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Article dans une revue

Composition dependence of luminescence of Eu and Eu/Tb doped silicate glasses for LED applications

Abstract :

The Eu and Eu/Tb doped silicate glasses are good candidates for light emitting diode (LED) applications. But the optical performance of these glasses is sensitive to variations in chemical composition. In this paper we report our recent findings about the effect of addition of minor components such as B2O3, Al2O3 and CaF2 on the luminescent properties of the above-mentioned glasses. We explore the role of Eu3+ ions as a structural probe of the glasses by determining the asymmetry factor, i.e., the ratio of the emission intensity of the 5D0→7F25D0→7F2 transition to that of the 5D0→7F15D0→7F1 transition. The results show that the asymmetry factor and luminescence lifetimes of as-prepared materials are dependent on composition. White fluorescence is achieved in Eu/Tb co-doped glasses, which can be attributed to the simultaneous generation of red, green and blue wavelengths from Eu3+ and Tb3+ ions. The variation of the excitation wavelength can tune the emission spectra as well as Commission Internationale de L’Eclairage (CIE) chromaticity coordinates of Eu/Tb co-doped glasses for specific applications. The energy transfer from Tb3+ to Eu3+ ions is investigated by analyzing fluorescence spectra and decay curves.

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https://hal.univ-angers.fr/hal-03208362
Contributeur : Okina Université d'Angers <>
Soumis le : lundi 26 avril 2021 - 14:48:35
Dernière modification le : mardi 27 avril 2021 - 03:30:41

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Chaofeng Zhu, Stéphane Chaussedent, Shujiang Liu, Yanfei Zhang, André Monteil, et al.. Composition dependence of luminescence of Eu and Eu/Tb doped silicate glasses for LED applications. Journal of Alloys and Compounds, Elsevier, 2013, 555, pp.232-236. ⟨10.1016/j.jallcom.2012.12.052⟩. ⟨hal-03208362⟩

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