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In the present work, the Tb 3+ /Eu 3+ co-activated sol-gel glass-ceramic materials (GCs) containing MF 3 (M = Y, La) nanocrystals were fabricated during controlled heat-treatment of silicate xerogels at 350 °C. The studies of Tb 3+ → Eu 3+ energy transfer process (ET) were performed by excitation and emission spectra along with luminescence decay analysis. The co-activated xerogels and GCs exhibit multicolor emission originated from 4f n -4f n optical transitions of Tb 3+ ( 5 D 4 → 7 F J , J = 6-3) as well as Eu 3+ ions ( 5 D 0 → 7 F J , J = 0-4). Based on recorded decay curves, it was found that there is a significant prolongation in luminescence lifetimes of the 5 D 4 (Tb 3+ ) and the 5 D 0 (Eu 3+ ) levels after the controlled heat-treatment of xerogels. Moreover, for both types of prepared GCs, an increase in ET efficiency was also observed (from η ET ≈ 16% for xerogels up to η ET = 37.3% for SiO 2 -YF 3 GCs and η ET = 60.8% for SiO 2 -LaF 3 GCs). The changes in photoluminescence behavior of rare-earth (RE 3+ ) dopants clearly evidenced their partial segregation inside low-phonon energy fluoride environment. The obtained results suggest that prepared SiO 2 -MF 3 :Tb 3+ , Eu 3+ GC materials could be considered for use as optical elements in RGB-lighting optoelectronic devices operating under near-ultraviolet (NUV) excitation.

Energy Transfer Study on Tb3+/Eu3+ Co-Activated Sol-Gel Glass-Ceramic Materials Containing MF3 (M = Y, La) Nanocrystals for NUV Optoelectronic Devices