Abstract
In this paper, to discover the host material properties of ZnS-type phosphor according to sintering temperatures from 750 to 1150 °C, the self-defects in ZnS are investigated by the changes of the crystal structure in X-ray diffraction and of the optical properties in photoluminescence and decay time. ZnS grows to the sphalerite structure and emission peaks of ZnS are observed at 460 and 528 nm when the sintering temperature is less than 950 °C. The sphalerite and wurtize structures in ZnS coexist and emission peaks are observed at 460, 440 and 515 nm when the sintering temperature is over 1050 °C. The emission peaks at 460 nm appearing in the sphalerite structure and at 440 nm appearing in the wurtize structure are due to zinc vacancy. The emission peaks at 528 nm appearing in the sphalerite structure and at 515 nm appearing in the coexisting sphalerite and wurtize structure are explained as being due to radiative transition from the energy level of sulfur vacancy to valence band.
Published Version
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