Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 49: Poster – Photonics, Lasers, and Applications
Q 49.8: Poster
Wednesday, March 12, 2025, 17:00–19:00, Tent
The photoluminescence of transparent glass-ceramics based on ZnO nanocrystals Co-doped with Lanthanide elements Eu3+, Yb3+ ions. — •Moursi Abu Bieh1 and Grigory Arzumanyan2 — 1Photo Chemistry Department, Egyptian National Research Center, El-Behoos Street, Giza, Cairo, Egypt — 2Dubna, Russia
Transparent glasses of the K2O.ZnO.Al2O3.SiO2 Chemical Formula which is Co-doped with Eu2O3 and Yb2O3 were prepared by the melt-quenching technique. transparent zincite ZnO glass ceramics were obtained by secondary heat treatment methods at 860∘C.At 860∘C, traces of Eu Oxyapatite will appear in addition to ZnO nanocrystals. The average crystal size obtained from the X-ray diffraction data was found to range between 14 and 35 nm. The absorption spectra of the initial glasses are composed of an absorption edge and absorption bands due to the electronic transitions of Eu ions. With heat-treatment, the absorption edge pronouncedly shifts to the visible spectral range. The luminescence properties of glass and glass-ceramics were studied by measuring their excitation and emission spectra at 300, 78, and 4.2 K. Changes in the luminescence properties of the Eu-related excitation and emission bands were observed after heat-treatments at 680∘C and 860∘C. ZnO nanocrystals showed both broad luminescence (400-850 nm) and free-exciton emission near 3.3 eV at room temperature. upconversion luminescence spectrum of initial glass was obtained under excitation of the 976 nm laser source.
Keywords: Glass Ceramics; nanocrystals; Fluorescence Up-Conversion; Co-doping of Lanthanide element; Lifetime measurements