Citation: Peng Jun LIU, Ying Liang LIU. Preparation of CaS:Eu2+ Phosphor by Microwave Heating Method and its Luminescence[J]. Chinese Chemical Letters, ;2000, 11(9): 843-846.
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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 nm and 560 nm and the maximum emission of the phosphor is 630 nm.When the concentration of Eu2+ in CaS increases from 1.0×10-5 to 1.0×10-2 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% Eu2+-doped and is a kind of good material excited by sunlight.
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Keywords:
- Microwave radiation heating,
- calcium sulphide,
- europium,
- luminescence
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