A way to improve the efficiency of LEDs

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POSTER: computer news   ||   A WAY TO IMPROVE THE EFFICIENCY OF LEDS	DATE:2012-05-15
The use of LEDs as light source is a very promising direction.  With its small size and low cost they are very effective.  However, they are good, where low power is sufficient, for example - a flashlight, or as part of backlight mobile phone.  There is a problem: if we increase the applied to the LED voltage, trying to get a brighter glow, most of the energy will go into a field produced by a semiconductor, which makes LEDs inefficient for lighting large areas.   A team from the University of California, under the direction of materials science Yuji Zhao , seems to have found a way out of this situation .  They applied a special crystal growth substrate from Mitsubishi Chemical Corporation production, which itself is being made from gallium nitride, allows a special orientation of the crystal lattice and does not allow the appearance of unwanted fields.  Scientists were able to create a blue LED with a peak efficiency of 52%, with 20 mA.  By increasing the amperage supplied by 10 times, we can observe the fall of LEDs efficiency to less than 14%, whereas in the light-emitting diodes used today, it falls to 60%.   Related Products :

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