论文部分内容阅读
以强碱性阴离子交换树脂为沉淀剂,采用离子交换法制备了ZrO_2:Eu~(3+)纳米晶,通过XRD,TEM,HRTEM和EDS等对晶体的结构、形貌及化学成分进行了表征,利用3D荧光光谱、激发光谱和发射光谱研究了Eu~(3+)在ZrO_2纳米晶中的发光性质。结果表明,焙烧温度在800℃以下所得的ZrO_2:Eu~(3+)纳米晶主要为四方结构,晶粒尺寸约为5—20 nm,随着焙烧温度的升高,样品的晶结构发生了细微变化,从900℃开始出现了少量单斜晶,由ZrO_2:Eu~(3+)的3D荧光光谱确定了其最佳监测波长和发射波长,在394 nm波长光的激发下观察到纳米ZrO_2中Eu~(3+)的590 nm(~5D_0→~7F_1)和606 nm(~5D_0→~7F_2)特征发射谱,随着相结构细微的变化,发射光谱的形状及强度均发生变化,说明ZrO_2:Eu~(3+)纳米晶的发光性质对其结构非常敏感。
The ZrO_2: Eu ~ (3 +) nanocrystals were prepared by ion exchange method using strong basic anion exchange resin as precipitating agent. The structure, morphology and chemical composition of the crystals were characterized by XRD, TEM, HRTEM and EDS The luminescent properties of Eu ~ (3+) in ZrO_2 nanocrystals were investigated by 3D fluorescence, excitation and emission spectra. The results show that the ZrO_2: Eu ~ (3+) nanocrystals obtained at 800 ℃ have a tetragonal structure with a grain size of about 5-20 nm. With the increase of calcination temperature, the crystal structure of the sample A slight amount of monoclinic began to appear at 900 ℃. The optimal monitoring wavelength and emission wavelength were determined by 3D fluorescence spectra of ZrO_2: Eu ~ (3+). Under the excitation of 394 nm wavelength, the nanocrystalline ZrO_2 The characteristic emission spectra of 590 nm (~ 5D_0 → ~ 7F_1) and 606 nm (~ 5D_0 → ~ 7F_2) in Eu ~ (3+) show a change in the shape and intensity of the emission spectrum with the slight change of phase structure, The luminescent properties of ZrO_2: Eu ~ (3+) nanocrystals are very sensitive to their structure.