Study of the electronic structure and luminescence of Mn-doped SrS phosphors

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• 作者：Ankush Vij (1)
  Sanjeev Gautam (1)
  Keun Hwa Chae (1)
  R. Brajpuriya (2)
  S. P. Lochab (3)
  
• 关键词：SrS ; Mn ; PL ; NEXAFS ; TL ; Trapping parameters
• 刊名：Journal of the Korean Physical Society
• 出版年：2012
• 出版时间：November 2012
• 年：2012
• 卷：61
• 期：10
• 页码：1604-1608
• 全文大小：367KB
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• 作者单位：Ankush Vij (1)
  Sanjeev Gautam (1)
  Keun Hwa Chae (1)
  R. Brajpuriya (2)
  S. P. Lochab (3)
  
  1. Advanced Analysis Center, Korea Institute of Science and Technology, Seoul, 136-791, Korea
  2. Amity School of Engineering and Technology, Amity University Haryana, Gurgaon, 122-413, India
  3. Health Physics Lab, Inter University Accelerator Center, New Delhi, 110-067, India
  
• ISSN：1976-8524

文摘

In this paper, the electronic structure and the luminescence properties of Mn (1 mole%)-doped SrS phosphors synthesized by using the solid state diffusion method are reported. The X-ray diffraction pattern reveals a single-phase rocksalt structure, and the average crystallite size calculated using a Williamson-Hall plot is 72 nm. The near-edge X-ray absorption fine structure (NEXAFS) collected at Mn L3,2-edges confirms the presence of divalent Mn in SrS. A bright green photoluminescence (PL) at 547 nm is observed at an excitation wavelength of 355 nm, which may be attributed to the 4 T 1-6 A 1 inner atomic transition of the 3d electrons in the Mn2+ ion under the cubic crystal field of SrS. We have also studied the thermoluminescence (TL) of UV (254 nm)-irradiated Mn-doped SrS phosphors. The TL glow curve has a well-resolved single peak around 360 K, which shifts slightly to lower temperatures with increasing UV exposure time, confirming second-order kinetics. A kinetic analysis of the experimental TL glow curve has been carried out using Chen’s peak shape method to determine the trapping parameters.