1. Department
of Materials and Optoelectronic Science, Center for Functional Polymers
and Supramolecular Materials, National Sun Yat-Sen University, Kaohsiung 804, Taiwan
2. Department
of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1-S8-36
O-okayama, Meguro-ku, Tokyo 152-8552, Japan