Non-contact thermometer behavior of (Y 0.5 In 0.5 ) 2 O 3 :Yb 3+ ,Er 3+ solid solution.

Oxides are physically and chemically stable. Non-contact thermometer-Yb 3+ -Er 3+ ions co-doped solid solution (Y 0.5 In 0.5 ) 2 O 3 , is prepared by the regular solid method. The structural results obtained by XRD indicate that a pure phase solid solution (Y 0.5 In 0.5 ) 2 O 3 has been obtained. The solid solution (Y 0.5 In 0.5 ) 2 O 3 has a similar crystal structure, especially Y 2 O 3 and In 2 O 3 with the same space group ( Ia 3̄). Green emission from 500 to 600 nm is due to Er 3+ 4f-4f transitions: 4 S 3/2 → 4 I 15/2 at 567 nm and 2 H 11/2 → 4 I 15/2 at 528 nm. Red emissions from 630 to 720 nm are attributed to Er 3+ : 4 F 9/2 → 4 I 15/2 . UC luminescence changes greatly with laser diode power and Er 3+ and Yb 3+ content. Furthermore, the two-photon process is confirmed to be dominant between Yb 3+ and Er 3+ in oxide solid solution (Y 0.5 In 0.5 ) 2 O 3 . Optical temperature sensitivity is also investigated systematically in order to explore the application of the oxide solid solution (Y 0.5 In 0.5 ) 2 O 3 . The temperature-dependent green fluorescence at 528 and 567 nm was investigated with the range of 313-573 K. 0.316% K -1 is the maximum absolute sensitivity at 503 K, which is higher than most Yb 3+ /Er 3+ co-doped systems. In addition, the solid solution (Y 0.5 In 0.5 ) 2 O 3 :Yb 3+ ,Er 3+ has better thermal stability and stronger UC emission than a simple substance with excellent temperature sensing performance. It indicates that Yb 3+ -Er 3+ ions co-doped (Y 0.5 In 0.5 ) 2 O 3 solid solution is a good candidate for optical temperature sensing.