Patent attributes
A white-light light emitting diode device comprising a light emitting diode element capable of emitting violet light at a wavelength of 400 to 419 nm and a ceramic composite material, wherein the ceramic composite material is a solidified body in which a cerium-activated Y3Al5O12 (Y3Al5O12:Ce) crystal and an α-type aluminum oxide (Al2O3) crystal are continuously and three-dimensionally entangled with each other, the solidified body having not only a photoluminescent property of wavelength-converting a part of the violet light into yellow light but also a function of transmitting a part of the violet light, and the violet light transmitted through the ceramic composite material and yellow light resulting from wavelength conversion by the ceramic composite material are mixed to emit pseudo-white light.
