“…Processes in which transitions with the photo-generated holes at the surface of the NPs are trapped by O2-ions are probably responsible for the visible emission of those NPs. Doping with Mn could increase these surface defects of NPs and improve the action of PDT.. X-Ray Diffraction (XRD) patterns of ZnO:Mn+2 NPs showed several peaks with 2Ɵ of 31.67°, 34.31°, 36.14°, 47.40°, 56.52°, 62.73°, 66.28°, 67.91° and 69.03° corresponding to (100), (002), (101), (102), (110), (103), (200), (112) and (201) planes), indicating an hexagonal wurtzite structure 23,52 . No additional peaks related to any other impurities were detected.…”