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Journal of Materials
Volume 2013 (2013), Article ID 690237, 5 pages
http://dx.doi.org/10.1155/2013/690237
Research Article

Investigations of Different Phases Responsible for Changes in Optical Properties of Organic Semiconducting Device Material Thin Films

1Department of Applied Physics, School of Vocational Studies and Applied Sciences, Gautam Buddha University, Greater Noida, Gautam Budh Nagar 201312, India
2Department of Applied Chemistry, School of Vocational Studies and Applied Sciences, Gautam Buddha University, Greater Noida, Gautam Budh Nagar 201312, India

Received 22 November 2012; Revised 6 February 2013; Accepted 12 February 2013

Academic Editor: Sung-Hoon Kim

Copyright © 2013 Vivek Kumar Shukla and Jaya Maitra. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The environment sensitivity of organic semiconductors may change their molecular structure and hence optical properties. Exploiting this concept, experiments were performed on a green light emitting material bis(8-hydroxy quinoline)Zinc, (Znq2) used in organic light emitting diodes (OLEDs). Thin films were deposited at varying deposition parameters, and their properties were compared. We investigated that as deposited films have a significant component of Znq2 tetramer out of two known forms, that is, dihydrate and anhydrous tetramer (Znq2)4, the films deposited at lower deposition rates have higher anhydrous content. The degradation of thin film is shown, that changes the optical properties of film from green emission to blue which may be due to water adsorption and crystallization.