20375

  • Jason Slinker

    University of Texas at Dallas, The University of Texas at Dallas, Physics Department, University of Texas - Dallas, Univ of Texas - Dallas, Department of Physics, University of Texas, Dallas