Abstract
The Pr3+ ion-doped BaY2ZnO5 phosphor with the orthorhombic structure was synthesized successfully using a sol-gel method in this study. The SEM images show that the BaY2ZnO5:Pr3+ phosphor particles are aggregational but have an isotropic distribution for 2 mol% Pr3+ ions doped. Under an excitation wavelength of 311 nm, the emission bands that appear in the emission spectra are due to the 3P0→3H4,5,6, 1D2→3H4 and 3P0→3F2 electron transition of Pr3+ ion, and it is the same as that for solid state reaction preparation. Comparing to the solid state reaction preparation, the intensities of the 3P0→3H4 transition were increased by about 6.5 times for sol-gel method. The enhancement in emission intensity is because the activators have more homogeneous contribution in host for the sol-gel method preparation. In addition, the color tone did not change very obviously, which located around the green light region for Pr3+ ion concentrations increasing. The color stability is better for sol-gel method than that for the solid state reaction preparation.
Highlights
The SEM images show that the BaY2ZnO5:Pr3+ phosphor particles are aggregational but have an isotropic distribution for 2 mol% Pr3+ ions doped
Under an excitation wavelength of 311 nm, the emission bands that appear in the emission spectra are due to the 3P0→3H4,5,6, 1D2→3H4 and 3P0→3F2 electron transition of Pr3+ ion, and it is the same as that for solid state reaction preparation
The enhancement in emission intensity is because the activators have more homogeneous contribution in host for the sol-gel method preparation
Summary
A lot of efforts have been done to discover the novel host materials as well as activators with high photoluminescence properties including emission intensity, high quantum yield and so on for phosphor applications [5] [6]. BaY2ZnO5 is an excellent host for various activator ions-doped phosphors. Some previous studies investigated the effect of the size, morphology of particles, and activator concentrations on the photoluminescence properties of BaY2ZnO5:RE3+ phosphors [11] [12] [13] [14]. According to our previous study [14], the emission spectra show that the 3P0→3H4,5,6 transitions are dominant for the Pr3+-doped BaY2ZnO5 phosphor. The color tone changes from green to greenish and yellow, as the Pr3+ ion concentration increases
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