Sol–gel synthesis and the luminescent properties of CaNb2O6 phosphor powders

Novel photoluminescent properties of LiGaO2 nanoflakes

“…3b, associated with the higher absorbing intensity of the tetrahedral gallium group. The high photoluminescence performance may result from improved crystallinity leading to higher oscillating strengths [16] or reduced internal reflections of the emitted light due to rougher surfaces [17]. The compounds LiGaO 2 and GaBO 3 have luminescence centers at tetrahedral and octahedral sites, with broad emission bands at 360 and 460 nm, respectively [18].…”

Effect of Reaction Rate and Calcination Time on CaNb2O6 Nanoparticles

“…The dielectric constant initially remains steady, starts falling from 95 ∘ C, and becomes stable after 135 ∘ C. This behavior is unlikely due to the phase transitions and may be related to the luminescence property [18]. After 135 ∘ C, no further change in the dielectric variation was observed.…”

Hydrothermal Synthesis of a CaNb2O6 Hierarchical Micro/Nanostructure and Its Enhanced Photocatalytic Activity

“…[39] Synthetic methods of CaNb 2 O 6 in the current literature are all limited to high-temperature calcination, the sol-gel method, and molten-salt reaction. [29,36,38,40] In our work, based on the reaction between a more reactive Nb precursor and Ca 2+ in a hydrothermal process, a CaNb 2 O 6 hierarchical micro/nanostructure was obtained without templates or organic additives. We have investigated the effect of reaction conditions including pH value, reaction time, temperature, and reactant concentration on the growth and morphology of CaNb 2 O 6 products.…”

“…[27] Although the photocatalytic activity of these niobates has been confirmed by theoretical calculation and experiments, the cumbersome synthesis conditions limited their practical applications. Currently, most niobates are synthesized by traditional solid-state reaction (SSR) and related methods, such as the polymerized complex (PC) method, [25,28] sol-gel method, [29,30] and the molten salt route. [31] The products obtained by the SSR method are generally bulk materials with low active surface area and wide size distribution.…”

“…[18b,27] Because of polyesterification between citric acid and ethylene glycol in the PC and solgel methods, expensive Nb sources are always required, such as NbCl 5 and Nb(OC 2 H 5 ) 5 . [8,29] The final calcination process is inevitable and causes a loss of active surface area. Usually, awkward Nb 2 O 5 treatments are needed, in order to obtain soluble and more reactive hydrated Nb 2 O 5 ·nH 2 O, which is also called "niobic acid", for example fusing Nb 2 O 5 at 400°C with KOH and dissolving Nb 2 O 5 in concentrated HF solution.…”