Abstract
The yellow–orange phosphors Sr1.99−x−yCaxMySi1−yZyO4: 0.01Eu2+ (M=Y3+, K+, Z=Al3+, P5+, 0⩽x⩽0.9, 0⩽y⩽0.01) were synthesized by the solid state reaction. X-ray diffraction and photoluminescence spectra were utilized to characterize the samples. The results indicate that the phosphors can be efficiently excited by the UV–blue light and show a broad band emission from about 425 to 700nm. Ca2+ plays an important role in the red-shift of the emission band in Sr1.99−xCaxSiO4: 0.01Eu2+. When the Ca2+ concentration x=0.7, the emission peak under the excitation of 450nm reaches a maximum at about 600nm, which implies that the samples Sr1.99−xCaxSiO4: 0.01Eu2+ could serve as a red phosphor for the blue LEDs. The trace doping of Al3+ and P5+ with Y3+ and K+ as charge compensation significantly enhances the emission intensities of Sr1.29Ca0.7SiO4: 0.01Eu2+. In addition, thermal properties of typical samples are also carefully investigated.
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