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Your search keyword '"Pisarski, Wojciech"' showing total 16 results
Start Over Author "Pisarski, Wojciech" Journal optical materials
16 results on '"Pisarski, Wojciech"'

16. Structural and optical aspects for Eu3+ and Dy3+ ions in heavy metal glasses based on PbO–Ga2O3–XO2 (X=Te, Ge, Si)

Author

Pisarski, Wojciech A., Pisarska, Joanna, Żur, Lidia, and Goryczka, Tomasz

Subjects
*EUROPIUM compounds, *OPTICAL properties, *HEAVY metals, *LEAD compounds, *X-ray diffraction, *FOURIER transform infrared spectroscopy, *LUMINESCENCE
Abstract

Abstract: Structural and optical properties of Eu3+ and Dy3+ ions in PbO–Ga2O3–XO2 (X=Te, Ge, Si) glasses have been examined using X-ray diffraction, FT-IR and luminescence spectroscopy. Several crystalline phases such as TeO2, PbTe3O7, PbO and PbO2 were identified in lead tellurite system using X-ray diffraction analysis, in contrast to PbO–Ga2O3–XO2 (X=Ge, Si) glass samples. Characteristic emission bands due to the 5D0 → 7F J (J =0–4) transitions of Eu3+ and the 4F9/2 → 6H J /2 (J =15, 13, 11) transitions of Dy3+ were registered. Two spectroscopic parameters, such as luminescence intensity ratios associated to 5D0 → 7F2 and 5D0 → 7F1 transitions of Eu3+ as well as 4F9/2 → 6H13/2 and 4F9/2 → 6H15/2 transitions of Dy3+, and luminescence lifetimes for excited states of rare earth ions were determined. The luminescence intensity ratios for Eu3+ and Dy3+ ions decrease, whereas 5D0 (Eu3+) and 4F9/2 (Dy3+) luminescence lifetime increases, when covalence between Ln3+ and O2− ions is reduced and the phonon energy of the host glass is increased in PbO–TeO2 →PbO–GeO2 →PbO–SiO2 direction. It was confirmed by FT-IR measurements. [Copyright &y& Elsevier]

Published
2013
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