eng Science and Education Publishing Nanoscience and Nanotechnology Research 2372-4676 2017-08-18 4 4 120 126 10.12691/nnr-4-4-1 NNR2017441 article Ekta Singh 1 Richa Srivastava richadolly@rediffmail.com 2 Utkarsh Kumar 3 Anamika. D. Katheria 3 M.Tech Nano-optoelectronics, Babasaheb Bhimrao Ambedkar University, Lucknow, India University Institute of Engineering and Technology, Babasaheb Bhimrao Ambedkar University, Lucknow, India Department of Applied Physics, Babasaheb Bhimrao Ambedkar University, Lucknow, India Present review articles deals with the detail introduction, classification, fabrication techniques and optical application of carbon nanotubes. Presently various techniques are used to manufacture MWNTs or SWNTs. The optical properties of CNTs are closely linked to their structure and optical absorption of CNTs is of saturable intensity dependent nature. The various optical properties and detail application as light emitting diode are discussed. http://pubs.sciepub.com/nnr/4/4/1/nnr-4-4-1.pdf CNTs mobility CVD LED