In Japan plans to begin production of white LEDs TRUE
The company Sumitomo Electric obedinalas now Procomp, a joint venture Supra Opto Inc., Which owns Procomp 60 per cent share. The company Sumitomo will provide its own technology and equipment.
The basis of the new LEDs should become a semiconductor ZnSe, developed by Sumitomo four years ago. The diode is a blue LED ZnSe, grown on the ZnSe-substrate. The active area of the conductor while emits blue light, and substrate - yellow. This new LED is radically different from the already produced white LEDs, which uses a blue LED is combined with a yellow phosphor, or a combination of an ultraviolet LED or polychromatic tricolor phosphor.
In this development firm Sumitomo does not affect the scope of the patents owned by companies Nichia, Osram and others.
Sumitomo claims that the ZnSe white LEDs have a number of advantages. When used in the LED device assembly phosphorus complicated, and the overall efficiency of light emission decreases. ZnSe substrate is conductive devices such as GaN-on-sapphire, which allows the use of his upper and lower surface as the contact pads.
In addition, the LED ZnSe works at a voltage 2.7 V and is very resistant to static discharge.
Moreover, LEDs can emit light of ZnSe on a much wider range of color temperatures than the GaN based devices (3500 - 8500 K compared to 6000 - 8500K). This will create devices with a warm glow, which is more like the Americans and the Europeans.
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