High temperature phosphor thermometry with YAG: Dy and LED excitation on flexible YSZ ceramic ribbons

The aim of the present work is to extend the temperature range of phosphor thermometry as a diagnostic tool using the protective properties of thin flexible ceramic strips of Yttrium Stabilized Zirconia (YSZ). Previous investigations demonstrated adequate optical transmission properties for thermometry between 90°C and 700°C using 405 nm diode laser excitation. Here, YAG:Dy was selected for extending the range of applications to a higher temperature, nearing 1200°C and monitoring the 4I15/2 → 6H15/2 transition at 456 nm. Temperature dependent luminescence was observed, utilizing light emitting diode (LED) excitation at 365 nm, from ambient to 1200°C with a strong temperature dependence at temperatures exceeding 900°C. Graphic abstract: [Figure not available: see fulltext.