The Ph.D., Research is towards to develop the metal based Carbon quantum dots (CQDs) by bottom up approach using green source as the raw materials. CQDs and metal based CQDs were developed for various optical and non optical applications. The keystone of this work was to find and develop a non-toxic, green-based, fluorescent materials for optical applications. During this journey, research and review articles were published in international peer review journals indexed in the Directory of Open Access Journals (DOAJ), Scopus and Web of Science: Emerging Sources Citation Index.