Sharp to Employ White LED Using Sialon

Sep 15, 2009
Hideyoshi Kume, Nikkei Electronics
The green-colored "β-sialon"
The green-colored "β-sialon"
[Click to enlarge image]
A white LED will be composed of green- and red-colored phosphors and a blue LED chip (right).
A white LED will be composed of green- and red-colored phosphors and a blue LED chip (right).
[Click to enlarge image]

Denki Kagaku Kogyo K.K. announced Sept 11, 2009, that it will launch a fluorescent material business with its sialon phosphors, such as yellow-colored "α-sialon" and green-colored "β-sialon," for white LEDs in October 2009.

The sialon phosphors are aimed at backlight units of LCD TVs and LED lighting equipment. The company expects sales of several billion yen per year.

Compared with silicate-based green phosphors, which are currently used, the luminance and color of the β-sialon do not change much when its temperature rises. It is because the crystal structure of sialon is stable against temperature change.

Denki Kagaku Kogyo expects that the sialon phosphors will contribute to enhancing the luminance of LCD TVs. The company developed a sialon phosphor for use in backlight units in collaboration with Sharp Corp, which will employ the phosphor for its products.

Sialon (SiAlON) is made by replacing some of the silicon and nitrogen of Si3N4 with aluminum and oxygen, respectively.