稀土Dy~(3+)掺杂YAG发光材料的制备及其变温发光特性研究

采用溶胶-凝胶法与燃烧法相结合制备了YAG:Dy~(3+)粉体,研究了不同Dy~(3+)掺杂浓度对YAG:Dy~(3+)晶体结构和发光特性的影响。XRD结果表明,YAG:3%Dy~(3+)和YAG:4%Dy~(3+)样品均保持了基质YAG的晶相结构。在365nm光激发下,常温下两种掺杂浓度样品的光致发光峰主要集中在可见光区范围,其中掺杂浓度为4%的样品的发光强度要高于浓度为3%的样品。YAG:4%Dy~(3+)样品变温光致发光特性结果表明,在373K~773K温度范围内,发射峰的峰位没发生变化,由于热淬灭效应,573nm和478nm的发光峰的发光强度随温度升高而整体降低,而455nm处的发光峰强度随温度升高而整体升高。计算了455nm和478nm两个发光峰的荧光强度比,并将其与温度关系进行了拟合,得到了Dy~(3+)离子的热耦合能级~4I_(15/2)→~6H_(15/2)和~4F_(9/2)→~6H_(15/2)的有效能级差ΔE为670cm~(-1)。YAG:4%Dy~(3+)的测温绝对灵敏度在373K达到最大值0.00694K~(-1)。

Preparation and Luminous Capability of Rare Earth Dy3+Doped YAG Phosphors

YAG:Dy3+powders were prepared by the combination of sol-gel method and combustion method,The ef-fects of different Dy3+doping concentration on the crystal structure and luminescence properties of YAG:Dy3+were in-vestigate. The results of XRD show that the crystal phase structure of the matrix YAG was maintained by both YAG:3%Dy3+and YAG:4%Dy3+samples. Under the excitation of 365nm light,the photoluminescence peaks of two doped samples at normal temperature are mainly concentrated in the range of visible light,The luminescent spectra is mainly concentrated in the range of visible light,the luminescence intensity of the sample with a concentration of 4% is higher than that of the sample with a concentration of 3%.The photoluminescence of AG:4%Dy3+samples showed that the peak position of the emission peak did not change in the range of 373K~773K temperature,because of the heat quenching effect,the luminescence intensity of 573nm and 478nm luminescence decreases with the increase of tempera-ture,while the emission intensity of 455nm increases with the increase of temperature. The fluorescence intensity ratio of two luminescent peaks of 455nm and 478nm was calculated,and the relationship between the fluorescence intensity ratio and the temperature was fitted,The thermal coupling energy levels of Dy3+ions 4I15/2→6H15/2and 4F9/2→6H15/2are obtained by fitting,and the effective energy differential ΔE is 670cm-1. The absolute sensitivity of YAG:4%Dy3+has the maximum value of 0.00694K-1at 373K.