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Photoluminescence vs Absorption

  1. Jan 4, 2010 #1
    Hi guys (and girls;))
    I need your help...
    I really don't get the difference between a PhotoLuminescence and Absorption experiment. What kind of informations one can get from each experiment?
    Moreover, why generally photoluminescence experiments are carried on at low temperatures?

    Thanks very much,
  2. jcsd
  3. Jan 10, 2010 #2
    I'm never done the absorption exp before. But I think the process between both experiments is same. the difference is only on the data that you get from the exp.

    for e.g., pls refer to this journal (Figure 3 (a) and (b): http://hal.archives-ouvertes.fr/docs/00/22/41/94/PDF/ajp-jphyscol198445C573.pdf

    Why at low T?
    It's to prevent the electron from thermal excitation. So, you really can make sure that the electron is sitting on the lowest energy level.

    *Sorry, my English is not very good.
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