resumo
Doped zinc silicate nanoparticles (Zn2SiO4) embedded in the SiO2 host matrix, were prepared by the sol-gel method. First, doped zinc oxide (ZnO) nanoparticles were synthesized by the solvothermal route and then confined in a monolithic silica (SiO2) matrix by the sol-gel route. Finally, SiO2/Zn2SiO4:X (X = Mn, V, and Ca) nanocomposites were obtained by a simple solid-state reaction for 2 h at 1200 degrees C under a natural atmosphere. Structural, morphological, and optical properties of the different samples were investigated. The X-ray diffraction (XRD) pattern showed that rhombohedral alpha-Zn2SiO4 is the most dominant crystalline phase at high temperatures for all samples. Transmission electron microscopy (TEM) images revealed that the average grain size of the samples is about 70 nm. Photoluminescence (PL) spectra depict the presence of wide visible range emission; yellow, green, and red for Mn, V, and Ca respectively. The obtained results make doped-Zn2SiO4 nanophosphor a potential candidate for optoelectronic devices. For the different samples, the PL intensity increases linearly when the measurement temperature decreases. In light of this observation, it can be predicted that this material is promising for several technological applications, in particular for non-contact luminescence thermometry.
palavras-chave
ZINC SILICATE NANOPHOSPHOR; OXYGEN HOLE-CENTERS; OPTICAL-PROPERTIES; YELLOW EMISSION; EU3+; NANOPARTICLES; PHOTOLUMINESCENCE; SENSITIVITY; COMPOSITE; IONS
categoria
Optics
autores
Bessadok, MN; Ananias, D; Bouri, A; Bouzidi, C; Barthou, C; El Mir, L
nossos autores
Duarte Ananias
Investigador Auxiliaragradecimentos
This work is financially supported, by the Tunisian Ministry of Higher Education and Scientific Research (PRF 2019-D4P2) .