Affiliation: | (1) Institute of Material Sciences, National Centre for Sciences and Technology of Vietnam. Nghia Do, Tu Liem, Hanoi, Vietnam (Fax: 84 4 8352483; E-mail: daihung@lls-ims.ac.vn), VN;(2) Photodynamic Research Center, Institute of Physical and Chemical Research (RIKEN) 19-1399 Nagamachi Koeji, Aoba, Sendai 980, Japan, JP |