Study of the Electronic Structure and Luminescence of Mn-doped SrS Phosphors

Title
Study of the Electronic Structure and Luminescence of Mn-doped SrS Phosphors
Authors
Ankush VijSanjeev Gautam채근화R. BrajpuriyaS. P. Lochab
Keywords
SrS:Mn; PL; NEXAFS; TL; SrSTrapping parameters
Issue Date
2012-12
Publisher
Journal of the Korean Physical Society
Citation
VOL 61, NO 10, 1604-1608
Abstract
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 4T1−6A1 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.
URI
http://pubs.kist.re.kr/handle/201004/44345
ISSN
03744884
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KIST Publication > Article
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