LAUSR

Abstract In this work, Yb3+/Tm3+co-doped scheelite phosphors (NaGd(MoO4)2) are fabricated and explored as a potential temperature sensing material. The blue (1G4 → 3H6) and deep red (3F2, 3 → 3H6) emission bands of Tm3+ ions exhibit opposite thermal dependent property, and therefore provide a self-referenced temperature sensing signals. Herein, we investigate the crucial factors for actualizing high temperature sensitivity in this system, and find that the temperature sensitivity can be well modified by manipulating the cross-relaxation between Tm3+ ions. Finally, an optimized thermometric performance with the maxium relative sensitivity (Sr) of 1.86% K−1 at about 445 K–467 K is achieved, which is superior to previous upconverting thermometry.