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在微波场作用下快速合成了蓝色发光材料Sr_2Al_6O_(11):Eu~(2+)。由X射线衍射分析样品的晶相,扫描电镜观测晶体形貌。结果表明:产品为正交晶系,Pnnm空间群,a=2.191 827nm,b=0.840 857nm,c=0.488 175nm。产物主要为直径为200nm左右,长度约在1～2mm的棒状晶体,其间混有少量球状晶体。激发和发射谱均为宽带谱,主发射峰位于462nm处附近,半高宽为64nm,Eu~(2+)在Sr_2Al_6O_(11)基质中存在2个发光中心,经Gaussian曲线拟合,其2个分量分别位于456.7nm和483.4 nm处,与高温固相反应法合成的样品相比,这两个峰发生蓝移。随Eu~(2+)掺量的增大,2个发光中心的发光强度同时先增强后减弱,Eu~(2+)的掺量为0.1 mol时发光最强。
The blue luminescent material Sr 2 Al 6 O 11: Eu 2+ was rapidly synthesized under microwave irradiation. The crystal phase of the sample was analyzed by X-ray diffraction and the crystal morphology was observed with a scanning electron microscope. The results show that the product is orthorhombic, Pnnm space group, a = 2.191 827nm, b = 0.840 857nm, c = 0.488 175nm. The main products for the diameter of about 200nm, length of about 1 ~ 2mm rod-shaped crystals, mixed with a small amount of spherical crystals. Excitation and emission spectrum are broad band spectrum, the main emission peak is located near 462nm, the full width at half maximum is 64nm, Eu 2+ has two luminescent centers in Sr_2Al_6O_ (11) matrix, and Gaussian curve fitting, 2 The components are located at 456.7nm and 483.4nm, respectively, which are blue-shifted compared with those synthesized by high-temperature solid-state reaction. With the increase of the content of Eu 2+, the luminescence intensity of the two luminescent centers firstly increases and then decreases, and the luminescence intensity is the strongest when the Eu 2+ content is 0.1 mol.