1. Department of Physics, King's College London, Strand, London, WC2R 2LS (UK), Fax: (+44) (0)20 7848 2420
2. Department of Chemistry, Imperial College London, Exhibition Road, London, SW7 2AZ (UK)
3. PhotoBiotics Ltd. 21 Wilson Street, London, EC2M 2TD (UK).
4. Institute of Optoelectronics, Shenzhen University, 3688 Nanhai Road, Shenzhen, Guangdong Province 518060 (PR China)