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The high temperature sensitivity of the luminescence emission of thermographic phosphor (TP) particles favours its utilization for the measurement of wall or gas temperatures in combustion devices. The present work focuses on the luminescence behavior and suitability of two lanthanide ion types (Tm and Dy) doped in a YAG host crystal for high temperature applications. The Dy:YAG is a well-known thermographic phosphor and is used here as a reference for the comparison with Tm:YAG TP. Additionally its dopant concentration is varied to improve its signal intensity for high temperature applications. For the studied thermographic phosphors phosphorescence spectra, intensity ratios and luminescence decay time are characterized for a wide temperature range up to 1573 K.

Luminescence Properties of the Thermographic Phosphors Dy 3+ :YAG and Tm 3+ :YAG for the Application in High Temperature Systems