Berlin 2018 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 27: Postersession KFM
KFM 27.32: Poster
Donnerstag, 15. März 2018, 15:00–17:00, Poster E
The Influence of Rare Earth Doping and Co-doping of ZnO Nanoparticles on Structural and Optical Properties — •Maria Toma1,2, Oleksandr Selyshchev3, Aurel V. Pop1, and Dietrich R.T. Zahn3 — 1Babes-Bolyai University, Physics Faculty, M. Kogalniceanu No. 1, 400084, Cluj-Napoca, Romania — 2Research Center for Advanced Medicine Iuliu Hatieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania — 3Chemnitz University of Technology, Semiconductor Physics, D-09107 Chemnitz, Germany
Gd-doped, Er-doped, and (Gd+Er) co-doped ZnO nanocrystals were prepared by a soft colloidal synthesis method [1]. Due to their applications in optoelectronic, display, and memory devices [2,3], semiconductor nanocrystals doped with rare earths (RE) are of great interest. Microstructural properties of the nanocrystals obtained were characterized using Raman spectroscopy and their distribution and crystallinity were identified using transmission electron microscopy. From TEM measurements we evaluated the size of the nanoparticles to be in the range of 4 to 7 nm. Optical properties were investigated using photoluminescence (PL) and UV-vis spectroscopy to understand the excited state energy distribution between band to band transitions and the defect states. Depending on the size distribution of the nanoparticles, changes in the PL and UV absorbance of ZnO were observed, due to the incorporation of RE ions into the ZnO nanostructure Owing to the electronic configuration of the RE ions, the 4f shell transitions show sharp and narrow band emission. This effect is consistent with Raman and other literature results.