Unusual Eu3+ luminescent properties in alkaline lanthanum fluorogermanate glasses and glassceramics
Abstract
Lanthanum fluorogermanate glass samples were prepared by melt-quenching in ternary compositions 55GeO2–15M2O–30LaF3, M being K or Na and doped with 0.25 mol% of Eu2O3. Thermal analysis by differential scanning calorimetry (DSC) technique allowed us to determine both glass transition and crystallization temperatures in bulk and powder samples. Heat treatments (HTs) were performed on the basis of DSC curves with increasing HT time and temperature, and glass–ceramics were obtained in both systems. In the potassium-based glass composition, cubic KLaF4 is precipitated for lower HT temperatures. However, for the sodium-based glass, hexagonal NaLaF4 is first precipitated at lower temperatures, whereas hexagonal fluorecite LaF3 is also crystallized at higher temperatures. Eu3+ spectroscopy identified strong emission dependency with the crystallization state and nature of crystalline phases. Emission bands related to electronic transitions from the 5D2 and 5D1, usually not observed in oxide and even oxyfluoride glasses, were clearly identified and with relative strong intensity together with the well-known Eu3+ red emissions, pointing out unusual effective Eu3+ blue and green emission in these glass–ceramics. Experimental lifetimes were useful to identify different Eu3+ sites related with oxide/fluoride as well as glassy/crystalline environments.
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BibTeX
@article{faleiros2026unusual,
title = {{Unusual Eu3+ luminescent properties in alkaline lanthanum fluorogermanate glasses and glassceramics}},
author = {Raphael Rodrigues Faleiros and Ana Flávia Teófilo da Silva and Yago Langer Campos de Lima and Fabia Castro Cassanjes and Marc Dussauze and Thierry Cardinal and Lauro June Queiroz Maia and Gael Poirier},
journal = {Journal of the American Ceramic Society},
year = {2026},
month = nov,
doi = {10.1111/jace.71392},
url = {https://hal.science/hal-05855293v1},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - JOUR
TI - Unusual Eu3+ luminescent properties in alkaline lanthanum fluorogermanate glasses and glassceramics
AU - Raphael Rodrigues Faleiros
AU - Ana Flávia Teófilo da Silva
AU - Yago Langer Campos de Lima
AU - Fabia Castro Cassanjes
AU - Marc Dussauze
AU - Thierry Cardinal
AU - Lauro June Queiroz Maia
AU - Gael Poirier
PY - 2026
DA - 2026/11/06
JO - Journal of the American Ceramic Society
DO - 10.1111/jace.71392
UR - https://hal.science/hal-05855293v1
AB - Lanthanum fluorogermanate glass samples were prepared by melt-quenching in ternary compositions 55GeO2–15M2O–30LaF3, M being K or Na and doped with 0.25 mol% of Eu2O3. Thermal analysis by differential scanning calorimetry (DSC) technique allowed us to determine both glass transition and crystallization temperatures in bulk and powder samples. Heat treatments (HTs) were performed on the basis of DSC curves with increasing HT time and temperature, and glass–ceramics were obtained in both systems. In the potassium-based glass composition, cubic KLaF4 is precipitated for lower HT temperatures. However, for the sodium-based glass, hexagonal NaLaF4 is first precipitated at lower temperatures, whereas hexagonal fluorecite LaF3 is also crystallized at higher temperatures. Eu3+ spectroscopy identified strong emission dependency with the crystallization state and nature of crystalline phases. Emission bands related to electronic transitions from the 5D2 and 5D1, usually not observed in oxide and even oxyfluoride glasses, were clearly identified and with relative strong intensity together with the well-known Eu3+ red emissions, pointing out unusual effective Eu3+ blue and green emission in these glass–ceramics. Experimental lifetimes were useful to identify different Eu3+ sites related with oxide/fluoride as well as glassy/crystalline environments.
SN - 0002-7820
SN - 1551-2916
ER -