Photoluminescence behavior of manganese-doped zinc silicate phosphors

The purpose of the present study is to develop an understanding of the photoluminescence properties of Mn2+-doped zinc silicate (Zn2SiO4:Mn) phosphors, which have served as a gree-emitting phosphor in many industrial applications. Thus, several experimental techniques, such as time-resolved emission spectra, decay curves, and time-resolved photoluminescence excitation spectra, have been conducted on Zn2SiO4:Mn phosphors, The characterization has been performed in terms of dopant concentration. The decay curves, together with the characteristic decay time, in particular, are measured as a function of excitation-light wavelength, in the range of 200-520 nm, The decay behavior is strongly dependent on the excitation-light wavelength. The excitation range is categorized into three regimes: the manganese direct excitation range, below the absorption-edge (E-T) energy level; the manganese ionization range, from E-T to the optical band-gap energy (E-g) of Zn2SiO4; and the intergap transition range, above the E-g energy level.