What is Photoluminescence: Definition and 11 Discussions

Photoluminescence (abbreviated as PL) is light emission from any form of matter after the absorption of photons (electromagnetic radiation). It is one of many forms of luminescence (light emission) and is initiated by photoexcitation (i.e. photons that excite electrons to a higher energy level in an atom), hence the prefix photo-. Following excitation various relaxation processes typically occur in which other photons are re-radiated. Time periods between absorption and emission may vary: ranging from short femtosecond-regime for emission involving free-carrier plasma in inorganic semiconductors up to milliseconds for Phosphorescence processes in molecular systems; and under special circumstances delay of emission may even span to minutes or hours.
Observation of photoluminescence at a certain energy can be viewed as an indication that an electron populated an excited state associated with this transition energy.
While this is generally true in atoms and similar systems, correlations and other more complex phenomena also act as sources for photoluminescence in many-body systems such as semiconductors. A theoretical approach to handle this is given by the semiconductor luminescence equations.

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  1. E

    Photoluminescence at lower temperature of carbazole

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  2. T

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  3. B

    I Spectrum of emission in photoluminescence

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  4. Jalo

    I Photoluminescence Excitation (PLE) vs PL spectroscopy

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  5. Benevito

    Photoluminescence at a heterojunction

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  6. E

    Time resolved Photoluminescence analysis

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  7. S

    What caused the secondary peak in our photoluminescence experiment?

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  8. Y

    Relationship between photoluminescence intensity and Absroption Intensity

    I have measured photoluminescence (PL) and light absroption spectra of some transtion metal oxide nanostructures. The PL intensity increases remarkably by decreasing the size of nanostructures. However, the intensity of absorption vary litte. Is there any relationship between the PL intensity...
  9. A

    Photoluminescence vs Absorption

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  10. D

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  11. S

    Information on photoluminescence?

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