Ukrainian Chemistry Journal, Journal Year: 2024, Volume and Issue: 90(11), P. 25 - 34
Published: Dec. 27, 2024
This study investigates there gularities of obtaining phosphate-germanate glass modified with molybdenum(VI) oxide, the following composition: (45-0.5x)P2O5-xMoO3-10.0GeO2-(45-0.5x)Na2O (x = 0.0-30.0). It was found that an increase in concentration MoO3from 5 to 30 mol% leads a reduction width forbidden band sulting amorphous materials, from 3.53 eV 3.42 eV. change is accompanied by decrease hygroscopicity and enhancement solubility respect Eu2O3 when subjected other maltreatment at 1000 °C for 4 hours. The effect MoO3 on structure has been examined first time. Within molybdenum content range 5–15 mol%, incorporated existing polyphosphate chains, which results structural modifications. However, reaches 15–30 density increases ρ 2.51 2.58 g/cm3. attributed formation additional facilitated higher coordination capacity MoO66- compared phosphate groups. also demonstrated under goes significant changes as result increasing content, plays keyrole net work formation. method rapid cooling salt melt used produce glass, followed quenching samples copper plate. resulting materials were characterized combination advanced techniques, including frared (IR) luminescence spectroscopy, diffuse reflectance X-ray powder diffraction analysis, providing comprehensive insights their optical properties. shown most promising material modeling red phosphors 39.5P2O5-10MoO3-10.0GeO2-39.5Na2O-1Eu2O3, effectively excited UV radiation. Among spectral features obtained luminescent characteristics should be noted: 1) In 550–650 nm, it demonstrates highly intense bands electronic transitions 5D0→7F1 (595 nm) 5D1→7F2 (614 nm), are asymmetry structure; b) absence Stark splitting corresponding 550–750 nm confirms nature systems. emission maximum lies 615 indicating potential application glasses phosphors.
Language: Английский
