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HL: Fachverband Halbleiterphysik
HL 29: Poster II
HL 29.60: Poster
Dienstag, 18. März 2025, 18:00–20:00, P1
enhancing the emission Intensity of Mn2+ by doping with Ln3+ ions in ZnSe QDs and heavy metal ions detection — •Iram Gul1, Zahid U. Khan2, Latif U. Khan3, Hermi F. Brito4, and Muhammad Abdullah Khan5 — 1Department of Environmental Sciences, Quaid-i-Azam University (QAU), 15320, Islamabad, Pakistan — 2Research Centre for Greenhouse Gas Innovation, University of Sao Paulo (USP), 05508-030, São Paulo * SP, Brazil — 3Synchrotron-light for Experimental Science and Applications in the Middle East (SESAME) P.O. Box 7, Allan 19252, Jordan — 4Institute of Chemistry, University of São Paulo (USP), 05508-000, São Paulo-SP, Brazil — 5Department of Environmental Sciences, Quaid-i-Azam University (QAU), 15320, Islamabad, Pakistan
This study enhances the photoluminescence of ZnSe:Mn2+ quantum dots (QDs) by doping with Ln3+ ions (Sm3+, Gd3+, La3+, Y3+, Nd3+, Yb3+, Tm3+, Lu3+). Sm3+ and Gd** exhibited the strongest emissions due to efficient energy transfer to Mn2+, while other ions showed quenching at higher concentrations. These QDs, with uniform morphology, were applied to detect heavy metals (Pb2+, Cr3+, Hg2+, Cu2+, Fe2+), which quenched photoluminescence. Pb2+ showed the highest sensitivity (LoD: 4.648.10-3 mol/L), and Fe2+ the lowest (LoD: 5.257.10 -3 mol/L). ZnSe:Ln3+,Mn2+ QDs demonstrate potential for advanced photoluminescent applications and environmental monitoring of pollutants
Keywords: Quantum dots; Enhanced emission intensity; Metal ions detection; Lanthanide ions doping; Zinc Salenide QDs