永利国际平台登录:Stacked LEDs could shine bright white light


By Jessica Griggs IN THE search for cheap, efficient sources of white light, LEDs have long been touted as offering the most potential. Now a new generation of white organic LEDs could become the source of choice for homes, offices and even computer displays. LEDs are preferable for many applications because they convert electrical energy into photons so efficiently. While incandescent light bulbs convert only 5 per cent of the energy passing through them into light and compact fluorescent bulbs manage 20 per cent efficiency,
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