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