1. Center of Excellence for Advanced Materials Research King Abdulaziz University P.O. Box 80203 Jeddah 21589 Saudi Arabia
2. Department of Chemistry King Abdulaziz University P.O. Box 80203 Jeddah 21589 Saudi Arabia
3. Laboratory of Photonics and Interfaces Ecole Polytechnique Federale de Lausanne 1015 Lausanne Switzerland