Photoluminescence properties of La(PO3)3:Tb under VUV excitation |
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Authors: | Yuhua Wang Dan Wang |
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Affiliation: | aDepartment of Materials Science, Lanzhou University, Lanzhou 730000, China |
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Abstract: | La1−x(PO3)3:Tbx3+ (0<x0.6) were prepared using solid-state reaction. The vacuum ultraviolet (VUV) excitation spectrum of La0.55(PO3)3:Tb0.453+ indicates that the absorption of (PO3)33− groups locates at about 163 and 174 nm and the absorption bands of (PO3)33− groups (174 nm) and La3+–O2− (200 nm) and Tb3+ (213 nm) overlap each other. These results imply that the (PO3)33− groups can efficiently absorb the excited energy around 172 nm and transfer the energy to Tb3+. Under 172 nm excitation, the optimal photoluminescence (PL) intensity is obtained when Tb concentration reaches 0.45 and is about 71% of commercial phosphor Zn1.96SiO4:0.04 Mn2+ with chromaticity coordinates of (0.343, 0.578) and the decay time of about 4.47 ms. |
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Keywords: | La(PO3)3:Tb3+ Optical properties Vacuum ultraviolet excitation |
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