【作者】 杨广伟；

【导师】 杨志平；

【作者基本信息】 河北大学 ， 光学工程， 2008， 硕士

【摘要】 本文采用高温固相法合成了几种以磷酸盐为基质适合UVLED激发的荧光材料。对所合成材料进行了XRD物相分析,并对其激发光谱和发射光谱进行了研究,解释了所合成荧光材料的发光性质与原理。主要内容如下：(1)合成了BaZnP2O7:Eu3+橙红色荧光粉,分析了碱土金属离子Li+、Na+和Cl-作为电荷补偿剂及Eu3+含量对样品发光性能的影响。(2)合成了NaCaPO4:Eu2+绿色荧光粉,其激发主峰值位于400nm,与UVLED管芯(350-410nm)匹配。考察了Eu2+含量对样品发光性能的影响。(3)合成了NaCaPO4:Tb3+绿色荧光粉,其激发主峰值与UVLED管芯匹配。分析了碱土金属离子Li+、Na+和K+作为电荷补偿剂及Tb3+含量对样品发光性能的影响。(4)研究了Eu2+和Mn2+共掺杂的BaZnP2O7的光谱特性,随Mn2+浓度的增加,Eu2+的发射峰强度减小而Mn2+的发射峰强度增强,表明在BaZnP2O7:Eu2+,Mn2+中Eu2+对Mn2+的发光有明显的敏化作用。根据Dexter电多极相互作用的能量传递几率公式判断出Eu2+对Mn2+的能量传递属于电偶极-电四极相互作用引起的共振能量传递。更多还原

【Abstract】 In this paper, some kinds of phosphate phosphor used for UVLED were fabricated by traditional high temperate solid stated method. Compared with Joint Committee on Powder Diffraction Standards, the crystal structure of the phosphors were studied. The emission and excitation spectra of the phosphor were investigated, and the luminescent mechanism of the phosphors were analysed. The chief contents are given as follows:(1) The BaZnP2O7:Eu3+phosphor was prepared. The role of charge compensation of Li+, Na+ and Cl- and doped-Eu3+ concentration to the emission intensity was studied.(2) A novel green-emitting phosphor NaCaPO4:Eu2+ was prepared. The excitation spectrum is a broad band extending from 250 to 450 rm, which matches the emission of UVLED(350-410 nm). The effect of doped Eu2+ concentration on the emission intensity was also investigated.(3) The NaCaPO4:Tb3+ phosphor was prepared. The excitation spectrum contains a broad band extending from 350 to 400 nm, which is coupled well with the emission of UVLED. The effects of doped-Tb3+ concentration and charge compensations of Li+, Na+ and K+ on the emission intensity are also investigated.(4)The spectra characteristic of BaZnP2O7:Eu2+, Mn2+ was studied. With the increasing Mn2+ dopant content, the intensity of Eu2+ was observed to decrease, but the intensity of Mn2+ was simultaneously found to increase. It is suggested that Mn2+ ion is sensitized by Eu2+ ion. According to the Dexter’s energy transfer formula of multipolar interaction, we have demonstrated that the energy transfer between Eu2+ and Mn2+ is due to the electric dipole-quadripole interaction of the resonance transfer.更多还原