X-ray absorption spectroscopy and photoluminescence study of rare earth ions doped strontium sulphide phosphors
- X-ray absorption spectroscopy and photoluminescence study of rare earth ions doped strontium sulphide phosphors
- Ankush Vij; Sanjeev Gautam; Vinay Kumar; R. Brajpuriya; Ravi Kumar; Nafa Singh; 채근화
- NEXAFS; SrS:Sm; PL emission and excitation
- Issue Date
- Applied surface science
- VOL 264, 237-241
- We present here the electronic structure and photoluminescence properties of Sm (0.1–1.0 mol%) doped
SrS phosphors. The doping in SrS was probed by near-edge X-ray absorption fine structure (NEXAFS) at
M5,4-edges of Sm in total electron yield mode. The simulated absorption edges using atomic multiplet
calculations were correlated with experimental results, which clearly reveal the presence of trivalent
state of Sm in SrS matrix. However, for Sm (1 mol%), very minor traces of Sm2+ were also observed, which
have been explained by comparing the NEXAFS spectra in total electron and florescence yield mode.
The PL emission of SrS:Sm comprises of three sharp bands at 567, 602 and 650 nm owing to the wellknown
intra 4f transitions from 4G5/2 to 6HJ (J = 5/2, 7/2, 9/2) levels of Sm3+ ions in SrS host. The effect
of Ce co-doping on SrS:Sm phosphors was also investigated, which exhibits characteristic PL emission
of independent ions at their respective excitation wavelengths. However, at an excitation wavelength
of 393 nm, SrS:Ce,Sm exhibits the simultaneous characteristic PL emission of both ions spanning into
blue–green–red region. The CIE chromaticity coordinates also clearly show the influence of excitation
wavelengths on the emission colour of SrS:Ce,Sm.
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