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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。
Ba1.97-yZn1-xMgxSi2O7: 0.03Eu, y Ce3 + phosphors were synthesized in the air by high temperature solid-state reaction. The phase and luminescent properties of synthesized phosphor were characterized by X-ray diffraction and fluorescence spectroscopy. The emission spectrum of Ba1.97-yZn1-xMgxSi2O7: 0.03Eu solid solution phosphor exhibits multi-spectral peak emission in the range of 350-725 nm and strong broadband emission at 360 and 500 nm under the excitation of 330-360 nm UV light The 4f 65d1-4f 7 transitions of Eu2 + ions and the narrow bands of 590-525 nm in the red region originate from the 5D0-7FJ (J = 1, 2, 3, 4) transitions of Eu3 +. This indicates that in the air atmosphere some Eu3 + Ba1.97-yZn1-xMgxSi2O7 matrix was reduced to Eu2 +. When x = 0.1, the green luminescence of the phosphor Ba1.97Zn0.9Mg0.1Si2O7:0.03Eu was the strongest, indicating that Eu3 + was reduced to Eu2 + to the maximum extent. When Ce3 + ions were co-doped, a Ba1.97-yZn0.9Mg0.1Si2O7: 0.03Eu, y Ce3 + phosphor system was formed. The emission of Ce3 + reached the orange-red zone from the blue-green zone to the white zone with the increase of Ce3 + ion concentration. The nominal composition of Ba1.96Zn0.9Mg0.1Si2O7:0.03Eu, 0.01Ce3 + phosphor color coordinates (0.323,0.311), close to the ideal white, is a potentially useful white phosphor. The energy transfer and luminescence mechanism of rare earth ions in Ba2Zn0.9Mg0.1Si2O7 matrix were discussed.