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The photoluminescence properties of 0.2% Pr3+-doped (Y1­0.01xZr0.01x)2O3, (x = 0, 0.1, 1, 3, 4.5, 6) ceramics were investigated. The luminescence intensity due to the transition from the P0 level increased drastically when the Zr content x increased, which is completely quenched in Y2O3:Pr (x = 0) due to the thermal relaxation through the lowest 5d level of the Pr3+ ion. By monitoring at 630 nm (D21⁄4H4), we found that the 4f­5d photoluminescence excitation bands for Pr3+ in the two six-fold sites [C2 and S6 in the Y2O3:Pr (x = 0)] were observed at approximately 300 and 340 nm. On the other hand, when monitored at 510 nm (P01⁄4H4), the Zr-doped samples showed an additional 4f­5d band at 280 nm. Based on these results, we concluded that the P0 luminescence is from Pr3+ in a seven-fold site, which is generated by incorporation of an additional oxygen via a defect chemical reaction, 2ZrO2 ! Y2O3 2Zr Y þO00 i þ 3OxO. ©2014 The Ceramic Society of Japan. All rights reserved.

Modulation of the optical properties of Pr<sup>3+</sup>-doped Y<sub>2</sub>O<sub>3</sub> ceramics by Zr doping