Blue photoluminescence of α-Ga2S3 and α-Ga2S3:Fe2+ single crystals

alpha-Ga2S3 and alpha-Ga2S3:Fe2+ single crystals were grown by the two-zone sublimation method. The optical energy gaps of alpha-Ga2S3 and alpha-Ga2S3:Fe2+ at 10 K were found to be 3.440 and 3.392 eV, respectively. From the absorption spectra of alpha-Ga2S3:Fe2+, the crystal field parameter Dq of 345 cm(-1) and Racah parameters B of 700 and C of 3365 cm(-1) were obtained for tetrahedral Fe2+ ions. From the photoluminescence spectra at 10 K, the blue and red emissions at 424 and 643 nm, respectively, for alpha-Ga2S3 and the violet and yellow emissions at 400 and 580 nm, respectively, for alpha-Ga2S3:Fe2+ were observed. All the emission lines observed in the photoluminescence spectra were identified. (C) 2003 American Institute of Physics.