空气中合成固溶体荧光粉Ba2(Zn,Mg)Si2O7∶Eu^2＋,Eu^3＋,Ce^3＋及其发光特性  

Solid-Solution Phosphor Ba_2(Zn,Mg)Si_2O_7∶Eu^(2+),Eu^(3+),Ce^(3+) Prepared in Air and Its Luminescent Properties

作　　者：邓升智 刘晨[1] 杨楚珺 邱忠贤[1] 周文理[1] 张吉林[1] 余丽萍[1] 廉世勋[1] 

机构地区：[1]湖南师范大学化学化工学院,化学生物学及中药分析教育部重点实验室,资源精细化与先进材料湖南省高校重点实验室,长沙410081

出　　处：《无机化学学报》2015年第2期229-236,共8页Chinese Journal of Inorganic Chemistry

基　　金：湖南省高校科技创新团队计划(湘教通[2012]318号);湖南省自然科学基金(No.2015JJ2100);国家大学生创新性实验计划资助项目

摘　　要：采用高温固相法在空气中合成了Ba1.97-yZn1-xMgxSi2O7∶0.03Eu,y Ce3+系列荧光粉。分别采用X-射线衍射和荧光光谱对所合成荧光粉的物相和发光性质进行了表征。在紫外光330~360 nm激发下,固溶体荧光粉Ba1.97-yZn1-xMgxSi2O7∶0.03Eu的发射光谱在350~725 nm范围内呈现多谱峰发射,360和500 nm处有强的宽带发射属于Eu2+离子的4f 65d1-4f 7跃迁,590~725 nm红光区窄带谱源于Eu3+的5D0-7FJ(J=1,2,3,4)跃迁,这表明,在空气气氛中,部分Eu3+在Ba1.97-yZn1-xMgxSi2O7基质中被还原成了Eu2+;当x=0.1时,荧光粉Ba1.97Zn0.9Mg0.1Si2O7∶0.03Eu的绿色发光最强,表明Eu3+被还原成Eu2+离子的程度最大。当共掺入Ce3+离子后,形成Ba1.97-yZn0.9Mg0.1Si2O7∶0.03Eu,y Ce3+荧光粉体系,其发光随着Ce3+离子浓度的增大由蓝绿区经白光区到达橙红区;发现名义组成为Ba1.96Zn0.9Mg0.1Si2O7∶0.03Eu,0.01Ce3+的荧光粉的色坐标为(0.323,0.311),接近理想白光,是一种有潜在应用价值的白光荧光粉。讨论了稀土离子在Ba2Zn0.9Mg0.1Si2O7基质中的能量传递与发光机理。Ba1.97Zn1-xMgxSi2O7：0.03Eu and Ba1.97-yZn0.9Mg0.1Si2O7：0.03Eu,yCe^3＋ phosphors were synthesized in air condition by a high temperature solid-state reaction. Crystallization and optical properties were investigated by using powder X-ray diffraction and fluorescence spectrophotometer, respectively. Under the excitation of ultraviolet （330-360 nm）, the emission spectra of these solid-solution phosphors exhibit multi-emission bands peaked at about 360 nm（blue-purple color）, 500 nm （green color） and 590-725 nm （red color）, the two formers are corresponding to the 4f^65d^1-4f^7 transition of Eu^2＋, the latter is originated from the ^5D0-^7FJ（J=1,2,3,4） transitions of Eu^3＋. The investigated results indicate that part of Eu^3＋ can be self-reduced to Eu2＋ in the matrix and will reach the maximum when x=0.1 mol. When co-doping Ce^3＋ ions, the luminescent colors of the phosphors Ba1.97-yZn0.9 Mg0.1Si2O7：0.03Eu,yCe^3＋ can be tunable from green to white to orange area. It had been found that the nominal composition Ba1.96Zn0.9Mg0.1Si2O7：0.03Eu,0.01Ce^3＋ phosphor provides a white emission （0.323, 0.311） that is very close to the standard white （x=0.33, y=0.33）, which shows that it is a potential white phosphor for LED-based UV-ehip. The energy transfer processes among rare earths and the luminescent mechanism were discussed.

关 键 词：Ba1.97Zn1-xMgxSi2O7 Ba1.97-yZn0.9Mg0.1Si2O7∶0.03Eu yCe^3+ 自还原 白光荧光粉 

分 类 号：O614.33[理学—无机化学]