In the production manner of white LED and uses that the production manner of the back light which and the production mannered null ultraviolet ray

摘要

PPROBLEM TO BE SOLVED: To provide a manufacturing method of a white LED which maintains a high luminance, and is excellent in its color reproducibility, and further, reduces the variation of its luminous chromaticity; to provide a manufacturing method of a back light using the white LED; and further to provide a manufacturing method of a liquid crystal display. PSOLUTION: The manufacturing method of a white LED has a process for coupling to each other previously an ultraviolet-ray emitting diode or a violet-ray emitting diode, and three or more kinds of visible-ray emitting phosphors. The luminous spectrum of the white LED has peak values in a blue portion having wavelengths not shorter than 440 nm and not longer than 460 nm, in a green portion having wavelengths not shorter than 515 nm and not longer than 530 nm, and further, in a red portion having wavelengths not shorter than 620 nm and not longer than 640 nm. Also, it is preferable that the half-value widths of peak values of the respective colors are not wider than 50 nm. PCOPYRIGHT: (C)2007,JPO&INPIT