The characteristics of photoluminescence of Cr3+ in the thermally grown oxide (TGO) layer in thermal barrier coating (TBC) for gas turbine blades was evaluated. A pulsed Nd:YAG laser of wavelength 532nm was used to excite Cr3+ in the TGO layer in TBC specimens, and the luminescence was detected at 694nm. Photoluminescence of Cr3+ was observed for TBC specimens heated for 100 hrs and 1000 hrs at 1100°C, but was not observed for the specimen without heating. The intensity of photoluminescence of Cr3+ for the heated specimens showed two radiative lifetimes, which are thought to be the radiative lifetimes of Cr3+ in different metal oxides, possibly Al2O3 and AlYO3. Effects of self-absorption were not observed. In addition, the photoluminescence intensity was proportional to the excitation intensity, showing that the effects of saturation were absent.
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