【作者】 赵方亮；

【导师】 杨志平；

【作者基本信息】 河北大学 ， 光学工程， 2009， 硕士

【摘要】 本文以适合近紫外LED激发的荧光材料为研究对象,采用高温固相法合成了几种很有应用前景的LED用荧光材料。利用X射线粉末衍射(XRD)探索了合成材料的晶体结构。通过改变激活剂和共激活剂的掺杂浓度,借助于激发谱、发射谱、光度计等手段对材料的发光性能进行了详细的研究。结果如下：合成了绿色荧光粉Sr3B2O6:Tb3+,Li+,分析了碱土金属离子Li+作为电荷补偿剂对样品发光性能的影响,发现加入电荷补偿剂可以很大程度提高样品的发光亮度。制备了新型的CaBa2(BO3)2:Eu2+绿色荧光粉,其激发主峰值位于400nm,与近紫外LED管芯(350-410nm)匹配；当Eu2+浓度为0.02时,发光性能最好,Eu2+含量较大时,Eu2+之间共振能量传递增强,发生浓度猝灭现象。合成了Ca2Si03Cl2:Eu3+,Li+红色荧光粉,其激发主峰值与近紫外管芯(350-410nm)匹配；分析了碱土金属离子Li+作为电荷补偿剂及Eu3+含量对样品发光性能的影响。研究了Eu2+,Mn2+共激活的单一基质Ca10(Si2O7)3Cl2白色发光材料的发光性质。Eu2+中心形成峰值分别为426nm,523nm的特征宽带,而Eu2+中心向Mn2+中心的能量传递导致了峰值为585nm的发射,三个谱带叠加从而在单一基质中得到了白光；其激发光谱分布在250—450nm的波长范围,可以被InGaN管芯产生的350—410nm辐射有效激发。更多还原

【Abstract】 In this paper, some kinds of phosphor used for near ultraviolet LED were fabricated by traditional high temperate solid stated method. Compare with Joint Committee on Powder Diffraction Standards, the crystal structure of the phosphors were studied. And the emission and excitation spectra of the phosphor were investigated, so that the luminescent properties of the phosphor can be explained. The chief contents are given as follows:The green phosphor Sr3B2O6:Tb3+,Li+ was prepared. The role of charge compensation of Li+ ions to the emission intensity was studied also. It was found that Li+ ions can enhance the intensity of the emissions well. A novel green-emitting phosphor CaBa2(BO3)2:Eu2+ was prepared. The excitation spectrum is a broad band and its main peak is at 400nm, which matches the emission of near ultraviolet light-emitting diodes (nUVLEDs). When the concentration of doped Eu2+ is 2%, the CaBa2(BO3)2:Eu2+ has the strongest emission intensity.The red phosphor Ca2SiO3Cl2:Eu3+, Li+ was fabricated by solid stated method. The excitation spectrum is coupled well with the emission of UVLEDs (350-410 nm). The effects of doped-Eu3+ concentration and charge compensations of Li+ on the emission intensity are also investigated. The luminescence properties of single white emitting phosphor Eu2+,Mn2+ co-activated Ca10(Si2O7)3Cl2 were studied. The emission peaks that located at 426 nm and 523 nm originated from the center of the Eu2+, while the 585 nm emission was attributed to the energy transfer from Eu2+ to Mn2+.White light could be obtained by mixing the three emission colors of blue (426nm), green (523 nm) and red (585 nm) in the single host. The excitation bands of the three emission colors were all extended from 250 nm to 450 nm. Phosphor can be excited effectively by InGaN chips in the range of 380-410 nm.更多还原