ZnS:Cu colloid optical properties

which vary with Cu

+

doping concentration and aging process

were studied in thiourea and thiosulfurate systems.Exited at 325nm

ZnS:Cu colloid gives off a green band emission from 500 to 540nm

and the highest intensity appears in samples with doping concentration about 0.6%.The green emission band presents obvious red-shift as the Cu

+

doping concentration increases

and it is also red-shift with the increasing reaction time.For the samples doped with 0.2% Cu

+

a blue emission band at 450nm can also be observed besides the green one

and it will be quenched at higher doping concentration.The optical properties of thiourea and thiosulfurate system are quit similar

but the intensity of the latter is higher than that of the former.