Blue photoluminescence of α-Ga[sub 2]S[sub 3] and α-Ga[sub 2]S[sub 3]:Fe[sup 2+] single crystals

Chang-Sun Yoon; Medina, F.D.; Martinez, L.; Tae-Young Park; Moon-Seog Jin; Wha-Tek Kim
September 2003
Applied Physics Letters;9/8/2003, Vol. 83 Issue 10, p1947
Academic Journal
α-Ga[sub 2]S[sub 3] and α-Ga[sub 2]S[sub 3]:Fe[sup 2+] single crystals were grown by the two-zone sublimation method. The optical energy gaps of α-Ga[sub 2]S[sub 3] and α-Ga[sub 2]S[sub 3]:Fe[sup 2+] at 10 K were found to be 3.440 and 3.392 eV, respectively. From the absorption spectra of α-Ga[sub 2]S[sub 3]:Fe[sup 2+], the crystal field parameter Dq of 345 cm[sup -1] and Racah parameters B of 700 and C of 3365 cm[sup -1] were obtained for tetrahedral Fe[sup 2+] ions. From the photoluminescence spectra at 10 K, the blue and red emissions at 424 and 643 nm, respectively, for α-Ga[sub 2]S[sub 3] and the violet and yellow emissions at 400 and 580 nm, respectively, for α-Ga[sub 2]S[sub 3]:Fe[sup 2+] were observed. All the emission lines observed in the photoluminescence spectra were identified. © 2003 American Institute of Physics.


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