锂离子掺杂对Na_2CaSiO_4:Eu~(3+)红色荧光粉能量增强作用研究
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摘要
为了提高Na_2CaSiO_4:Eu~(3+)荧光粉的发光强度,采用高温固相法合成系列Eu~(3+)、Li~+掺杂Na_2CaSiO_4红色荧光粉。通过X射线粉末衍射和荧光分析,研究荧光粉的结构和发光性能。考察了Eu~(3+)、Li~+掺杂浓度对荧光粉发光性能的影响。结果表明,掺杂了Eu~(3+)、Li~+后Na_2CaSiO_4仍为立方晶系结构,但掺杂后晶胞参数发生了变化,说明Eu~(3+)、Li~+已经进入晶格中。根据离子电负性标度,Li~+(1.009)与Na~+(1.024)电负性相近,Eu~(3+)(1.433)与Ca~(2+)(1.160)电负性相近,掺杂Li~+会优先取代Na~+,Eu~(3+)会优先取代Ca~(2+)。荧光粉随Eu~(3+)、Li~+掺杂浓度的增加,发光强度逐渐增大。当Eu~(3+)掺杂量为0.16时,荧光粉Na_2CaSiO_4:Eu~(3+)的发光达到最大值。Li~+的掺杂对Na_2CaSiO_4:Eu~(3+)荧光粉具有增敏作用。当Li~+掺杂量为0.12时,发射光的强度是掺杂前的1.61倍。
In order to enhance the luminous intensity of Na_2CaSiO_4:Eu~(3+),a series of Eu~(3+),Li~+ doped Na_2CaSiO_4 red phosphor were synthesized by high temperature solid method.The structure and luminescence properties of fluorescent power were studied by X-ray powder diffraction and fluorescent analysis.The effect of doping Eu~(3+) and Li~+ concentration on the luminescence performance of fluorescent power were investigated.The results showed that doping Eu~(3+) and Li~+ on the Na_2CaSiO_4 was still a cubic crystal structure,but the cell parameters were changed after doping indicating that Eu~(3+) and Li~+ had entered the lattice.According to ionic electronegativity,the values of Li~+(1.009) and Na~+(1.024) were similar,the values of Eu~(3+)(1.433)and Ca~(2+)(1.160) were similar,leading to their places of Na~+ by Li~+ and Ca~(2+) by Eu~(3+).With the increase of the concentration of Eu~(3+) and Li+doping, the luminescence intensity gradually increased.When the Eu~(3+) doping content is 0.16,the luminescence of fluorescent power Na_2CaSiO_4:Eu~(3+) reached the maximum value.The doping Li~+ could sensitize the Na_2CaSiO_4:Eu~(3+) phosphor.When the Li+doping content was 0.12,the emission spectrum was 1.61 times stronger than before doping.
In order to enhance the luminous intensity of Na_2CaSiO_4:Eu~(3+),a series of Eu~(3+),Li~+ doped Na_2CaSiO_4 red phosphor were synthesized by high temperature solid method.The structure and luminescence properties of fluorescent power were studied by X-ray powder diffraction and fluorescent analysis.The effect of doping Eu~(3+) and Li~+ concentration on the luminescence performance of fluorescent power were investigated.The results showed that doping Eu~(3+) and Li~+ on the Na_2CaSiO_4 was still a cubic crystal structure,but the cell parameters were changed after doping indicating that Eu~(3+) and Li~+ had entered the lattice.According to ionic electronegativity,the values of Li~+(1.009) and Na~+(1.024) were similar,the values of Eu~(3+)(1.433)and Ca~(2+)(1.160) were similar,leading to their places of Na~+ by Li~+ and Ca~(2+) by Eu~(3+).With the increase of the concentration of Eu~(3+) and Li+doping, the luminescence intensity gradually increased.When the Eu~(3+) doping content is 0.16,the luminescence of fluorescent power Na_2CaSiO_4:Eu~(3+) reached the maximum value.The doping Li~+ could sensitize the Na_2CaSiO_4:Eu~(3+) phosphor.When the Li+doping content was 0.12,the emission spectrum was 1.61 times stronger than before doping.
引文
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[5]Li K Y,Xue D F.Estimation of electronegativity values of elements in different valence states[J].Journal of Physical Chemistry A,2006,110(39):11332-11337.
[6]Li K Y,Kang C Y,Xue D F.Effect of electrostatic and size on dopant occupancy in lithium niobate single crystal[J].Inorganic Chemistry,2013,52(17):10206-10210.
[7]李宫,陈昆峰,金京一,等.La3+掺杂Ni Co层状双金属氢氧化物纳米片的合成及其电化学性能[J].应用化学,2017,34(1):71-75.
[8]杨志平,王凤和,李盼来,等.Eu3+在Li Sr PO4中的发光及浓度猝灭机理[J].硅酸盐通报,2010,29(2):431-435.
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[10]Huang S H,Lou L R.Concentration dependence of sensitizer fluorescence intensity in energy transfer[J].Chinese Journal of Luminescence,1990,11(1):1-7.
[11]Tian Y,Chen B J,Tian B N,et al.Concentration dependent luminescence and energy transfer of flower-like Y2(Mo O4)3:Dy3+phosphor[J].J.Alloys Comp.,2011,509(20):6096-6101.
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