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White LED

  1. Dec 30, 2014 #1
    Hi there, how one can compute the spectral power distribution of white LED ,i,e like black body radiator that has a formula of calculation..

    regards
     
  2. jcsd
  3. Dec 30, 2014 #2

    Doug Huffman

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    Gold Member

    A white LED is a composite. LED's emit single wavelength photons no one of which is white.
     
  4. Dec 30, 2014 #3
    what I meant that the resulted spectrum of the combination ..does it have IR-radiation in that spectrum
     
  5. Dec 30, 2014 #4

    CWatters

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    Science Advisor
    Homework Helper

    Acording to Wikipedia there are at least three ways to make a "white" LED and all will have a slightly different spectrum.

    http://en.wikipedia.org/wiki/Light-emitting_diode#Other_white_LEDs

    The wiki article includes the spectrum for a white LED made using RGB LEDs...
    http://en.wikipedia.org/wiki/Light-...wer/File:Red-YellowGreen-Blue_LED_spectra.png
    and a white LED made using a Blue LED and a phosphor...
    http://en.wikipedia.org/wiki/Light-emitting_diode#mediaviewer/File:White_LED.png
     
  6. Dec 30, 2014 #5
    thanks,,as it is known for continuous spectrum that resulted from incandescent lamp,Planck law is employed to plot the spectral power distribution of such a source, but for the white LED I could not find a way to do the same as it is not treated as a black body radiator...thanks
     
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