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This is the first report of using the microwave heating technique to synthesize calcium sulphide activated by europium whose structure is determined as the face-centered cubic by conventional X-ray powder diffraction method. The phosphor has maximum excitation peaks located at 280 urn and 560 urn and the maximum emission of the phosphor is 630 nm. When the concentration of Eu~(2+) in CaS increases from I .0 × 10~(-5) to l.0 × 10~(-2) mole per mole host, the body colour of the calcium sulphide activated with europium changes from white, through light-red to pink to deep-red. The phosphor obtains the longest afterglow at the concentration of 0.1% Eu~(2+)doped and is a kind of good material excited by sunlight.
This is the first report of using the microwave heating technique to synthesize calcium sulphide activated by europium whose structure is determined as the face-centered cubic by conventional X-ray powder diffraction method. The phosphor has maximum excitation peaks located at 280 urn and 560 urn and the maximum emission of the phosphor is 630 nm. When the concentration of Eu 2+ in CaS increases from 1.0 × 10 -5 to 1.0 × 10 -2 mole per mole host , the body color of the calcium sulphide activated with europium changes from white, through light-red to pink to deep-red. The phosphor gives the longest afterglow at the concentration of 0.1% Eu ~ (2+) doped and europium good material excited by sunlight.