화학공학소재연구정보센터
Journal of the American Ceramic Society, Vol.102, No.10, 6018-6026, 2019
Reversible luminescence modulation and temperature-sensing properties of Pr3+/Yb3+ codoped K0.5Na0.5NbO3 ceramics
In this work, we have prepared a novel (K0.5Na0.5)(0.99-x)PrxYb0.01NbO3 (abbreviated as KNN:xPr(3+)/0.01Yb(3+), x = 0.0006, 0.0008, 0.001, 0.002, 0.003, and 0.004) ceramics, which possess visible UC emissions, photochromic (PC) and optical thermometric properties. Under the excitation of a 980-nm diode laser, all the samples show the featured emissions of Pr3+ ions and the UC emission intensity is greatly dependent on the Pr3+ doping content. The optimal UC luminescence intensity is obtained at x = 0.001. All the prepared samples show a strong PC reaction, and a large luminescence quenching degree (Delta R-t) of 74.94% is found. The optical thermometric properties of both the irradiated and unirradiated KNN:0.001Pr(3+)/0.01Yb(3+) ceramics in the temperature range of 123-573 K have been investigated via measuring the temperature-dependent UC emission spectra of green emissions, which originate from the two P-3(1) and P-3(0) thermally coupled levels. It has been found that the prepared samples have both excellent PC behaviors and temperature-sensing performances. These results suggest that the KNN:xPr(3+)/0.01Yb(3+) ceramics are promising candidates for the applications in PC reaction and thermometers.