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Light

Light
by

Ricardo Matias

on 31 January 2013

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Transcript of Light

The "First" LED Ralph M. Potter
Filed on March 28, 1968
look of the LED.
Little change made to design The Idea of an LED Developed by Nick Holonyak
Patent filed on May 31, 1963
Introduced the basic concept of an LED Fabrication gallium, arsenic, and/or phosphor ingot,
sliced into wafers LED Packaging and Distribution Most commonly found in household products:



But can be purchased in strips gallium arsenide added in layers contacts added by evaporation cut into 6k diodes diodes are encased in plastic with
metal leads, gold wire high cost low output waste byproducts -Ovens
-Televisions
-Christmas Lights Process patented by
Nick Holonyak Jr.
1987 Disposal Disposed of in landfills


Not toxic to environment
-Largely distributed


-Contains no Meccury LED Reuse -Refrigerator lights


-25,000 - 50,000 hours sent to manufacturing plants put into everyday items Can be taken from older electronics and reused


Many reuses because of longevity Maintenance/Installation Little maintenance required
LED bulbs easily installed LED's are packaged in bulk nice Recycling? Because of high cost, many companies (Ikea) recollect used LEDs Luke Fetzer
Ricardo Matias BY & Sources Coxworth, B. (14 F). gizmag. Retrieved from http://www.gizmag.com/led-bulbs-found-to-contain-toxic-metals/17876/

Taub, E. A. (2009, February 11). Retrieved from http://bits.blogs.nytimes.com/2009/02/11/how-long-did-you-say-that-bulb-will-last/

Made how. (n.d.). Retrieved from http://www.madehow.com/Volume-1/Light-Emitting-Diode-LED.html Raise and Extract
Materials Process
Materials Manufacture Use Dispose Recycle The Product Life Cycle Of LED's
Full transcript