1. Organic and Materials Chemistry Laboratory Department of ChemistryNational Institute of Technology Karnataka Srinivasnagar 575025 Mangaluru India
2. Laser and Nonlinear Optics Laboratory Department of PhysicsNational Institute of Technology Calicut Kozhikode 673601 Kerala India
3. Photosciences and Photonics Section Chemical Sciences and Technology DivisionCSIR-National Institute for Interdisciplinary Science and Technology Thiruvananthapuram Kerala 695019 India