abstract
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 (H-2(11/2),S-4(3/2)) -> I-4(15/2) 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.
keywords
CONVERSION LUMINESCENCE; INTENSITY RATIO; SPECTROSCOPIC PROPERTIES; THERMAL SENSITIVITY; TM3+ IONS; FLUORESCENCE; EMISSION; PHOSPHORS; THERMOMETRY; STOKES
subject category
Crystallography; Materials Science
authors
Hernandez-Rodriguez, MA; Egana, A; Rodriguez-Mendoza, UR; Lavin, V; Munoz-Santiuste, JE
our authors
Miguel Andrés Hernández Rodríguez
Junior Researcheracknowledgements
This research has been partially supported by the Spanish Ministerio de Ciencia, Innovacion y Universidades (MICINN) through the Spanish projects RTI2018-101020-B-100 and PID2019-106383GB-C44, by the Madrid Government (Comunidad de Madrid-Spain) under the Multiannual Agreement with UC3M in the line of Excellence of University Professors (EPUC3MXX) and in the context of the V PRICIT (Regional Programme of Research and Technological Innovation) by the Agencia Canaria de Investigacion, Innovacion y Sociedad de la Informacion (ACIISI) (ProID2017010078).