Abstract
Novel tungsten bronze Ba4Gd0.65-xEr0.02YbxNb10O30 (0 ≤ x ≤ 0.1) phosphors were synthesized. Their phase and structure were characterized and analyzed by X-ray diffraction (XRD) and Rietveld structural refinements. Under 980 nm excitation, bright frequency up-conversion (FUC) green and weak red emissions were observed. The concentration of Yb3+ had an important influence on the FUC luminescence properties and a possible UC mechanism was proposed. Temperature sensing properties of the Ba4Gd0.55Er0.02Yb0.1Nb10O30 phosphor in the range from 303 to 573 K were obtained by measuring the temperature dependent fluorescence intensity ratio (FIR) of the FUC green emissions at 531 and 554 nm originated from two thermally coupled 2H11/2 and 4S3/2 emitting energy levels. A temperature-sensing sensitivity of 0.013 K−1 at 573 K was obtained experimentally and the obtained energy difference ΔE was 971 cm−1, indicating that this material can be utilized as a promising candidate for the future optical temperature sensors of high accuracy and resolution.
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