Synthesis and cathodoluminescent properties of Lu3(Al,Ga)5O12:Tb3+ with and without niobium-doped TiO2 coating

• Published in: Journal of sol-gel science and technology 2016-02, Vol.77 (2), p.355-360
• Main Authors: Zhu, Xian-Zhong, Chu, Cheng-Lin, Chu, Paul K.
• Format: Article
• Language: English
• Subjects: Anatase; Ceramics; Chemical bonds; Chemical synthesis; Chemistry and Materials Science; Composites; Crystal structure; Glass; High temperature; Inorganic Chemistry; Materials Science; Nanoparticles; Nanotechnology; Natural Materials; Niobium; Optical and Electronic Materials; Organic chemistry; Original Paper; Phosphors; Titanium dioxide
• ISSN: 0928-0707; 1573-4846
• DOI: 10.1007/s10971-015-3861-7

(Lu 0.95 Tb 0.05 ) 3 (Al 0.80 Ga 0.20 ) 5 O 12 (LuAGG:Tb) phosphor is synthesized by a high-temperature solid-state reaction, and a thin layer of niobium-doped TiO 2 (NTO) is deposited on the phosphor particles by coprecipitation-assisted solvothermal synthesis. The crystal structure, micromorphology, chemical bonding, and cathodoluminescent (CL) properties of both the uncoated and NTO-coated phosphors are determined. The phosphor powders possess a single phase, and the average diameter of the particles is about 3 μm. NTO nanoparticles with the anatase crystal structure are connected to the phosphor particles electrostatically. Both types of phosphors exhibit the characteristic emission spectrum of Tb 3+ under electron excitation. The CL intensity decreases, whereas the resistance to luminance saturation and degradation increases with the coating. Graphical Abstract