New optical centers of triply charged cerium ions in silica gel-glasses saturated with hydrogen

Optical properties of ZnO nanoparticles synthesized by varying the sodium hydroxide to zinc acetate molar ratios using a Sol-Gel process

“…Vanheusden et al [22] proposed the mechanism of green emission and reported that green emission is due to the recombination of the electrons in singly occupied oxygen vacancies in ZnO and that the emission results due to the recombination of a photo-generated hole with an electron occupying the oxygen vacancies. It is also reported that particles surface depletion plays a major role in the density of singly ionized oxygen vacancies and the charge state of this defect and thus is controlling the green emission intensity [23,24].…”

Spectroscopic properties of Ce3+ doped silica annealed at different temperatures

“…A strong overlap of the activator 5d-orbitals with ligand orbital causes high sensitivity of their spectral characteristics to the local environment structure [1]. Many researchers have mentioned two main luminescent bands of Ce 3+ ions at 357 and 450 nm in the samples of Ce 3+ -doped glasses and crystals [1][2][3][4]. Both of the two bands were attributed to the 4f-5d transitions of triply charged cerium.…”

Luminescence property of Ce3+-doped silica decorated with S2− and Cl− anions

“…Some researchers have studied the luminescence property of Ce 3+ ions in silica [8,9], and some new luminescence centers of Ce 3+ ions in silica after heat-treated in hydrogen at high temperatures [10] were observed. To our knowledge, however, there is few report in the literature studying the effect of anions on the luminescence property of Ce 3+ ions in silica.…”