Lv 7
Kevin7 asked in Science & MathematicsPhysics · 1 decade ago

What is the difference between fluorescence and phosphorescence?

4 Answers

  • 1 decade ago
    Favorite Answer

    Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation of a different wavelength. In most cases, emitted light has a longer wavelength, and therefore lower energy, than the absorbed radiation. However, when the absorbed electromagnetic radiation is intense, it is possible for one electron to absorb two photons; this two-photon absorption can lead to emission of radiation having a shorter wavelength than the absorbed radiation.

    Phosphorescence is a specific type of photoluminescence related to fluorescence. Unlike fluorescence, a phosphorescent material does not immediately re-emit the radiation it absorbs. The slower time scales of the re-emission are associated with "forbidden" energy state transitions in quantum mechanics. As these transitions occur less often in certain materials, absorbed radiation may be re-emitted at a lower intensity for up to several hours.

  • Anonymous
    4 years ago

    Fluorescence Vs Phosphorescence

  • Anonymous
    5 years ago

    For the best answers, search on this site

    The Difference Between Fluorescence & Phosphorescence: What is Fluorescence? Some materials absorb invisible, high-energy "black" (ultraviolet) light, use part of the energy, then emit nanoseconds later bright visible light, but only while the ultraviolet light shines on it. What is Phosphorescence? Phosphorescence is similar to fluorescence. Both involve absorption of energy. "Glow-in-the-dark" light (phosphorescence) is not as bright as fluorescence but lasts much longer. Phosphorescence is controlled by "forbidden" quantum physics transitions. Quantum Physics Transitions Quantum physics transitions are changes in molecular states made possible by energy absorption. Energy changes are quantized if they can only be absorbed or emitted in predetermined values or "quanta." After absorption, lower energy photons (light particles) can be re-emitted. Practical Uses Fluorescence is utilized in medicine, while phosphorescence is used for glow-in-the-dark products. Hobbyist Uses Mineralogists treasure fluorescent rocks. .....

  • 1 decade ago

    Fluorescence is the emission of light by any substance that has earlier absorbed radiation from a source. In case of phosphorescent it doesn't immediately re-emit the light it absorbed.

Still have questions? Get your answers by asking now.