The purpose of the present study is to develop an understanding of the photoluminescence properties of Mn 2+ -doped zinc silicate (Zn 2 SiO 4 :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 timeresolved photoluminescence excitation spectra, have been conducted on Zn 2 SiO 4 :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 Zn 2 SiO 4 ; and the intergap transition range, above the E g energy level.

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