Red fluorescence material, white light emitting diode using red fluorescence material, and illumination system using a white light emitting diode

摘要

The present invention achieves an improvement in color reproducibility, color rendering properties and light emission efficiency of a white light emitting diode. The present invention is a red fluorescent material consisting of a europium-doped calcium lanthanum tungstate represented by the general formula Ca¶³¶ (La¶1-x¶, Eu¶x¶) ¶2¶W¶2¶O ¶12¶ (0 x 1) is represented. The red fluorescent material can effectively convert light in the light emission wavelength region of 350 to 410 nm of an ultraviolet light emitting diode to red light, and can effectively convert blue light at 465 nm and green light at 538 nm to red light.