Optical absorption of vanadium doped ZnGa2Se4 single crystals

Abstract

Vanadium doped ZnGa2Se4 single crystals were grown by the chemical vapor transport method. Optical absorption peaks in the measurement of the vanadium doped ZnGa2Se4 single crystal absorption spectrum at 6020, 9319, 12716, and 15290 cm−1 bands are found to be the electron transition of V3+ ion with Td symmetry from ground state A32(F3) to excited states T32(3F),3T1(3F),3T1(3P), and E1(G1). Crystal-field parameter and Racah parameters, which were obtained from the optical-absorption peaks, are found to be `Dq=602 cm−1, B=265 cm−1, and C=5294 cm−1, respectively. We also found the value of B is reduced 70% compared to the V3+ free ion. The V3+ ion splits into three states: Γ3+Γ5, Γ4, Γ1 by the first-order spin-orbit coupling effect. Hence, the spin-orbit coupling constant is λ=−312 cm−1.