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Green Light LEDs

Andrew Pottorff. Green Light LEDs. Green Light Challenge. Green LEDs were previously to hard to manufacture Previously made green LEDs weren’t strong enough or bright enough to match red and blue Problem was circumvented by aiming the blue light at a yellow phosphor to emit green light

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Green Light LEDs

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  1. Andrew Pottorff Green Light LEDs

  2. Green Light Challenge • Green LEDs were previously to hard to manufacture • Previously made green LEDs weren’t strong enough or bright enough to match red and blue • Problem was circumvented by aiming the blue light at a yellow phosphor to emit green light • This produces white light, but it is wasteful compared to using a white light based off three LEDs

  3. Why? • Green LEDs allow white light via RGB mix • Cheaper and more efficient than incandescent • Allows variation for lighting during different times of day • No toxic heavy metals involved • Longer lasting

  4. The Numbers • Department of Energy estimates the following: • Could save U.S. $120 billion over the next 20 years • Reduce emissions by 246 metric tons of carbon • Emission reduction is equal to 5% of the total U.S. total emissions from years 1850-2000

  5. Old Development • U.S. Department of Energy’s NREL (National Renewable Energy Laboratory) developed the technology to absorb green light • If layers of lattice don’t match up by leaving too big a gap, the efficiency falls to almost zero • Combined layers of different lattice sizes in order to efficiently absorb light

  6. New Development • NREL researcher Angelo Mascarenhas thought to reverse the process • Mascarenhas’s idea was to send a current through appropriately spaced layers of lattice to obtain green light • He managed to produce green light on the very first try

  7. Forward Motion • NREL wants to produce a fourth color to make the white light even whiter • They would then arrange the four colors in a beehive structure so light will look white from a distance • Researchers want to make their LED light “intelligent” • The lights will dynamically match the ratio of colors to the time of day, allowing increased visibility

  8. Sources • http://www.gizmag.com/first-green-led-light-manufactured/14761/ • http://www.azom.com/news.asp?newsID=18833

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