A method for manufacturing white light source includes the steps of
providing an ultra-violet light as radiation source; and preparing two
kinds of phosphors each receiving the ultra-violet light and emitting
light of different wavelength. One phosphor is designated to emit light
covering two wavelength regimes of three primitive colors, i.e., red light
(585-640 nm), green light (500-570 nm) and blue light (430-490 nm), and
another phosphor is designated to emit light covering remaining wavelength
regime of the three primitive colors. The phosphors are mixed in
predetermined ratio such that the lights of different wavelength are
combined to provide a white light.
