Trap States of Tris-8-(Hydroxyquinoline)Aluminum Degraded by Blue Laser Using Thermally Stimulated Current Method

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Published 1 September 2003 • Copyright (c) 2003 The Japan Society of Applied Physics
, , Citation Yuichi Hashimoto et al 2003 Jpn. J. Appl. Phys. 42 5672 DOI 10.1143/JJAP.42.5672

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Author affiliations

1 Advanced Materials Research Center, Canon Inc., 3-30-2 Shimomaruko, Ota-ku, Tokyo 146-8501, Japan

2 Department of Electrical Engineering, Faculty of Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan

3 The Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

4 Department of Electric, Electronic, and Communication Engineering, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan

Dates

  1. Received 11 March 2003
  2. Accepted 2 May 2003
  3. Published

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Abstract

We investigated the photodegradation phenomena of tris-8-(hydroxyquinoline)aluminum (Alq3) film after irradiation with a blue laser of 442 nm to identify the contributions of the excited states of Alq3 molecules. The photodegraded Alq3 film showed decreases in fluorescence lifetime and carrier transport ability markedly. These photodegradation phenomena are considered to be due to an increase in the energy distribution of trap states detected from the analysis by a thermally stimulated current (TSC) method, in connection with the orientation of neighboring Alq3 molecules, e.g., the disordered aggregation states of Alq3 molecules.

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10.1143/JJAP.42.5672