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We prepared Eu3+- and Sm3+-doped YNbO4 phosphor powders using a simple solid-state reaction method and examined their photoluminescence properties in order to investigate the possibility for their usage in phosphor thermometry. Photoluminescence measurements were performed in the temperature range 303–773K, and the fluorescence intensity ratio of the paired emissions lines was studied as a function of temperature. The results have shown that YNbO4:Eu3+ possesses the absolute sensitivity of approximately 3Ã?10−3 K−1 at about 700K, while relative sensitivity changes within the range of 0.5–2.7%K−1. YNbO4:Sm3+ has the maximum sensitivity of around 7Ã?10−4 K−1 at about 700K with the relative sensitivity of 0.43%K−1 around 500K. Calculated temperature sensitivities of samples show that these materials have a good potential for the development of thermographic phosphors. Experimental lifetime measurements recorded at 303–773K were fitted using a temperature dependent charge transfer model, TDCT. This model yields good agreement between experimental and fitted lifetime data. The sample crystalline structure is confirmed by XRD measurements. [ABSTRACT FROM AUTHOR]

Abstract: We prepared an efficient YNbO4:Eu3+ phosphor using a simple solid-state reaction method and examined its photoluminescent properties in order to investigate the possibility for its usage in phosphor thermometry. Photoluminescence measurements were performed in the temperature range 303–803 K, and the fluorescence intensity ratio (FIR) of the paired emissions lines of Eu3+ (5D1 → 7F1 and 5D0 → 7F1 transitions) was studied as a function of temperature. The sample crystalline structure is confirmed by XRD measurements. The material is proved to have a good potential for the development of thermographic phosphors. It exhibits maximum temperature sensitivity of approximately 3.5 × 10−3 K−1 in the temperature region around 700 K. [Copyright &y& Elsevier]