RED PHOSPHOR MATERIAL, WHITE LIGHT-EMITTING DIODE USING THE SAME, AND ILLUMINATOR USING THE WHITE LIGHT-EMITTING DIODE

摘要

PPROBLEM TO BE SOLVED: To provide a white light-emitting diode improved in color reproducibility, color rendering tendency and luminous efficiency. PSOLUTION: A red phosphor material consisting of an europium-activated calcium-lanthanum tungstate of the general formula: CaSB3/SB(LaSB1-x/SBEuSBx/SB)WSB2/SBOSB12/SB(0x1) is provided. The white light-emitting diode using the red phosphor material is also provided. This diode efficiently emits red color in the luminous wavelength region for ultraviolet light-emitting diode, i.e. 350-410 nm and also can efficiently convert to red color the rays of about 465 nm falling in the wavelength region for blue light-emitting diode and rays of about 538 nm falling in the wavelength region for green light-emitting diode, respectively. PCOPYRIGHT: (C)2005,JPO&NCIPI