Abstract
SrxCa1−xAlSiN3: Eu2+ phosphors were prepared by using the high temperature solid state reaction in a 1.1Mpa N2 atmosphere. The phase structures, photoluminescence (PL) properties, and chromaticity properties of the phosphors affected by Sr/Ca Substitution have been investigated in detail. With increasing Sr content (x value), the crystal grain became bigger and the average grain size increased from 5µm to 10µm. PL emission bands of SrxCa1−xAlSiN3: Eu2+ showed a blue-shift from 660 (x=0) to 617nm (x=0.8), the shoulder of the excitation spectra around 550nm showed a slightly blue-shift and decay lifetime shortened from 776.96 (x=0.2) to 642.35ns (x=0.8). Both the emission and excitation intensity of peak position increased with Sr content increased. The ideal white light with high CRI (Ra>88) can be obtained by mixing the SrxCa1−xAlSiN3: Eu2+ phosphors and commercial green phosphors with appropriate proportion of the components.
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