摘要
采用固相法制备了绿色LiM(M=Ca,Sr,Ba)BO3∶Tb3+发光材料。测量结果显示材料均可被紫外(350～410nm)光激发,发射绿光。研究了Tb3+浓度对材料发射光谱的影响,结果显示,随Tb3+浓度的增大,发射光谱峰位未发生变化,但其强度呈现出先增大后减小的趋势,即:存在浓度猝灭效应。加入电荷补偿剂Li+,Na+和K+提高了LiM(M=Ca,Sr,Ba)BO3∶Tb3+材料的发射强度。
LiM（M=Ca,Sr,Ba）BO3∶Tb^3＋ phosphors were synthesized by solid state reaction. The starting materials CaCO3,SrCO3,BaCO3,H3BO3,Li2CO3,Na2CO3,K2CO3 and Tb4O7 （99.99% in mass） in appropriate stoichiometric ratio were mixed in the alumina crucible,then the mixed powders were calcined at 700 ℃ for 2 h,and LiCaBO3∶Tb^3＋,LiSrBO3∶Tb^3＋ and LiBaBO3∶Tb^3＋ phosphors were obtained. The emission and excitation spectra were measured by a Shimadzu RF-540 ultraviolet spectrophotometer. All the photoluminescence properties of these phosphors were measured at room temperature. The emission spectra of LiM（M=Ca,Sr,Ba）BO3∶Tb^3＋ phosphors show several bands,and the main emission peaks correspond to the ^5D4→^7F6（486,486,488 nm）,^5D4→^7F5（544,544,544 nm）,^5D4→^7F4（590,595,593 nm） and ^5D4→^7F3（620,620,616 nm） typical transitions of Tb^3＋,and the typical transitions of Tb^3＋ happens to split because of the effects of LiM（M=Ca,Sr,Ba）BO3 crystals field. The excitation spectra for the 544 nm green emission of LiM（M=Ca,Sr,Ba）BO3∶Tb^3＋ phosphors illuminate that these kinds of phosphors can be effectively excited by ultraviolet （350-410 nm） light,and emit green light,therefore,they are promising phosphors for white light emitting diodes. Effects of activation and charge compensation on the luminescence intensities of LiM（M=Ca,Sr,Ba）BO3∶Tb^3＋ phosphors were studied,and the results show that the intensities were obviously effected.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2009年第11期2914-2916,共3页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(10647123)
河北省自然科学基金项目(E2009000209)
河北省教育厅基金项目(2009313)
河北省科学技术发展基金项目(51215103b)
河北大学青年基金项目(2006Q06)资助
