The piezospectroscopic (PS) coefficients relating frequency shift to pressure are evaluated for Sm<sup>3+</sup> in the Al<sub>2</sub>O<sub>3</sub>-Y<sub>2</sub>O<sub>3</sub> system compounds, which include Al<sub>2</sub>O<sub>3</sub>, Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>, YAlO<sub>3</sub>, Y<sub>4</sub>Al<sub>2</sub>O<sub>9</sub>, and Y<sub>2</sub>O<sub>3</sub>. The fluorescence peaks are inherently narrow for all the synthesized compounds, on the basis of the f-f transition nature of Sm<sup>3+</sup> ion. Furthermore, the PS coefficients are ranged from -2.2 to -8.2 cm<sup>-1</sup>/GPa, which are similar to the reported value for the R1 line of ruby and suitable for the PS stress evaluation. PS stress distribution measurements are demonstrated with sintered Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub> ceramics as a sample, with 50 mu m intervals, under a microscope.

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