1. PREPARATION AND CHARACTERIZATION OF MANGANESE DOPED ZINC SULPHIDE NANOCRYSTALLINE POWDERS WITH LUMINESCENT PROPERTIES. Authors: ADRIAN-IONUŢ CADIŞ, ADRIAN RAUL TOMŞA, ECATERINA BICA, LUCIAN BARBU TUDORAN, LUMINIŢA SILAGHI-DUMITRESCU, ELISABETH-JEANNE POPOVICI.