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 980nm 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 573K were obtained by measuring the temperature dependent fluorescence intensity ratio (FIR) of the FUC green emissions at 531 and 554nm originated from two thermally coupled 2H11/2 and 4S3/2 emitting energy levels. A temperature-sensing sensitivity of 0.013K−1 at 573K was obtained experimentally and the obtained energy difference ΔE was 971cm−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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