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Raman scattering spectroscopy is applied to investigate the phonon modes in Ga x In 1- x P ( x =0.52) and (Al x Ga 1- x ) 0.51 In 0.49 P ( x =0.29) alloys. Two mode behavior in Ga x In 1- x P and three mode behavior in (Al x Ga 1- x ) 0.51 In 0.49 P are observed. In ordered Ga x In 1- x P, we clearly distinguish the TO 1(GaP like) mode and the splitting of LO 1(GaP like) and LO 2 (InP like) modes, which is believed to be the result of superlattice effect of ordering, and the LO 1+LO 2 mode, which is observed for the first time. In addition to the b/a ratio, it’s found that the relative intensity of the FLA and the LO 1+LO 2 modes also corresponds to the degree of order. The TO 1 and the splitting of LO 1 and LO 2 devote together to the reduction of the “valley depth”. In (Al x Ga 1- x ) 0.51 In 0.49 P, the doubling of FLA is observed. Due to the influence of Al composition, the GaP like LO mode becomes a shoulder of the InP like LO mode. The unresolved Raman spectra indicate the existence of ordered structure in (Al x Ga 1- x ) 0.51 In 0.49 P alloys.
Raman scattering spectroscopy is applied to investigate the phonon modes in Ga x In 1- x P (x = 0.52) and (Al x Ga 1- x) 0.51 In 0.49 P (x = 0.29) alloys. 1-x P and three mode behavior in (Al x Ga 1- x) 0.51 In 0.49 P are observed. In ordered Ga x In 1- x P, we clearly distinguish the TO 1 (GaP like) mode and the splitting of LO 1 (GaP like) and LO 2 (InP like) modes, which are believed to be the result of superlattice effect of ordering, and the LO 1 + LO 2 mode, which is observed for the first time. In addition to the b / a ratio, it’s found that the relative intensity of the FLA and the LO 1 + LO 2 modes also corresponds to the degree of order. The TO 1 and the splitting of LO 1 and LO 2 devote together to the reduction of the “valley depth ”In (Al x Ga 1- x) 0.51 In 0.49 P, the doubling of FLA is observed. Due to the influence of Al composit ion, the GaP like LO mode becomes a shoulder of the InP like LO mode. The unresolved Raman spectra indicate the existence of ordered structure in (Al x Ga 1- x) 0.51 In 0.49 P alloys.