Comparison With Industrial Oxysulfide Phosphors For Solid State Lighting

摘要

Y_2O_2S:Eu~(3+) was prepared by the flux method which is different from conventional solid state reaction and has many advantages over the conventional method in terms of ease of preparation and yield also. In this paper we have reported the crystal structure, XRD and method of preparation of Y_2O_2S:Eu~(3+) along with Eu~(3+) mechanism of emission and excitation with reference to solid state lighting. In the emission spectra, the strongest red-emission lines at 626 and 616 nm are due to transition from ~5D_0 → ~7F_2 level. The stronger emission at λem=626 nm confirms the formation of the oxysulfide host. We also made a comparison of our prepared sample with commercial sample from NICHIA Corporation Japan in terms of PL intensity which results that our sample is equally intense as that of NICHIA's sample. It is suggested that these characteristics can be useful for obtaining a low cost, red phosphor for the solid state lighting using near UV LED.