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The National Institute of Materials Research (NIMS) announced the successful production of white LEDs consisting of red and green phosphors and blue LED chips. The composition ratio of red, green, and blue can be arbitrarily changed, and a light source that conforms to the color characteristics of the color filter can be designed. When the white LED is used for the backlight source of the liquid crystal panel, the NTSC ratio is 91% when the color expression range is analog, which is higher than that of the conventional YAG phosphor LED.
Green phosphor "β-SiAlON" (left) and red phosphor "CaAlSiN3"
The white LED developed this time is a combination of a blue LED chip and an improved product of two phosphors previously developed by NIMS, the red phosphor "CaAlSiN3" and the green phosphor "β-SiAlON". For light of a wavelength of 460 nm emitted by a blue LED, the red phosphor can convert it into red light of 650 nm, which can be converted into green light of 540 nm by a green phosphor. In this way, three primary color components of red, green, and blue are generated.
Conventional white LED backlights are mostly composed of a combination of a blue LED chip and a yellow phosphor. Although Sony proposed a backlight design using red, green, and blue monochromatic LEDs, three LED driver circuits are required.
The results of this research will be announced at the 55th Joint Conference on Applied Physics, which opened on March 27, 2008 at the University of Japan.
Blue LED and luminescent properties of green and red phosphors
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