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- W2028656499 abstract "Samples of CaxSr1-xS with 0 <=x <1, in increments of 0.1, were prepared by reduction of mixed sulphates with H2/H2S at 1150°C, and their photoluminescence properties were determined. At 300 K the dominant emissions from CaS and SrS are at 360 and 389 nm respectively. For intermediate compositions the peak moves to 390 nm, strengthens and is supplemented by a peak at 530 nm which becomes dominant for the slightly Ca-rich mid-range compositions. At 77 K the dominant emissions are at 385 nm for CaS and 370 and 460 nm for SrS with enhanced intensities relative to those at 300 K. Intermediate compositions behave in a complex manner with a range of emission energies at, e.g., 395, 425, and 445 nm which become dominant in some samples. Additional excitation energies are observed for the mid-range samples at significantly less than the band edge. It is proposed that these emissions and excitation energies are related to electronic transitions to an from anion vacancies in a variety of environments within the lattice." @default.
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- W2028656499 date "1988-01-01" @default.
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- W2028656499 title "Composition effects on excitation and flourescence emission spectra in CaxSr1-xS" @default.
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- W2028656499 doi "https://doi.org/10.1016/0022-0248(90)90787-l" @default.
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