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  2. Quantum dot - Wikipedia

    en.wikipedia.org/wiki/Quantum_dot

    Type I quantum dots are composed of a semiconductor core encapsulated in a second semiconductor material with a larger bandgap, which can passivate non-radiative recombination sites at the surface of the quantum dots and improve quantum yield. Inverse type I quantum dots have a semiconductor layer with a smaller bandgap which leads to ...

  3. Fluorescence intermittency - Wikipedia

    en.wikipedia.org/wiki/Fluorescence_intermittency

    Fluorescence intermittency, or blinking, is the phenomenon of random switching between ON (bright) and OFF (dark) states of the emitter under its continuous excitation. It is a common property of the nanoscale emitters (molecular fluorophores , colloidal quantum dots ) related to the competition between the radiative and non-radiative ...

  4. Photobleaching - Wikipedia

    en.wikipedia.org/wiki/Photobleaching

    Photobleaching: The movie shows photobleaching of a fluorosphere. The movie is accelerated, the whole process happened during 4 minutes. In optics, photobleaching (sometimes termed fading) is the photochemical alteration of a dye or a fluorophore molecule such that it is permanently unable to fluoresce.

  5. Intersystem crossing - Wikipedia

    en.wikipedia.org/wiki/Intersystem_crossing

    Fluorescence microscopy relies upon fluorescent compounds, or fluorophores, in order to image biological systems.Since fluorescence and phosphorescence are competitive methods of relaxation, a fluorophore that undergoes intersystem crossing to the triplet excited state no longer fluoresces and instead remains in the triplet excited state, which has a relatively long lifetime, before ...

  6. Resonance fluorescence - Wikipedia

    en.wikipedia.org/wiki/Resonance_fluorescence

    Resonance fluorescence has been seen in a single self-assembled quantum dot as presented by Muller among others in 2007. [7] In the experiment they used quantum dots that were grown between two mirrors in the cavity. Thus the quantum dot was not placed in the cavity, but instead created in it.

  7. Graphene quantum dot - Wikipedia

    en.wikipedia.org/wiki/Graphene_quantum_dot

    Graphene quantum dots (GQDs) are graphene nanoparticles with a size less than 100 nm. [1] Due to their exceptional properties such as low toxicity, stable photoluminescence , chemical stability and pronounced quantum confinement effect, GQDs are considered as a novel material for biological, opto-electronics, energy and environmental applications.

  8. Photosensitizer - Wikipedia

    en.wikipedia.org/wiki/Photosensitizer

    The results were understood by calculating quantum efficiencies and fluorescent yields at varying wavelengths of light and comparing these results with the yield of reactive oxygen species. However, it was not until the 1960s that the electron donating mechanism was confirmed through various spectroscopic methods including reaction-intermediate ...

  9. Fluorescence - Wikipedia

    en.wikipedia.org/wiki/Fluorescence

    The maximum possible fluorescence quantum yield is 1.0 (100%); each photon absorbed results in a photon emitted. Compounds with quantum yields of 0.10 are still considered quite fluorescent. Another way to define the quantum yield of fluorescence is by the rate of excited state decay:

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