Design of opposite thermal behaviors in Tm3+/Eu3+ co-doped YVO4 for high-sensitivity optical thermometry

Temperature-induced redshift of the V-O charge transfer band edge and the temperature quenching effect were combined for designing ratiometric optical thermometry. Following this approach, opposite thermal behaviors of T m 3 + and E u 3 + emissions were realized in the range of 300 to 380 K in T m 3 + / E u 3 + co-doped Y V O 4 . Applying the temperature dependent fluorescence intensity ratio of E u 3 + to T m 3 + as temperature readout, the maximal relative sensitivity reaches up to 4.6 % K − 1 around 330 K. This result makes our proposed strategy an excellent candidate for developing high-sensitivity optical thermometry.