Raman Spectra for Eu Doped Ln2O2S Phosphors

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  • Raman Spectra for Eu Doped Ln<SUB>2</SUB>O<SUB>2</SUB>S Phosphors
  • Raman Spectra for Eu Doped Ln2O2S Phosp

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Raman spectra for Ln2O2S: Eu (Ln=Lu, Y, Gd and La) have been measured at room temperature. The observed four Raman lines are divided into low and high-frequency groups, each consisting of A1g and Eg modes in representations of D3d crystal point group. The high-frequency lines shift toward low frequency with increasing unit cell volume, and the low-frequency lines decrease in frequency with increasing crystal mass. The Raman active modes are assigned as even vibrations of the Ln2O2 parallelogram in the unit cell on the basis of the factor group analysis. The Raman lines shift continuously with increasing Eu concentration in Y2(1−x)Eu2xO2S and no additional mode appears. This fact indicates that the mixed oxysulfide crystal is not a mixture of the lattices of its components, but a unique lattice.

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