Abstract
Eu2+doped Sr2Si5N8 red phosphors with different Eu2 +concentration were synthesized by high-temperature solid state method. The crystal structure,morphology,luminescence and thermal quenching properties were investigated in detail. X-ray diffraction( XRD) patterns show that a pure phase of Sr2Si5N8 phosphor with high crystallinity has been obtained. Photoluminescence( PL)spectra results indicate that there are two different luminescence centers when Eu2 +ions substitute Sr2 +sites. Thermal stability data show that the thermal quenching property is largely dependent on Eu2 +concentration. The changes of relative intensity ratio and fluorescence lifetime were examined for the two-peak emission in Sr2Si5N8∶ Eu2 +. The results reveal that Eu2 +distribution changes with varying Eu2 +concentration,which should be the mainly mechanism of the thermal quenching behavior for Eu2 +doped Sr2Si5N8 phosphors at low dopant levels.
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