TY - JOUR
T1 - Low-temperature synthesis of YVO4
T2 - Bi3+, Eu3+ nanoparticle phosphors using a methanol solution of trivalent cations
AU - Ohno, Takayuki
AU - Iso, Yoshiki
AU - Isobe, Tetsuhiko
PY - 2016
Y1 - 2016
N2 - A homogeneous solution of Y3+, Bi3+, and Eu3+ in methanol was used for low-temperature (70°C) synthesis of YVO4:Bi3+, Eu3+ nanoparticles. X-ray diffraction and fluorescence analyses revealed phase-pure tetragonal YVO4:Bi3+, Eu3+. Transparent colloidal solutions were prepared having well-dispersed ∼8-nm YVO4:Bi3+, Eu3+ nanoparticles. Increases in elemental Bi content at the constant Eu content increased the lattice spacing linearly. This reveals that Bi3+, which is larger than Y3+ and Eu3+, substitutionally incorporated in YVO4:Eu3+. The absorption edges and photoluminescence excitation edges were red-shifted by doping Bi3+ in YVO4:Eu3+, and red emission from Eu3+ was observed under near-ultraviolet excitation. These results indicate that Bi3+ and Eu3+ were successfully co-doped into the YVO4 host crystal. Concentration quenching was not observed with increasing Bi-doping even until 6.5 at%, although the quenching of bulk YVO4:Bi3+, Eu3+ prepared by solid-state reaction was observed with >3 at% in a previous report. This implies a better chemical homogeneity of Bi in the host crystal or a structural disorder which prevents the energy migration between Bi3+.
AB - A homogeneous solution of Y3+, Bi3+, and Eu3+ in methanol was used for low-temperature (70°C) synthesis of YVO4:Bi3+, Eu3+ nanoparticles. X-ray diffraction and fluorescence analyses revealed phase-pure tetragonal YVO4:Bi3+, Eu3+. Transparent colloidal solutions were prepared having well-dispersed ∼8-nm YVO4:Bi3+, Eu3+ nanoparticles. Increases in elemental Bi content at the constant Eu content increased the lattice spacing linearly. This reveals that Bi3+, which is larger than Y3+ and Eu3+, substitutionally incorporated in YVO4:Eu3+. The absorption edges and photoluminescence excitation edges were red-shifted by doping Bi3+ in YVO4:Eu3+, and red emission from Eu3+ was observed under near-ultraviolet excitation. These results indicate that Bi3+ and Eu3+ were successfully co-doped into the YVO4 host crystal. Concentration quenching was not observed with increasing Bi-doping even until 6.5 at%, although the quenching of bulk YVO4:Bi3+, Eu3+ prepared by solid-state reaction was observed with >3 at% in a previous report. This implies a better chemical homogeneity of Bi in the host crystal or a structural disorder which prevents the energy migration between Bi3+.
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U2 - 10.1149/2.0141609jss
DO - 10.1149/2.0141609jss
M3 - Article
AN - SCOPUS:84983591521
VL - 5
SP - R142-R145
JO - ECS Journal of Solid State Science and Technology
JF - ECS Journal of Solid State Science and Technology
SN - 2162-8769
IS - 9
ER -