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Title: Synthesis, characterization and properties of yellow-light-emitting polyethers containing bis(styryl)anthracene units

Aromatic aliphatic polyethers containing bis(styryl)anthracene units in the main chain separated by flexible spacer of 11 (AND52) or 12 (AND53) methylene units, were synthesized and characterized aiming to be applied as emitting materials in polymer light emitting diode (PLED) devices. The polymers are soluble in common organic solvents and have average molecular weight of about 15kDa. Differentiations owing to an odd-even number of methylene units (χ=11 vs χ=12) are observed in their optical properties in solid state. Thin films as well as PLED devices were fabricated via conventional spin-coating process. Initially, various parameters have been investigated concerning the solubility of the polymers, the effect of film thickness on the electrical properties, and their thermal stability. The optical properties of the two polymers were investigated by NIR-Vis-far UV spectroscopic ellipsometry (SE). The accurate determination of the thickness and the optical constants (refractive index and dielectric function as a function of wavelength) were derived. These provide substantial insights into the final design of the optimum final multi-layer structure of the PLEDs, if we take into account that the external quantum efficiency (EQE) of electroluminescence (EL) strongly depends on the optical interference of the beams of emitted light that have been multiply reflectedmore » from the layer interfaces. The morphological characterization of the AND52 and AND53 polymeric thin films was carried out using atomic force microscopy (AFM), while current density-voltage (J-V) characteristics of the devices were studied by electrical measurements. The single PLED devices were switched on at relatively low operation voltages, showing the potential as backplanes for active matrix PLED applications. In this perspective, it can be assumed that further studies of the presented materials will enable the development of flexible PLEDs with the possibility to scale up their dimensions for bigger active area devices.« less
Authors:
; ; ;  [1] ; ;  [2] ;  [3]
  1. Laboratory for Thin Films-Nanosystems and Nanometrology (LTFN), Physics Department, Aristotle University of Thessaloniki, GR-54124 Thessaloniki (Greece)
  2. Department of Chemistry, University of Patras, University Campus, Rio-Patras GR26504, Greece and Foundation for Research and Technology Hellas, Institute of Chemical Engineering Sciences (FORTH/ICE-HT), Platani Str., Patras GR26504 (Greece)
  3. Department of Chemistry, University of Patras, University Campus, Rio-Patras GR26504 (Greece)
Publication Date:
OSTI Identifier:
22391019
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1646; Journal Issue: 1; Conference: NANOTEXNOLOGY 2014: International Conferences and Exhibition on Nanotechnologies and Organic Electronics, Thessaloniki (Greece), 5-12 Jul 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANTHRACENE; ATOMIC FORCE MICROSCOPY; CURRENT DENSITY; DIELECTRIC MATERIALS; ELECTRICAL PROPERTIES; ELECTROLUMINESCENCE; ELLIPSOMETRY; LAYERS; LIGHT EMITTING DIODES; ORGANIC SOLVENTS; POLYETHYLENE GLYCOLS; QUANTUM EFFICIENCY; REFRACTIVE INDEX; SOLIDS; SPIN-ON COATING; THIN FILMS; VISIBLE RADIATION