1. Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, Brno CZ-613 00, Czech Republic
2. Central European Institute of Technology, Brno University of Technology, Technicka 3058/10, Brno CZ-616 00, Czech Republic
3. Department of Graphic Arts and Photophysics, University of Pardubice, Doubravice 41, Pardubice, CZ-533 53, Czech Republic