The Physics Society of Iran Iranian Journal of Physics Research 1682-6957 21 3 2021 11 22 Fabrication of a dye-based random laser using ZnS:Mn quantum dots and investigating the effects of their concentration Fabrication of a dye-based random laser using ZnS:Mn quantum dots and investigating the effects of their concentration 117 125 1712 10.47176/ijpr.21.3.81110 FA A Ghasempour Ardakani Department of Physics, College of Science, Shiraz University, Shiraz, Iran P Rafieipour Department of Physics, College of Science, Shiraz University, Shiraz, Iran M J Samimipour Department of Physics, College of Science, Shiraz University, Shiraz, Iran J Tashkhourian Department of Physics, College of Science, Shiraz University, Shiraz, Iran Journal Article 2020 08 19 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.<br />  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.<br />  https://ijpr.iut.ac.ir/article_1712_a51c896c9cb81ecb5a199d51ac9fc3c5.pdf