عنوان مقاله :
Fabrication of a dye-based random laser using ZnS:Mn quantum dots and investigating the effects of their concentration
پديد آورندگان :
P ،Rafieipour Department of Physics - College of Science - Shiraz University - Shiraz, Iran , A ،Ghasempour Ardakani Department of Physics - College of Science - Shiraz University - Shiraz, Iran , M ،Jaafar Samimipour Department of Physics - College of Science - Shiraz University - Shiraz, Iran , J ،Tashkhourian Department of Physics - College of Science - Shiraz University - Shiraz, Iran
كليدواژه :
Mn doped ZnS quantum dots , multiple light scattering , random lasers
چكيده فارسي :
Zinc chalcogenide quantum dots (QDs) doped with paramagnetic transition metal ions (particularly ZnS:Mn QDs) are new attractive
but rarely examined semiconductor nanocrystals that have excellent optical properties and enhanced thermal and environmental
stability compared to Cd-based QDs. In this paper, we demonstrate a dye-based random laser (RL) with nonresonant feedback using
ZnS:Mn QDs as the scattering medium that are dispersed in a Rhodamine B (RhB) dye solution. The nonlinear variation of the
emission spectrum as a function of the excitation energy implies a random lasing threshold. Moreover, we observe a blue-shift of the
emission wavelength by 10.3 nm and a 5.3 times decrease in the RL threshold by increasing the scatterer concentration. We also
provide a theoretical discussion based on the diffusion theory for explaining the observed experimental results.
عنوان نشريه :
پژوهش فيزيك ايران
