白光LED用Ba_3SiO_4Cl_2∶Eu^(2+)材料的光谱特性  

Spectral Characteristics of Ba_3SiO_4Cl_2∶Eu^(2+) Phosphor for White LED

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：《光谱学与光谱分析》2013年第2期486-489,共4页Spectroscopy and Spectral Analysis

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

摘　　要：采用高温固相法合成了Ba3SiO4Cl2∶Eu2+蓝绿色荧光粉,并测量了材料的光谱特性等。研究结果显示,在365nm近紫外光激发下,Ba3SiO4Cl2∶Eu2+材料呈双峰宽带发射,主发射峰分别为445和510nm;分别监测这两个发射峰,所得激发光谱覆盖范围为250～450nm,主激发峰分别为350和400nm,但光谱分布不同,说明两发射峰来源于不同的Eu2+发光中心。研究了Eu2+掺杂浓度对材料光谱性能的影响,发现随Eu2+掺杂量的增大,445nm发射峰的强度增加,而510nm发射峰的强度减弱。采用去离子水清洗Ba3SiO4Cl2∶Eu2+材料后,445nm发射峰消失,只保留了510nm发射峰,且发射峰的强度明显减弱。Ba3SiO4Cl2：Eu^2＋ was synthesized by a high temperature solid state method. BaCO3 （A. R. ）, BaClz （A. R. ）, SiO2 （99.99%） and Eu2O3 （99.99%） were used as the raw materials. The final phase was checked with a conventional X-ray diffrac-tion （XRD） （D/max-rA, CuKa, 40 kV, 100 mA, λ=0. 154 06 nm）. The spectral characteristics of the phosphors were per-formed by using a Hitachi F-4600 fluorescence spectrophotometer equipped with a 450 W Xe lamp. Ba3SiO4Cl2：Eu^2＋ showed broad emission bands at 445 and 510 nm under the 365 nm radiation excitation. For the two emission peaks, the excitation spec-tra have two different spectral distributions, and the excitation peaks locate at 350 and 400 nm, respectively. The results indicate that different Eu^2＋ emission centres exist in Ba3SiO4Cl2. The emission intensity of the 445 and 510 nm peaks is influenced by Eu^2＋ doped content. With increasing its content, the emission intensity of 445 nm gradually increases, and that of 510 nm de- creases. With washing the phosphor, the 445 nm emission peak disappears, and the emission spectrum has only the 510 nm emission band, and its intensity is lower than that of the original phosphor.

关 键 词：白光LED Ba3SiO4Cl2∶Eu2+ 光谱特性 

分 类 号：O482.3[理学—固体物理]