Enhanced up-conversion luminescence and optical thermometry characteristics of Er3+/Yb3+co-doped Sr10(PO4)6O transparent glass-ceramics

In this paper, the Yb3+/Er(3+)co-doped parent glass (PG) with composition (in mol%) of 30P(2)O(5)-10B(2)O(3)-38SrO-22K(2)O and transparent glass-ceramics (GCs) containing hexagonal Sr-10(PO4)(6)O nanocrystals (NCs) were synthesized for the first time by melt-quenching method and subsequent heating treatment in air. Under 980 nm laser prompting, the GCs samples showed intense red and green up-conversion emissions compared to those characteristics for the PG sample. The emission intensities varied with Er(3+)concentration and heat treatment conditions. Furthermore, in Yb3+/Er(3+)co-doped GCs specimens, the optical thermometry was researched by means of fluorescence intensity ratio (FIR) of(4)S(3/2)and(2)H(11/2)levels. The GC sample heated at 620 degrees C for 5 hours possessed a high relative temperature sensitivity (S-r) of 0.769% K(-1)at 303 K and the maximal absolute temperature sensitivity (S-a) of 5.951 x 10(-3) K(-1)at 663 K, respectively. It is expected that the as-fabricated GC materials with Sr-10(PO4)(6)O NCs are promising efficient up-conversion materials for optical temperature sensor.