Temperature Dependent Up-Conversion Luminescence Properties of Er³⁺ Doped KNN Ultrafine Powders Prepared by Pulsed Laser Ablation in Liquid

Abstract:

Er³⁺ doped potassium sodium niobate (KNN: Er) ultrafine powders have been prepared by pulsed laser ablation in water. X-ray diffraction (XRD) pattern of the sample demonstrated that the as-synthesized powders were crystalized in orthorhombic phase. Scanning electron microscopy (SEM) and transmittance electron microscopy (TEM) images exhibited that the morphology of ultrafine powders are cube-like. Under the excitation of 980 nm laser, the sample exhibits green emission, which is originated from the transition of thermal coupled energy levels (²H_11/2, ⁴S_3/2) to ground state level ⁴I_15/2. Temperature dependent up-conversion emission intensity associated with thermal quenching of total green emission band and the fluorescence intensity ratio (FIR) between two sub-emission bands related to population of thermal coupled energy levels are investigated for temperature sensing in the temperature range of 300 K to 480 K. The temperature sensing performances related to different technique were discussed. A maximum relative sensitivity reaches 1.01% K^-1 at 464 K for emission intensity thermometry and that is 0.84% K^-1 at 374 K for FIR thermometry technique. All these results show that KNN: Er ultrafine phosphors prepared via pulsed laser ablation in water have prospect for non-contact temperature sensing.

• Periodical: Materials Science Forum (Volume 998)
• Pages: 197-202
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.998.197
• Online since: June 2020
• Authors: Zhen Liu, Di Hu Chen*
• Keywords: Luminescence, Pulsed Laser Ablation, Temperature Sensing, Ultrafine Powders

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