Abstract
Many efforts have been devoted to contactless optical thermometry because of their apparent advantages. The phosphors with double perovskite structure are considered good hosts for luminescence according to many related research. Herein, Yb3+/Er3+ co-doped Ba2GdNbO6 phosphors were successfully prepared and showed good up-conversion performance. Furthermore, the phosphors could achieve tunable luminescence by adjusting the calcination temperature or introducing proper Ca2+/Sr2+ ions. The intensity of green emissions increases with calcination temperature, while the red emissions increase by incorporating Ca2+/Sr2+ ions. The properties of optical thermometry based on the fluorescence intensity ratio (FIR) method of Er3+ at thermally coupled levels (2H11/2/4S3/2) were also explored in the range of 300–570 K. The maximum relative sensitivity (SR) of Yb3+/Er3+/Sr2+ tri-doped Ba2GdNbO6 sample reach 1.01 % K−1, which is higher than that of Yb3+/Er3+ co-doped Ba2GdNbO6 sample (0.78 % K−1). The research shows that the phosphors are prospective applications in temperature sensing.
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