Ultraviolet Upconversion Luminescence in a Highly Transparent Triply-Doped Gd3+–Tm3+–Yb3+ Fluoride–Phosphate Glasses
2018
Galleani, Gustavo | Santagneli, Silvia Helena | Ledemi, Yannick | Messaddeq, Y. (Younés) | Janka, Oliver | Pöttgen, Rainer | Eckert, Hellmut
We report near-infrared to ultraviolet (UV) upconversion emissions in triply-doped Gd³⁺–Tm³⁺–Yb³⁺ fluoride–phosphate glasses. Emission at 310 nm, originated from the Gd³⁺:⁶P₇/₂ → ⁸S₇/₂ transition, was observed for the first time in glasses. The high-purity glasses prepared exhibit extended transparency in the UV down to 200–250 nm. The mixed fluoride–phosphate environment of the rare-earth ions was characterized by means of NMR techniques using scandium as a diamagnetic mimic for the luminescent species, for which the ligand distribution was quantified by ⁴⁵Sc{³¹P} rotational echo double-resonance NMR. Both the intensity of the Gd³⁺ emission as well as those of the UV emissions at 290, 347, and 363 nm increase with increasing ratio of fluoride to phosphate ligands coordinating to the rare-earth ion.
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