Zhai Yong-Qing, Yang Guo-Zhong, Liu Yu, Liu Hong-Mei
College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2008 Mar;28(3):522-6.
A novel red-emitting phosphor SrO . Y2O3 : Eu was synthesized by glycine combustion process. The phases and structure, the size and morphology, and the luminescent properties of the samples were investigated respectively by XRD, SEM and fluorescence spectrophotometer (FL). The results show that the samples include two phases, SrY2O4 and Y2O3, which belong to orthorhombic system and cubic system respectively. The particles of SrO . Y2O3 : Eu obtained at 1 200 degrees C are nearly spherical in shape, and the mean grain size is in the range of 100-200 nm. The excitation spectrum of SrO . Y2O3 : Eu phosphor shows a broad band with a main peak around 280 nm, which is due to the charge-transfer (CT) in the excitation of an electrons from the oxygen 2p state to an Eu3+ 4f state. Excited with a radiation of 280 nm, the phosphor emits strong red fluorescence, and the main emission peak is around 592 nm, which can be assigned to the transition of 5D0 -->7 F1 of Eu3+ ion. Another strong emission peak is at 614 nm, which can be assigned to the transition of 5D0 --> 7 F2 Of Eu3+ ion. Moreover, it was found that the ratio of glycine to nitrate ion, calcinations temperature and the concentration of Eu3+ have significant effect on the luminescent intensity of SrO . Y2O3 : Eu.
采用甘氨酸燃烧法合成了一种新型红色发光荧光粉SrO·Y₂O₃:Eu。分别通过X射线衍射仪（XRD）、扫描电子显微镜（SEM）和荧光分光光度计（FL）对样品的相结构、尺寸形貌及发光性能进行了研究。结果表明，样品包含SrY₂O₄和Y₂O₃两个相，分别属于正交晶系和立方晶系。1200℃下制备的SrO·Y₂O₃:Eu颗粒近似球形，平均粒径在100 - 200nm范围内。SrO·Y₂O₃:Eu荧光粉的激发光谱呈现一个宽带，主峰位于280nm左右，这是由于电子从氧的2p态激发到Eu³⁺的4f态时发生的电荷转移（CT）。用280nm的辐射激发时，该荧光粉发出强烈的红色荧光，主发射峰位于592nm左右，可归属于Eu³⁺离子的⁵D₀→⁷F₁跃迁。另一个强发射峰位于614nm，可归属于Eu³⁺离子的⁵D₀→⁷F₂跃迁。此外，发现甘氨酸与硝酸根离子的比例、煅烧温度以及Eu³⁺的浓度对SrO·Y₂O₃:Eu的发光强度有显著影响。
