%0 Journal Article %T Fabrication of a dye-based random laser using ZnS:Mn quantum dots and investigating the effects of their concentration %J Iranian Journal of Physics Research %I Isfahan University of Technology, The Physics Society of Iran %Z 1682-6957 %A Ghasempour Ardakani, A %A Rafieipour, P %A Samimipour, M J %A Tashkhourian, J %D 2021 %\ 11/22/2021 %V 21 %N 3 %P 117-125 %! Fabrication of a dye-based random laser using ZnS:Mn quantum dots and investigating the effects of their concentration %K Mn doped ZnS quantum dots %K multiple light scattering %K random lasers %R 10.47176/ijpr.21.3.81110 %X 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.  %U https://ijpr.iut.ac.ir/article_1712_c7ede9b3c67352491cd520238d147eeb.pdf