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- 저자 : R. Brajpuriya (검색결과 1 건)
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Study of the Electronic Structure and Luminescence of Mn-doped SrS Phosphors
Ankush Vij,Sanjeev Gautam,채근화,R. Brajpuriya,S.P. Lochab 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.10
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 L<sub>3,2</sub>-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 <sup>4</sup><i>T</i><sub>1</sub>−<sup>6</sup><i>A</i><sub>1</sub> inner atomic transition of the 3<i>d</i> electrons in the Mn<sup>2+</sup> 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.
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