• Bing Yan

      Articles written in Bulletin of Materials Science

    • Sol–gel synthesis and photoluminescence of CaTi1–𝑥Zr𝑥O3 : Pr3+ phosphors

      Lixia Lin Bing Yan

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      CaTi1–𝑥Zr𝑥O3 : Pr3+ phosphors have been synthesized by sol–gel and solid state methods, with 𝑥 = 1/300, 2/300, 3/300, 4/300, 5/300, 6/300, 7/300, respectively. Powder X-ray diffraction (XRD), UV-visible absorption spectra, photoluminescent spectra (PL), and scanning electron microscopy (SEM) images are used to characterize the powder samples. The inverse absorption at 610 nm appearing in the UV-visible absorption spectra is due to the ${}^{1}D_{2} \rightarrow {}^{3}H_{4}$ characteristic emission of Pr3+. Changes in the emission spectra at 610 nm were agreed with those in UV-visible absorption spectra. The strongest red excitation obtained from CaTi1–𝑥Zr𝑥O3 : Pr3+ (𝑥 = 4/300) and CaTi1–𝑥Zr𝑥O3 : Pr3+ (𝑥 = 5/300) possesses the strongest emission at 610 nm, similar to the intensities of Ca(Ti1–𝑥Zr𝑥)O3 : Pr3+ (𝑥 = 3/300, 4/300, 6/300), which may be corresponded to the cell parameters of CaTi1–𝑥Zr𝑥O3 : Pr3+.

    • Solid state synthesis and photoluminescence of Sr3Y(P𝑥V1−𝑥O4)3: Eu3+ submicrocrystalline rod

      Xiuzhen Xiao Bing Yan

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      Using rare earth coordination polymers with ortho-hydroxylbenzoic acids as rare earth species and composing with organic polymers as the hybrid precursors, Sr3Y(P𝑥V1−𝑥O4)3: Eu3+ (𝑥 = 0.1, 0.3, 0.5, 0.7, 0.9) phosphors has been synthesized. These phosphors present the column-like particles with a width of 250 nm and a length of 1 𝜇m. The value of red emission to orange emission for Eu3+ varies with the V content, indicating that the RO (red/orange) value increases with the increase of V content due to the lower electronegativity of V. Sr3Y(P0.3V0.7O4)3 has been shown to be the best composition among different compositions. Furthermore, the concentration quenching of Eu3+ in Sr3Y(P0.3V0.7O4)3 took place and the optimum concentration of Eu3+ is 5 mol % in the range of 1–9 mol %.

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