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Fluorescent Materials

Fluorescent Materials. Mrs. L. Fox. What is Fluorescence?. The emission of electromagnetic radiation, especially of visible light, stimulated in a substance by the absorption of incident radiation and persisting only as long as the stimulating radiation is continued. Fluorescent Lamps.

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Fluorescent Materials

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  1. Fluorescent Materials Mrs. L. Fox

  2. What is Fluorescence? • The emission of electromagnetic radiation, especially of visible light, stimulated in a substance by the absorption of incident radiation and persisting only as long as the stimulating radiation is continued.

  3. Fluorescent Lamps • A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp. • Lower energy cost typically offsets the higher initial cost of the lamp. • They are also cooler than incandescent lights

  4. Other Types of Fluorescent Lights

  5. How Does This Type of Light Differ From Regular Light Bulbs? • The main difference between these sources is the process of exciting the atoms. • In an incandescent light source, such as an ordinary light bulb or gas lamp, atoms are excited by heat; in a light stick, atoms are excited by a chemical reaction.

  6. Other Things That Glow • Fluorescent molecules tend to have rigid structures and delocalized electrons. Examples of common materials that MIGHT contain fluorescent molecules include: • White Paper • Petroleum Jelly • US $20 BillModern US $20 bills contain a security strip near one edge that glows bright green under a black light. • Tonic Water

  7. Body Fluids • Vitamins • Chlorophyll • Antifreeze • Laundry DetergentsTooth Whiteners

  8. JellyfishSome Minerals and GemsBanana Spots

  9. Phosphorescence • Is a specific type of photoluminescence related to fluorescence. • It releases the radiation more slowly • Example include: • glow-in-the-dark toys • Paint • clock dials

  10. Triboluminescence • Is an optical phenomenon in which light is generated through the breaking of chemical bonds in a material when it is pulled apart, ripped, scratched, crushed, or rubbed • Examples: • Wintergreen candy • Ripping apart adhesive tapes

  11. Chemiluminescence • Is the emission of light (luminescence), as the result of a chemical reaction. • There may also be limited emission of heat.

  12. Bioluminescence • That light that is emitted from living (or once living) organisms. • This is a type of chemiluminescence. • Examples: • Jellyfish • Some algae (diatoms) • Fluorescent fish

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