An increase in the accuracy of remote temperature readout
using
luminescent thermometry is determined, among other things, by the
relative sensitivity of the thermometer. Therefore, to increase the
sensitivity, intensive work is carried out to optimize the host material
composition and select the luminescent ions accordingly. However,
the role of nanocrystal morphology in thermometric performance is
often neglected. This paper presents a systematic study determining
the role of synthesis parameters of the solvothermal method on the
morphology of YPO
4
:Yb
3+
,Nd
3+
nanocrystals
and their effect on the lifetime of Yb
3+
ion-based luminescent
thermometer performance. It was shown that by changing the RE
3+
:(PO
4
)
3–
ratio and the concentration
of Nd
3+
ions, the size, shape, and aggregation level of
the nanocrystals can be modified changing the thermometric parameters
of the luminescent thermometer. The highest relative sensitivity was
obtained for the low RE
3+
:(PO
4
)
3–
ratio and 1% Nd
3+
ion concentration.