Optical Temperature Sensor Capabilities of the Green Upconverted Luminescence of Er3+ in La3NbO7 Ceramic Powders Articles uri icon

publication date

  • April 2022

start page

  • 455

end page

  • 465


  • 4


  • 12

International Standard Serial Number (ISSN)

  • 2073-4352


  • We present a study of the Er3+ upconverted luminescence in erbium doped Lanthanum
    Niobium Oxide, La3NbO7, ceramic powder, prepared by solid state reaction. This study focuses
    on the analysis of the feasibility of this system as a temperature sensor. Efficient UC luminescence
    was observed under the 975 nm excitation showing intense green, red and NIR (850 nm) emission
    bands. The NIR luminescence centred at about 850 nm and lying on the first biological window is
    mainly insensitive to the temperature. In contrast, the upconverted green bands, associated with
    the (2H11/2,4S3/2) !4I15/2 transitions, showed a high sensibility to temperature. Their temperature
    dependence was studied from RT up to 525 K, paying special attention to the physiological range of
    temperature (303–318 K). The high thermal sensitivities obtained, in comparison with other Er3+ and
    Er3+-Yb3+ based optical temperature sensors in such ranges, suggest the potential application of this
    phosphor in thermal sensing, suitable for both biological systems and other industrial applications
    requiring higher temperatures.


  • Physics


  • fluorescence intensity ratio; optical temperature sensor; er3+; up-conversion luminescence; sensitivity