Abstract
NaGdF4:Yb3+/Er3+ nanophosphors in the shape of a nanowire, nanoplate and nanosphere were prepared via a low-temperature solvothermal process by adjusting the ratio of oleic acid (OA) and ethanol (EtOH). Under 980 nm excitation, characteristic Er3+ ion upconversion (UC) emissions were observed, originating from the two-photon process. Compared with the other two shapes, the NaGdF4:Yb3+/Er3+ nanowires exhibited the brightest UC intensity. The optical thermometric properties of the NaGdF4:Yb3+/Er3+ nanophosphors were investigated based on the fluorescent intensity ratio (FIR) technique from two thermally coupled 2H11/2 and 4S3/2 levels. A morphology-dependent sensing sensitivity was found, which is attributed to a more disordered environment around Er3+ ions in small-sized particles.
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