YAG:Dy and YAG:Tm Fluorescence Above 1400 C

Fluorescence from three samples of YAG:Tm, and three samples of YAG:Dy, with different activator concentrations, was measured for a wide temperature range, extending from room temperature to about 1700 C. Fluorescence lifetimes were measured for emissions at 460 nm from the YAG:Tm and at 453, 480, and 575 nm from YAG:Dy. The measurement system is described, including techniques for ac-commodating the high background blackbody radiation encountered at these very high temperatures. Data compilations are shown, including the fluorescence lifetimes over the temperature range of the measurement. This study has extended the high-temperature range of phosphor thermometry by ap-proximately 200 C and shown the feasibility of using phosphor materials for very high temperature non-contact thermometry, opening up further applications for engines, materials, high-temperature process-ing, and related areas