1. a LC Works, 6/68 Brinsley Road, Camberwell, VIC 3124, Australia Department of Advanced Materials Science and Engineering, Faculty of Engineering, Yamaguchi University, Tokiwadai 2557, Ube, Yamaguchi 755-8611, Japan
2. b Department of Advanced Materials Science and Engineering, Faculty of Engineering, Yamaguchi University, Tokiwadai 2557, Ube, Yamaguchi 755-8611, Japan
3. c Department of Organic Materials, Osaka National Research Institute, 1-8-31 Midorigaoka 1-chome, Ikeda, Osaka 563, Japan