Eu^(2+)在Sr_2SiO_4·SrCl_2材料中的发光特性  

Luminescent properties of Eu^(2+) in Sr_2SiO_4·SrCl_2 phosphor

作　　者：王志军[1] 李盼来[1] 杨志平[1] 郭庆林[1] 

机构地区：[1]河北大学物理科学与技术学院,河北保定071002

出　　处：《功能材料》2012年第B11期314-317,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50902042);河北省自然科学基金资助项目(E2009000209;E2010000283);河北省教育厅基金资助项目(2009313);发光与光信息技术教育部重点实验室研究基金资助项目(2010LOI12)

摘　　要：采用高温固相法制备了Sr2SiO4.SrCl2∶Eu2+荧光粉,并研究了材料的发光特性。X射线衍射结果显示,Sr2SiO4.SrCl2∶Eu2+材料是由SrCl2∶Eu2+和Sr2SiO4∶Eu2+构成的复合化合物。以320nm紫外光作为激发源,测得材料的发射光谱呈宽谱特征,覆盖350～600nm。在0.5%～2%范围增大Eu2+掺杂量时,位于蓝色光区域的发射峰位置没有变化,为403nm,处于长波方向的发射峰呈现出先红移、后蓝移的变化趋势,但两发射峰的强度均明显减小。监测两发射峰,所得结果分别对应SrCl2∶Eu2+和Sr2SiO4∶Eu2+材料的激发光谱,覆盖250～400nm。分析认为,材料的光谱分布及发射强度的变化与晶场环境及处于不同Sr2+格位上Eu2+间的能量传递等有关。Sr2SiO4 ·SrCl2 ： Eu^2＋ was synthesized by a high temperature solid-state method. SrCOa, SrCl2, SlOe and Eu2O3 are used for starting materials. The phase present of the samples was characterized by powder X-ray diffraction （XRD） （D/max-rA, Cu K or, 40kV, 40mA, λ =0. 15406nm）. The luminescent properties of phos- phors are measured by a SHIMADZU RF-540 fluorescence spectrophotometer. Sr2SiO4 · SrC12 ： Eu^2＋ shows a broad emission band in the region of 350-600nm. With increasing the Euz＋ doped content （0.5%-2%）, the blue emission peak still locates at 403nm, however, the long wavelength emission peak firstly occurs to red shift, then blue shift. Moreover, the intensity of the two emission peaks gradually decreases. Montoired at the two emission peaks, the excitation spectra both show broad emission band in the region of 250-400nm, which correspond to that of SrC12 ： Eu^2＋ and Sr2SiO4 ： Eu^2＋ phosphors, respectively. In our opinion, the spectral distributing and the emission intensity are influenced by the crystallographic and the energy transfer from one Eu^2＋ to anohter.

关 键 词：发光 Eu2+ Sr2SiO4.SrCl2 

分 类 号：O614[理学—无机化学] O482.31[理学—化学]