Modification of Luminescent Properties of Red Sulphide Phosphors for White LED Lighting

A kind of sulphide, CaS:Eu2+, activated by europium ion for white LED lighting was synthesized via solidstate reaction route in reducing atmospheres. The phosphors were then encapsulated with silicone resin. Moreover, chemical structure of the phosphors was characterized by XRD. Microstructure of the powders was observed by SEM. Spectra of excitation and emission for the phosphors were also obtained by a spectrophotometer. Effect of processing parameters on the luminescent properties of the powders was systematically studied to result in the phosphors with good chemical stability and maximal relative luminescent intensity.