Paper Title:
Optical Properties of 3,4,9,10-Perylenetetracarboxylic Dianhydride and 8-Hydroxyquinoline Aluminum Salt Films Prepared by Vacuum Deposition
  Abstract

The main purpose of this paper is to investigate the optical properties of PTCDA and Alq3 films, prepared by two steps, vacuum evaporation and deposition processes on platelets of glass, quartz, and indium-tin-oxide (ITO) coated glass. We have emphasised the bands structure of the absorption spectra with peaks situated at 358 nm, 374 nm, 475 nm and 552 nm in PTCDA, respectively 232 nm, 261 nm and 380 nm in Alq3 that confirms the dominant presence of Alq3 meridianal molecular isomer. For PTCDA films deposited on glass coated with ITO, the structure of the weak double peak at low wavelength is partially modified, but the positions of the two important absorption peaks situated at 2.25 eV and 2.61 eV are unchanged. The two different luminescence emission peaks obtained in Alq3 for different excitation wavelengths (λ=360 nm and λ=520 nm) suggest the existence of the facial isomer beside the meridianal one. We have evidenced a significant Stocks shift in the spectra (EPTCDA=0.40 eV; EAlq3=0.9 eV) and a large Frank- Condon shift (0.40-2.3 eV), suggesting important effect associated respectively with the solid state structure and important conformational differences between the ground and excited state.

  Info
Periodical
Materials Science Forum (Volumes 514 - 516)
Edited by
Paula Maria Vilarinho
Pages
956-960
DOI
10.4028/www.scientific.net/MSF.514-516.956
Citation
Anca Stanculescu et al., 2006, Materials Science Forum, 514-516, 956
Online since
May 2006
Price
US$ 28,-
Share
Authors: Onanong Chamlek, S. Pratontep, T. Kerdcharoen, Tanakorn Osotchan
Abstract:Iron phthalocyanine (FePc) thin films prepared by thermally evaporated from as received and purified powders were studied. The molecular...
301
Authors: Yuan Ming Huang, Bao Gai Zhai, Qing Lan Ma
Abstract:We have investigated the optical absorption and photoluminescence (PL) of a classical banana-shaped liquid crystal,...
146
Authors: Gaurang Patel, M.B. Sureshkumar, Purvi Patel
Chapter 11: Materials Behavior
Abstract:The transmittance, absorbance, and reflectance of PMMA/TiO2 composites, in different weight percentage of TiO2, prepared by a solution cast...
3249
Authors: Hai Lang Ju, Zong Liang Mao
Chapter 2: Optical Materials and Devices
Abstract:LiNbO3 is an important crystal which has piezoelectric, ferroelectric and electro-optical functions. It has a wide range of applications....
87
Authors: Feng Miao, Ying Huang
Chapter 09: Materials Science
Abstract:Considering the crystal field parameter B, C and average covalent factor N, the energy levels of Li2GeO3: Cr3+ crystal are calculated by...
906