Photoluminescent properties of Y1−xGdxVO4:Eu3+ powder phosphors

Enhanced photoluminescence of GdPO4:Tb3+ under VUV excitation by controlling ZnO content and annealing temperature

“…The increased intensity is caused by a larger crystallite size [18]. A large crystallite size provides higher oscillating strengths for the optical transitions due to the improved crystallinity, increased interaction area with the excitation light, and reduced loss [18][19][20][21]. For a low Zn 2+ content (0.015), the strongest emission was obtained for the phosphors annealed at 1000 • C. This occurred primarily because their crystallite size was larger, compared to the phosphors annealed at 800 and 900 • C, and their morphology was smooth and spherical.…”

“…For the Zn-free GdPO 4 :Tb 3 phosphors, the emission intensity increased with the annealing temperature. The increased intensity is caused by a larger crystallite size [18]. A large crystallite size provides higher oscillating strengths for the optical transitions due to the improved crystallinity, increased interaction area with the excitation light, and reduced loss [18][19][20][21].…”

VUV photoluminescence of (Y0.5Gd0.5)0.94VO4:Eu3+ red-emitting phosphors prepared by the solution combustion method

“…7 F 2 transition of Eu 3+ [2]. YVO 4 crystallizes in the tetragonal structure, belonging to the space group of I4 1 /amd (141), which is composed of YO 8 dodecahedra and VO 4 tetrahedron (T 2d ) [3,4]. The point symmetry of Y 3+ is D 2d without an inversion center.…”

“…The isostructural GdVO 4 , belonging to the same family as YVO 4 , is known to be a good host material for rare earth activators [5]. In particular, GdVO 4 :Eu 3+ has received considerable attention as a potential phosphor due to its strong absorption of UV light, effective energy transfer from VO 4 3À and has D 2d symmetry, which results in energy-level splitting of the Eu 3+ [6].…”

“…The point symmetry of Y 3+ is D 2d without an inversion center. The rare earth ion Eu 3+ occupies the Y 3+ site in YVO 4 , resulting in the hypersensitive transitions being the most prominent group in the emission spectra [4].…”