Citation: Ravi Shrivastava, Jagjeet Kaur. Studies on long lasting optical properties of Eu²⁺ and Dy³⁺ doped di-barium magnesium silicate phosphors[J]. Chinese Chemical Letters, ;2015, 26(9): 1187-1190. doi: 10.1016/j.cclet.2015.05.028 shu

Studies on long lasting optical properties of Eu²⁺ and Dy³⁺ doped di-barium magnesium silicate phosphors

Ravi Shrivastava ^, ,
Jagjeet Kaur

1.
Govt. VYT PG Autonomous College, Durg(CG) 490011, India

Corresponding author: Ravi Shrivastava,
Received Date: 2 December 2014
Available Online: 27 April 2015

Di-bariummagnesium silicate phosphors doped with europiumand dysprosium were prepared under a weak reducing atmosphere. X-ray diffraction pattern of the sample was also done that confirmed the proper preparation of the phosphor. Scanning electron microscope (SEM) images confirmed that the sample has regular surface and uniform grain size distribution. Comparative studies of phosphorescence decay of Ba₂MgSi₂O₇:Eu²⁺, Dy³⁺ phosphors with different concentration of Dy³⁺ were done. The phosphor with 0.5/1.5 mol% of Eu/Dy, exhibited optimum green color afterglow properties. This emission is expected to arise due to transition of Eu²⁺ ions from any of the sublevels of 4f⁶5d¹ configuration to ⁸S_7/2 level of the 4f⁷ configuration. For a suitable trap depth, the trap concentration is expected to be proportional to the concentration of Dy³⁺. These traps are responsible for holding the charge career for a reasonable time, subsequently for increasing the time of afterglow. Hence, optimum Dy³⁺ concentration produces the longer afterglow duration with higher intensity of luminescence signals. Trap depth were also calculated using thermoluminescence glow curve which was indicative of formation of traps suitable for long afterglow.
- Phosphorescence,
- XRD,
- Persistence luminescence,
- Trapping center
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沈阳化工大学材料科学与工程学院沈阳 110142

Studies on long lasting optical properties of Eu2+ and Dy3+ doped di-barium magnesium silicate phosphors

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通讯作者: 陈斌, bchen63@163.com

Studies on long lasting optical properties of Eu²⁺ and Dy³⁺ doped di-barium magnesium silicate phosphors