Ultraviolet-C light has significant application prospects in the fields of disinfection, air purification, etc. Herein, an effective UVC upconversion phosphor Y
2
SiO
5
:Pr
3+
was successfully prepared, as evidenced by the XRD results. The diffuse reflection spectra of Y
2
SiO
5
: Pr
3+
phosphors presented two distinct absorption bands corresponding to the electron transitions of
3
H
4
→
3
P
2
and
3
H
4
→
1
D
2
, and the
E
g
was determined to be 4.22 eV for the Y
2
SiO
5
host, which is very close to the
E
g
(4.172 eV) calculated by DFT. Under the excitation of 460 nm laser, two emission peaks centered at ~247 nm and ~ 258 nm were found in the range of 230-280 nm, which are attributed to the transitions of 4
f
5
d
→
3
H
4
and 4
f
5
d
→
3
H
5
of Pr
3+
ions. With the help of temperature-dependent emission spectra, the phosphor demonstrated impressive thermal stability up to 150 °C. These findings indicate that the Y
2
SiO
5
: Pr
3+
phosphor has the potential application in disinfection.
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