1. Photosciences and Photonics Section, Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram 695019 Kerala, India
2. Research Centre, University of Kerala, Thiruvananthapuram 695034, Kerala, India
3. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India