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Synthesis, photophysical and photoelectrical properties of glass-forming phenothiazinyl- and carbazolyl-substituted ethylenes

J. SIMOKAITIENE1, S. GRIGALEVICIUS1, J. V. GRAZULEVICIUS1,* , R. RUTKAITE2, K. KAZLAUSKAS3, S. JURSENAS3,4, V. JANKAUSKAS5, J. SIDARAVICIUS6

Affiliation

  1. Department of Organic Technology, Kaunas University of Technology, Radvilenu plentas 19, LT-50254, Kaunas, Lithuania
  2. Department of Chemistry, University of Sheffield, Sheffield, S Yorkshire S3 7HF England
  3. Institute of Materials Science and Applied Research, Vilnius University, Sauletekio aleja 9, LT-10222, Vilnius, Lithuania
  4. Institute of Physics, Savanori 231, LT-02300 Vilnius, Lithuania
  5. Department of Solid State Electronics, Vilnius University, Sauletekio aleja 9, LT-10222, Vilnius, Lithuania
  6. Department of Polygraphic Machines, Vilnius Gediminas Technical University, J. Basanaviciaus 28, LT-10223, Vilnius, Lithuania

Abstract

Phenothiazinyl- and carbazolyl-substituted ethylenes have been synthesized and found to constitute electro-active materials with high thermal stability as characterised by thermo-gravimetric analysis. Steady state absorption and luminescence spectra of the synthesized derivatives were examined in detail revealing green-blue emission with efficiency ranging from 13 % to 28 %. Based on the emission spectra of the synthesized compounds Commission Internationale d'Eclairage (CIE) chromaticity coordinates have been obtained. Major luminescence decay time component of ~2.5 ns was determined in dilute solutions of the compounds, whereas significantly shorter one has been estimated in thin films. Electron photoemission spectra of the materials have been recorded and the ionisation potentials of 5.3-5.4 eV have been established. Room temperature hole drift mobilities of the diarylethylenes dispersed in polymeric host approached 10-5 cm2/Vs at high electric fields..

Keywords

Aromatic amine, Diarylethylene, Amorphous material, Luminescence, Hole drift mobility, Ionisation potential.

Submitted at: Sept. 22, 2005
Accepted at: March 23, 2006

Citation

J. SIMOKAITIENE, S. GRIGALEVICIUS, J. V. GRAZULEVICIUS, R. RUTKAITE, K. KAZLAUSKAS, S. JURSENAS, V. JANKAUSKAS, J. SIDARAVICIUS, Synthesis, photophysical and photoelectrical properties of glass-forming phenothiazinyl- and carbazolyl-substituted ethylenes, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 2, pp. 876-882 (2006)