Ca_2SiO_3Cl_2∶Eu^(3+)材料的发光特性  

Luminescent characteristics of Ca_2SiO_3Cl_2∶Eu^(3+) phosphor

作　　者：李盼来[1] 吴君楠[2] 王志军[1] 杨志平[1] 李旭[1] 杨艳民[1] 

机构地区：[1]河北大学物理科学与技术学院,河北保定071002 [2]河北工业大学机械学院,天津300000

出　　处：《功能材料》2010年第6期1068-1070,共3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)

摘　　要：采用高温固相法合成了Ca2SiO3Cl2∶Eu3+红色发光材料。利用X射线分析了材料的晶体结构,其为四方晶系;在400nm近紫外光激发下,材料呈红色发射,主发射峰位于582、599、623、655和691nm,分别对应Eu3+的5D0→7F0、7F1、7F2、7F3和7F4特征跃迁;监测599nm最强发射峰,激发光谱覆盖200～450nm,主激发峰位于400nm。研究了Eu3+摩尔浓度对Ca2SiO3Cl2∶Eu3+材料发射强度的影响,结果显示,随Eu3+浓度的增大,强度先增大、后减小,Eu3+浓度为1%时,强度最大。引入Li+后,材料的发射强度进一步增大。Ca2SiO3Cl2∶Eu^3＋ phosphor was synthesized by high temperature solid state reaction.CaCO3（A.R.）,SiO2（A.R.）,NH4Cl（A.R.）,Li2CO3（A.R.） and Eu2O3（99.99%） were used for starting materials.After these individual materials were blended and grounded thoroughly in an agate mortar,the homogeneous mixture was heated at 850℃ for 3 h,and the phosphor was obtained.The phase present of the samples was characterized by powder X-ray diffraction（XRD）（D/max-rA,Cu Kα,40kV,40mA,λ=0.15406nm）.The excitation and emission spectra of these phosphors were measured by a SHIMADZU RF-540 fluorescence spectrophotometer.The phosphor shows five major emission peaks locating at 582,599,623,655 and 691nm,which correspond to the ^5D0→^7F0,^7F1,^7F2,7F3 and 7F4 characteristics transport of Eu^3＋,respectively.The influence of the concentration of Eu3＋ ions to the emission intensity was investigated.Firstly,the intensities increase with increasing Eu3＋ concentration,then,decrease because of concentration quenching.It reaches the maximum content of 1% Eu3^＋,and the concentration self-quenching is the dipole-dipole interaction based on the dexter theory.The emission intensity of Ca2SiO3Cl2∶Eu^3＋ phosphor was enhanced by doping Li^＋.The results show that Ca2SiO3Cl2∶Eu^3＋ phosphor is a promising red phosphor for white light emitting diode（w-LED） based on UV InGaN chip.

关 键 词：白光LED Ca2SiO3Cl2∶Eu^3+ 发光特性 

分 类 号：O644[理学—物理化学] O482.31[理学—化学]