Custom-built thermometry apparatus and luminescence intensity ratio thermometry of ZrO2:Eu3+ and Nb2O5:Eu3+

摘要

A complete apparatus for luminescence thermometry has been built comprising a programmable hot-plate up to 400 degrees C, a hot/cold plate 0 degrees C-80 degrees C, a control circuit with thermocouple feedback, a platinum resistance thermometer and an oven for calibration. An original design allowed us to build the apparatus for under 100 $, considerably less than for the commercial equipment. The apparatus must be used with an optical fiber bundle attached to a spectrofluorometer. It is tested for stability and on ZrO2:Eu3+ and Nb2O5:Eu3+ samples prepared by a plasma electrolytic process. The tests showed the high stability of the temperature-controlled surfaces. The thermometric properties of the investigated material were tested by the luminescence intensity ratio method of D-5(1) - F-7(1) and D-5(0) - F-7(2) transitions. The calculated relative sensitivities of Nb2O5:Eu3+ and ZrO2:Eu3+ are 3.17% K-1 and 3.07% K-1 at 290 K, respectively, and 0.0012 K-1 at 453 K and 0.00012 K-1 at 445 K are the calculated absolute sensitivity values, respectively. Nb2O5:Eu3+ has shown good thermometric properties up to 180 degrees C, while ZrO2:Eu3+ is a promising temperature sensor phosphor for higher temperature measurements.