synthesis and characterization of transition metal doped znse/zns nanocrystals by a rapid photochemical method

In the present work, a one pot, rapid and room temperature photochemical synthesis of transition metal (tm; cu, mn, cr)-doped znse/zns core/shell nanocrystals (ncs) was reported. ft-ir spectrum confirmed the capping of znse by thioglycolic acid. xrd and tem analysis demonstrated zinc blende phase ncs with an average size of around 3 and 5 nm for tm:znse and tm:znse/zns ncs, respectively. pl spectra of znse ncs showed a broad emission with two peaks located at 380 and 490 nm related to exitonic and trap states emission, respectively. for znse:cu ncs, exitonic emission disappeared completely and pl intensity of trap states emission increased. for znse:mn and znse:cr ncs, the exitonic emission decreased gradually with the increase in the impurity concentration whereas trap state emission increased. moreover a peak about 580 nm was appeared from 4t1-6a1 transition of the mn impurity. zns shell increased photoluminescence and stability of all of tm-doped znse ncs.