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首页> 外文会议>International Conference on "Multidimensional Role of Basic Science in Advanced Technology" >Photoluminescence Studies of 2LaPO_4:Dy(1.5) Eu (x)Phosphors
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Photoluminescence Studies of 2LaPO_4:Dy(1.5) Eu (x)Phosphors

机译：2LAPO_4：DY（1.5％）EU（X）磷光体的光致发光研究

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摘要

The rare earth co-dopants of Dy(1.5 mol%) and Eu(0.2,0.5,1.0,1.5 and 2.0 mol%) doped in the host material of 2LaPO_4 and this phosphor is synthesized by solid state reaction method. The excitation spectra of synthesized phosphor at 595nmmonitoring were composed of a broadband and a series of sharp peaks, the strongest excitation peak at 254nm, 266nm and 395nm.The main emission spectra of samples under 254nm excitation is Eu~(3+) ions ~5D_0→~7F_2 electric dipole transition with a strong red light, so that the phosphors may be a better candidate for red component for white light generation in display and lamps. Powder samples were prepared by firing stoichiometric mixtures of starting materialsLa_2O_3 and 2NH_4H_2PO_4 as raw material and activators as Dy_2O_3 and Eu_2O_3 at 1200 °C for 2 hours. The photoluminescence spectra were obtained by using a spectrofluorophotometer with an 80-W Xe lamp and 0.25-m monochromators. Slit widths were 0.05 mm for emission and 1.56 mm for excitation. The emission spectrum of Eu~(3+) site in 2LaPO_4 shows maximum intensity at 490 nm to 617nm corresponding to ~5D_0→~7F_2 transition, and the transition of ~5D_0→~7F_1 around 595nm is observed with high intensity in this phosphor. Both excitation bands correspond to the [Eu~(3+) -O~(2-)] charge-transfer transitions. It is known that the position of the [Eu~(3+) - O~(2-)] charge transfer transition is more or less fixed in octahedral VI coordination but moves to lower energy with increasing Eu-O distance.
机译：通过固态反应方法合成掺杂在2LAPO_4的主体材料中的Dy（1.5mol％）和欧盟（0.2,0.5,1.0,1.5和2.0mol％）的稀土共掺杂剂，并通过固态反应方法合成。 595nmmonitoring的合成磷光体的激发光谱由宽带和一系列尖峰组成，最强的激发峰值为254nm，266nm和395nm。254nm激发下的样品的主要发射光谱是Eu〜（3+）离子〜5d_0 →〜7F_2电偶极电动偶极过渡具有强烈的红光，使磷光体可能是显示器和灯中的白光发电的更好的红色部件候选者。通过将原料La_2O_3和2NH_4H_2PO_4作为原料的化学计量混合物作为原料和活化剂在1200℃下以DY_2O_3和EU_2O_3燃烧2小时来制备粉末样品。通过使用具有80-W XE灯和0.25m单色剂的光谱荧光仪获得光致发光光谱。狭缝宽度为0.05 mm，供发射和1.56毫米的激发。 2LAPO_4中Eu〜（3+）位点的发射光谱显示在490nm至617nm的最大强度，对应于〜5d_0→〜7f_2转变，并且在该磷光体中具有高强度〜5d_0→〜7f_1的过渡。两个激励带对应于[EU〜（3+）-O〜（2-）]电荷转移转换。已知[Eu〜（3+） - O〜（2-）]电荷转移转移的位置或多或少固定在八面体VI的协调中，但随着EU-O距离的增加而导致降低能量。

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