NaSr2Nb5O15:Yb3+, Ho3+, Tm3+ transparent glass ceramics: Up-conversion optical thermometry and energy storage property

Rare earth tri-doped precursor glasses (PGs) were prepared by traditional high-temperature melting method, and NaSr2Nb5O15 transparent glass-ceramic (GC) was obtained by subsequent heat treatment. Results exhibit that the up-conversion emission intensity of GC is greatly enhanced compared to PG. Benefiting from the multiple emission bands from Ho3+ and Tm3+ and their different temperature dependence, multi-ratio optical temperature measurement is realized. The ultimate relative sensitivity (S-r(-max)) can reach 2.00% K-1 between 298 and 598 K. It provides a possibility for self-reference temperature measurement. Furthermore, under the actual charging and discharge conditions, the GC heated at 750 degrees C has great energy density (W-d = 1.15 J/cm(3)@600 kV/cm) and high-power density (P-d = 290.4 MW/cm(3)@600 kV/cm) with ultrafast discharge time (<15.8 ns). The previous results indicate that the obtained GC with good multifunctional properties is expected to be applied in the field of photoelectric conversion.