利用碱金属碳酸盐提高空气中制备BaMgSiO_4∶Eu^(2+)的发光性能研究

通过高温固相反应在空气中制备了一系列Eu2+掺杂的BaMgSiO4∶Eu2+发光材料,研究了其发光性能及M2CO3(M=Li、Na、K)助溶剂对其性能的影响。利用X射线粉末衍射(XRD)、荧光光谱(PL)和扫描电镜(SEM)对合成的样品进行表征。研究表明,Eu2+进入Ba(1)和Ba(2)位置有利于Eu2+在空气中稳定存在。M2CO3(M=Li、Na、K)助溶剂促进Eu3+离子在空气中还原成Eu2+离子,提高了BaMgSiO4∶Eu2+的发光强度。当Na2CO3用量为6%时,BaMg-SiO4∶Eu2+的发光强度达到还原气氛中制备的91%。

Eu^(2+)在新型基质Ca_8Mg(SiO_4)_4Cl_2中的光致发光

用CaCO_3(A.R.),SiO_2(_4N),Mg(NO_3)_2·6H_2O(A.R.),CaCl_2(A.R.)和Eu_2O_3(_4N)为原料,经高温固相反应,得到了新荧光体Ca_(4-x)Mg(SiO_4)_4Cl_2:Eu_x^(2+).对该荧光体的晶体结构和荧光光谱进行分析发现:该荧光体可能为单中心发光,Eu^(2+)主要占据对称性为C_2的Ca~Ⅱ格位.

Al^(3+)/Eu^(2+)共掺杂高硅氧玻璃的荧光特性

由纳米多孔玻璃制备了Al3+/Eu2+共掺杂的高硅氧玻璃,并研究了在纳米多孔玻璃基质中共掺杂Al3+离子对Eu2+离子450nm处蓝色荧光强度和荧光峰位的影响。结果表明,共掺杂Al3+离子可分散多孔玻璃中丛聚的Eu2+离子,加之Al2O3较低的声子能量,使Eu2+离子的蓝色荧光发射显著增强;并且由于共掺杂的Al3+降低了Eu2+离子5d轨道劈裂幅度,随着Al3+离子含量的增加,Eu2+离子荧光峰蓝移。

Photoluminescence properties of a blue-emitting phosphor Eu^(2+)-activated Ca_3ZnAl_4O_(10)

A new aluminate host material Ca3ZnAl4O10 doped with Eu2+ was prepared by a high-temperature solid-state reaction method, and a pure crystalline phase of Ca3ZnAl4O10 was confirmed with X-ray powder diffraction (XRD) measurement. The luminescent property was investigated with excitation and emission spectra. The phosphor could be excited by UV light from 220 nm to 400 nm and emitted a blue luminescence peaked at 450 nm, which corresponded to the 4f65d1→4f7 transition of Eu2+ ions. The dependence of luminesce...