Structural and optical properties of Mn2+ and Li+ codoped ZnGa2O3.95M0.05 (M = S, Se, and Te) phosphors

Structural and optical properties on various kinds of Mn2+ and Li+ codoped ZnGa2O3.95M0.05 (M = S, Se, and Te) were investigated by using X-ray diffraction (XRD), cathodoluminescence (CL), and photoluminescence excitation (PLE) measurements. The results of the XRD patterns showed that the lattice constants of the ZnGa2O3.95M0.05:Mn2+, Li+ decrease with the substitution of S, Se, and Te for the oxygen in the ZnGa2O4. The CL and PLE spectra exhibited that the luminescence intensity of the ZnGa2O3.95Se0.05:Mn2+, Li+ was the strongest among various samples studied in this work. The enhancement of the luminescence intensity in the ZnGa2O3.95Se0.05:Mn2+, Li+ originated from the increase of the conductivity due to Li+ doping These results can help improve understanding Mn2+ and Li+ doped ZnGa2O3.95Se0.05 phosphors for the application in field-emission display devices with high brightness. (C) 2001 Elsevier Science Ltd. All rights reserved.