Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi Kohoku-ku, Yokohama-shi, Kanagawa, Japan.
Luminescence. 2011 Nov-Dec;26(6):381-9. doi: 10.1002/bio.1237. Epub 2010 Aug 25.
The temperature-dependent photoluminescences of Y(2)O(3) : Eu (6% Eu), Y(2)O(3) : Tb (4% Tb) and Y(2)O(3) : Tm (1% Tm) were investigated for high-temperature phosphor thermometry. Two different phases, the monoclinic phase and cubic phase, were considered because the fluorescence spectra vary with the phase. To employ the intensity ratio method, we investigated their photoluminescence spectra under the excitation light of an Hg-Xe lamp as the temperature was elevated from room temperature to more than 1200 K. As a result, it was confirmed that the luminescence intensity of all of the phosphors varied with elevating temperature, i.e. thermal quenching, with the variations depending on the type of rare earth impurity and their phases. The results indicate that Y(2)O(3) : Eu phosphors are applicable to the intensity ratio method because they show appropriate variations in the intensity ratio of two emission lines, and they also have strong and sharp peak intensities without excessive optical noise or black body radiation over a wide range of temperatures. The intensity ratios for Y(2)O(3) : Tb provide such small variations with temperature that the temperature resolution is low, despite the strong emission intensities. As for Y(2) O(3) :Tm, the intensity ratios also have a low temperature resolution and their emission intensities are weak. Therefore, Y(2)O(3) : Tb and Y(2)O(3) : Tm are not appropriate for the intensity ratio method for phosphor thermometry.
研究了 Y(2)O(3)：Eu(6%Eu)、Y(2)O(3)：Tb(4%Tb)和 Y(2)O(3)：Tm(1%Tm)在高温磷光体测温中的温度依赖光致发光。由于荧光光谱随相变化而变化，因此考虑了两种不同的相，即单斜相和立方相。为了采用强度比法，我们在汞氙灯激发光下研究了它们的光致发光光谱，温度从室温升高到 1200 K 以上。结果证实，所有荧光粉的发光强度都随温度升高而变化，即热猝灭，其变化取决于稀土杂质的类型及其相。结果表明，Y(2)O(3)：Eu 荧光粉适用于强度比法，因为它们在两个发射线的强度比上表现出适当的变化，并且在很宽的温度范围内具有强而尖锐的峰值强度，没有过度的光学噪声或黑体辐射。Y(2)O(3)：Tb 的强度比随温度变化很小，因此温度分辨率较低，尽管发射强度很强。对于 Y(2)O(3)：Tm，强度比的温度分辨率也较低，其发射强度较弱。因此，Y(2)O(3)：Tb 和 Y(2)O(3)：Tm 不适合用于磷光体测温的强度比法。
