WHITE PHOTOLUMINESCENCE DEVICE

摘要

A white light emitting device is provided to acquire excellent luminance by using a TbAG:Ce compositional fluorescent substance containing Si or Fe. A white light emitting device includes at least one LED(Light Emitting Diode) capable of emitting light within a wavelength range of 430 to 470 nm and a fluorescent substance of TbAG:Ce composition. The fluorescent substance is represented by a chemical formula of (Tb1-xCex)3(Al1-yFey)5O12, wherein the x is in a first range of 0.01 to 0.4 and the y is in a second range of 0.0 to 0.1. At this time, the value of the y is capable of being selected in a third range of 0.01 to 0.04.