Dr. Sajjad Ullah is a regular full-time faculty member of the Institute of Chemical Sciences, University of Peshawar. He received his PhD degree from the Institute of Chemistry of São Carlos (IQSC), University of São Paulo (USP) Brazil in 2014 and his Master degree (M.Sc) in analytical chemistry from University of Peshawar-Pakistan in 2006. He worked as a postodoctral researcher (2016-18) at State University of São Paulo (IQ-UNESP), Brazil.  His research focusses on the development of visible light active nanometric semiconductor photocatalysts, Rare-earth metalas-based upconversion, ORMOSIL-polyoxometalates hybrid photoactive materials, thin photoactive/self-cleaning films preparation, core@shell nanoparticles, organic-inorganic hybrid materials, sol-gel chemistry, water purification, photochromism and photocatalysis