Photoluminescence (PL) of YPO
4:Mn
2+ codoped with four tetravalent cations (Zr
4+, Sn
4+, Ti
4+, and Si
4+) has been investigated at room temperature under excitation with vacuum ultraviolet (VUV) photons at 147 nm. The wavelength is located at the fundamantal absorption edge of YPO
4. The concentration of all the cations was set to be 1.0 mol% in preparation. The PL spectra exhibited a blue-green (BG) band peaking at 482 nm. The PL intensity of the BG band is highest when Zr
4+ ions were codoped into YPO
4:Mn
2+, and thus Zr
4+-codoping is the best choice for PL enhancement in YPO
4:Mn
2+ phosphors. It was found that the PL intensity of Zr
4+ doped YPO
4:Mn
2+ reached 80% of that of a well-known VUV phosphor BaMgAl
10O
17:Eu
2+, unless the concentration of Mn
2+ and Zr
4+ ions was not optimaized.
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