Monophasic zircon-type tetragonal Eu1 − xBixVO4 solid-solution: synthesis, characterization, and optical properties

• Complete Eu1 − xBixVO4 with zircon-type structure was successfully synthesized.
• The band gap of the samples could be adjusted and controlled by bismuth content.
• Eu1 − xBixVO4 show strong red emission under both near UV and visible-light excitation.

By combining the methods of co-precipitation and hydrothermal synthesis methods, the complete solid-solution of Eu1 − xBixVO4 with monophasic zircon-type structure was successfully synthesized. The zircon-type structure was determined by X-ray diffractometer and Raman scattering, and the optical properties were characterized by ultraviolet-visible diffuse reflectance and photoluminescence spectrophotometer. The results indicate that the band gap of Eu1 − xBixVO4 could be adjusted and controlled by bismuth content in the range of x = 0–0.9. Meanwhile, the Eu1 − xBixVO4 solid-solution phosphors show strong red light emission was shown in 619 nm under both near UV-light and visible-light excitation. Notably, the emission intensity of Eu1 − xBixVO4 (x = 0.4) is the strongest in all samples.

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