Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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..

  2. jcsd
  3. Dec 30, 2014 #2

    Doug Huffman

    User Avatar
    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


    User Avatar
    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.


    The wiki article includes the spectrum for a white LED made using RGB LEDs...
    and a white LED made using a Blue LED and a phosphor...
  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
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: White LED
  1. Red or white (Replies: 8)

  2. LED board (Replies: 0)

  3. Photodiodes and LEDs (Replies: 1)

  4. LED efficientcy (Replies: 1)