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Title: Exciton quenching at PEDOT:PSS anode in polymer blue-light-emitting diodes

The quenching of excitons at the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid) (PEDOT:PSS) anode in blue polyalkoxyspirobifluorene-arylamine polymer light-emitting diodes is investigated. Due to the combination of a higher electron mobility and the presence of electron traps, the recombination zone shifts from the cathode to the anode with increasing voltage. The exciton quenching at the anode at higher voltages leads to an efficiency roll-off. The voltage dependence of the luminous efficiency is reproduced by a drift-diffusion model under the condition that quenching of excitons at the PEDOT:PSS anode and metallic cathode is of equal strength. Experimentally, the efficiency roll-off at high voltages due to anode quenching is eliminated by the use of an electron-blocking layer between the anode and the light-emitting polymer.
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Molecular Electronics, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen (Netherlands)
  2. (Netherlands)
  3. TNO/Holst Centre, High Tech Campus 31, 5605 KN, Eindhoven (Netherlands)
  4. Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz (Germany)
  5. (Saudi Arabia)
Publication Date:
OSTI Identifier:
22402788
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANODES; CATHODES; DEPLETION LAYER; DIFFUSION; EFFICIENCY; ELECTRIC POTENTIAL; ELECTRON MOBILITY; ELECTRONS; EXCITONS; LIGHT EMITTING DIODES; POLYMERS; QUENCHING; RECOMBINATION; TRAPS