Primary thermometers based on sol–gel upconverting Er3+/Yb3+ co-doped yttrium tantalates with high upconversion quantum yield and emission color tunability

This study investigates how rare earth ion (RE 3+ ) concentration affects stabilization of the crystalline structure and infrared-to-visible upconversion (UC) in Er 3+ /Yb 3+ co-doped yttrium tantalates, synthesized by the sol–gel method. Under 980 nm, the samples exhibited intense UC luminescence....

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