1. Department of Electronics and Communication EngineeringTechno College of Engineering Agartala Agartala 799004 Tripura India
2. Department of PhysicsNational Institute of Technology Agartala Agartala 799046 Tripura India
3. Department of PhysicsKazi Nazrul University Asansol 713340 West Bengal India
4. Centre for Organic Spintronics and Optoelectronics DevicesKazi Nazrul University Asansol 713340 West Bengal India