Processing and luminescence properties of Ce:Y3Al5O12 and Eu:Y3Al5O12 ceramics for white-light applications

Unraveling the Origin of Photocatalytic Deactivation in CeO2/Nb2O5 Heterostructure Systems during Methanol Oxidation: Insight into the Role of Cerium Species

“…As far as differences in recombination of charge carriers are concerned, it is worth noting that improved emission of the Ce1/Nb 2 O 5 catalyst at 545 nm may result not only from the presence of oxygen vacancies but also Ce 3+ ions where the broad emission can be expected from 400 to 650 nm, depending on the host compound. Similar emission spectra were recorded for Y 3 Al 2 Ga 3 O 12 :Ce 3+ ceramics and Sr 3 AlO 4 F:Ce 3+ phosphors, where the maximum of Ce 3+ emission occurred at around 500–550 nm due to the 5d 1 - 2 F 5/2 and 5d 1 - 2 F 7/2 transitions. − As described in the XPS section, relative contribution of Ce 3d peaks typical of ceria defect sites (e.g., Ce 3+ ions and/or Ce 4+ ions surrounded by oxygen vacancies in which electrons are trapped; peaks labeled as u 0 , u′ and v 0 , v′ in Figure ) was significantly higher for all ceria-modified Nb 2 O 5 catalysts than that observed for commercial CeO 2 . Thus, the presence of some Ce 3+ ions in niobia-based samples is very probable.…”

Emission tunability and local environment in europium-doped OH−-free calcium aluminosilicate glasses for artificial lighting applications

“…From the point of view of materials science, tailoring of the surrounding ions' crystal field is essential in order to control the luminescence behavior. Consequently, many different materials have been developed for solid-state lighting, including crystals [2], ceramics [8], polymers [3,9], and glasses [1,7,10e12]. Specifically, the amorphous nature of glasses means that their broad luminescence properties are influenced by the average local crystal field surrounding the dopant ions.…”

Express Synthesis of YAG:Ce Ceramics in the High-Energy Electrons Flow Field

“…Therefore, the existing methods implement a synthesis at temperatures lower than those necessary to melt the component with the lowest temperature. The most widespread is the solid-phase method for the synthesis of YAG phosphors, with various modifications [1][2][3][4]. The initial procedure in this method is the sintering of ceramics from Y2O3 and Al2O3 powders with activators, for example, Ce2O3 using Ba, Na, K, and H3BO3 fluorides as binders at 1300-1600 °C.…”