Khan, Atif F. and Yadav, Ravishanker and Mukhopadhya, P. K. and Singh, Sukhvir and Dwivedi, Charu and Dutta, Viresh and Chawla, Santa (2011) Core–shell nanophosphor with enhanced NIR–visible upconversion as spectrum modifier for enhancement of solar cell efficiency. Journal of Nanoparticle Research , 13 (12). 6837-6846. ISSN 1388-0764