Abstract
A series of the TeO2–GeO2–ZnO glass system was single and double doped with different Tb3+/Eu3+ ratios. Their luminescent and colorimetric properties were analyzed for possible use as phosphor materials in lighting devices. The characterization by X-ray diffraction and Raman spectroscopy verified the glassy nature of the fabricated samples. The luminescent properties of the doped glasses were analyzed by means of steady-state fluorescence and time-resolved spectroscopy. The Tb3+ excitation bands observed in the codoped samples while monitoring the 700 nm emission of Eu3+, as well as the shortening of Tb3+ lifetime in presence of europium indicated a Tb3+ → Eu3+ energy transfer, which main interaction type is electric dipole–dipole, according to Inokuti–Hirayama model. The Eu3+ → Tb3+ energy transfer also occurs in the samples but with lower efficiency. The CIE1931 chromaticity coordinates, upon different excitation wavelengths, show a multicolor tunning from green to orange-red due to the lanthanide concentration ratio and the Tb3+ → Eu3+ energy transfer process.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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All authors contributed to the study conception and design. Material preparation, data collection, analysis and editing were performed by JA-R, GS-R, RCC-T, FF-D and RS-Z. The first draft of the manuscript was written by MEA-R and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Alvarez-Ramos, M.E., Alvarado-Rivera, J., Félix-Domínguez, F. et al. Multicolor green to orange-red emission of Tb3+ and Eu3+-codoped tellurite glasses: Eu3+ concentration and Tb3+ → Eu3+ energy transfer. Appl. Phys. A 129, 75 (2023). https://doi.org/10.1007/s00339-022-06347-6
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DOI: https://doi.org/10.1007/s00339-022-06347-6