1. Functional Organic Materials and Devices; Department of Chemical Engineering and Chemistry; Eindhoven University of Technology; Den Dolech 2 5600 MB Eindhoven The Netherlands
2. Chemical Physics Interdisciplinary Program; Liquid Crystal Institute; Kent State University; Kent OH 44242 USA
3. Instituto de Ciencia de Materiales de Aragón; Departamento de Física de la Materia Condensada; CSIC-Universidad de Zaragoza; Zaragoza Spain