Laser induced phosphorescence (LIP) thermometry can provide spatially and temporally resolved temperature fields in harsh environment like gas turbine combustors with high-accuracy and a relatively simple setup. For measurement in gas turbine combustor, the employed thermographic phosphor (TP) should have high sensitivity and signal yield at high temperatures. It is known that phosphor composition, crystallinty, and morpholgy can affect the TP phosphorescence properties. Four high-temperature phosphors with different composition were prepared with sol-gel synthesis (SGS) here, viz. YAG:Dy, YAG:Dy:Er, YABNG:Dy, and YABG:Dy. The phosphor crystallinity and morphology were determined by x-ray diffraction spectroscopy (XRD) and scanning electron microscopy (SEM), respectively. The phosphor emissions were measured with a setup consisted of a UV laser, high temperature oven, and spectrometer. The integral of YABNG:Dy emission was 1.5 to 2 times higher than other investigated phosphors at temperatures above 1200 K. The increment in emission intensity improved the precision at high temperatures.M.A.S
