1. Press the ON button: This will power up the device. 2. Press the START button: This will start a 60 second treatment session. 3. The light will begin to illuminate and the green indicator light above the text “POWER,” will light up. 4. Hold the tip of the head roughly ½ inch, or 1 cm, from the area you wish to treat.
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Examples of Luminescence
Chemoluminescence - This process creates light through a chemical reaction. Common applications are glow sticks (cyalume sticks) and the forensic application for locating blood using luminol.
Examples of Bioluminescence
Bioluminescence is a type of chemoluminescence that is used by living creatures. For example:
Examples of luminescence in a Sentence
Recent Examples on the Web Radiocarbon analysis and luminescence dating established that the modern human layer in Grotte Mandrin is between 51,700 and 56,800 years old. — Tom Metcalfe, NBC News, 9 Feb. 2022 Her engagement ring is almost as dazzling as the mega screens in Times Square that create a daylight-like luminescence long after sunset.
Medical Definition of luminescence
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Sources and process
Luminescence emission occurs after an appropriate material has absorbed energy from a source such as ultraviolet or X-ray radiation, electron beams, chemical reactions, and so on.
Luminescence and incandescence
As mentioned above, luminescence is characterized by electrons undergoing transitions from excited quantum states. The excitation of the luminescent electrons is not connected with appreciable agitations of the atoms that the electrons belong to.
Luminescent pigments and dyes
Nonluminescent pigments and dyes exhibit colours because they absorb white light and reflect that part of the spectrum that is complementary to the absorbed light. A small fraction of the absorbed light is transformed into heat, but no appreciable radiation is produced.
Early investigations
Although lightning, the aurora borealis, and the dim light of glowworms and of fungi have always been known to mankind, the first investigations (1603) of luminescence began with a synthetic material, when Vincenzo Cascariolo, an alchemist and cobbler in Bologna, Italy, heated a mixture of barium sulfate (in the form of barite, heavy spar) and coal; the powder obtained after cooling exhibited a bluish glow at night, and Cascariolo observed that this glow could be restored by exposure of the powder to sunlight.
Phosphorescence and fluorescence
The name luminescence has been accepted for all light phenomena not caused solely by a rise of temperature, but the distinction between the terms phosphorescence and fluorescence is still open to discussion.
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Warnings
Remember that some people have sensory sensitivities and may be affected by fragrance oils.
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