LED external quantum efficiency

Discussion in 'Homework Help' started by rico2010, Dec 8, 2014.

  1. rico2010

    Thread Starter New Member

    Dec 8, 2014
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    Hi all, I need some help on the following question:

    A blue LED is emitting a 470nm light at a measurable output power of 16mW while the current of the device is 20mA. Calculate the external quantum efficiency of the LED. (1eV = 1.6*10^-19J, electronic charge(e) = 1.6*10^-19C)

    I know this is not very related to electronic circuit, but I don't have a better place to seek for help.

    Thanks all.
     
  2. crutschow

    Expert

    Mar 14, 2008
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    How is the external quantum efficiency defined?
     
  3. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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