In this study, solid-state solutions of yttrium orthovanadate-phosphate
with varying concentrations of codopants (Eu
3+
, Bi
3+
) have been obtained via coprecipitation. An ionic radii
mismatch between V
5+
and P
5+
substituents is
manifested in broad XRD lines. The sharpening of the XRD lines is
observed with increasing bismuth ions concentration in the Eu
3+
codoped YV
0.5
P
0.5
O
4
matrix.
The difference in the number of the Stark components for the
5
D
0
→
7
F
J
transitions
indicates changes in the lattice and a number of possible Eu
3+
sites. A thorough, systematic spectroscopic analysis of YV
0.5
P
0.5
O
4
:
x
mol % Eu
3+
,
y
mol % Bi
3+
was conducted at room
temperature and 5 K. Metal-to-metal energy transfers occurring between
Eu
3+
, V
5+
, and Bi
3+
optically active
ions have been investigated. Additionally, efficiency of the Bi
3+
-Eu
3+
energy transfer (ET) was calculated.