Tunable visible emission of TM-doped ZnS quantum dots (TM: Mn2+, Co2+, Ag+) S.M. Taheri Otaqsara Eur. Phys. J. Appl. Phys., 59 1 (2012) 10404 Published online: 03 August 2012 DOI: 10.1051/epjap/2012120148