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Topic: Phosphorescence

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  Phosphorescence - LoveToKnow 1911
Thus, fluorescence and phosphorescence are included under the same heading, " photoluminescence," being distinguished from each other only by the fact that fluorescent bodies emit their characteristic light only while under the influence of the exciting illumination, while phosphorescent bodies are luminous for an appreciable time after the exciting light is cut off.
Thus the phosphorescent light emitted by calcium sulphide may be orangeyellow, yellow, green or violet, according to the method of preparation and the materials used.
In the females the phosphorescence is probably a sexual lure; in the males its f unction is unknown.
www.1911encyclopedia.org /Phosphorescence   (2794 words)

 phosphorescence - Encyclopedia.com
Phosphorescence is distinguished from fluorescence in that it continues even after the radiation causing it has ceased.
Their phosphorescence, however, is not temperature-related, as ordinary phosphorescence is, and some consider it instead to be a type of fluorescence that dies slowy.
Mixed in the cement is a rare earth doped calcium aluminate phosphorescent pigment that produces a long lasting phosphorescence for up to 8 hours in the visible portion of the spectrum after exposure to a radiation source.
www.encyclopedia.com /doc/1E1-phsphrsc.html   (1137 words)

  PHOSPHORESCENCE - Online Information article about PHOSPHORESCENCE
Probably the phosphorescence of organisms is due to a similar process acting on the many fats, oils and similar sub-stances found in living cells.
Many of the bacteria of putrefaction are phosphorescent, and the light emitted by dead fish or molluscs or flesh is probably due in every case to the presence of these.
Phosphorescent organs known as photophores are characteristic structures in many of the deep-sea Teleostome fishes, and have been developed in widely different families (Stomiatidae, Scopelidae.
encyclopedia.jrank.org /PER_PIG/PHOSPHORESCENCE.html   (3451 words)

 Mineral Gallery - Pleochroism, Phosphorescence and other light effects
Phosphorescence is the ability of a mineral to glow after the initial activating ultraviolet light is removed.
The reason for the delay is because a certain amount of the electrons are prevented from returning to their lower energy states quickly, at least not as quickly as they were initially energized by the UV light.
Some phosphorescent intensity is very low and actually beyond the capabilities of the human eye to detect.
mineral.galleries.com /minerals/property/pleochro.htm   (1020 words)

 Sensitized and Quenched Phosphorescence as a Detection Mode in Capillary Electrophoresis
The potential of sensitized and quenched phosphorescence of biacetyl as an optical detection mode in capillary electrophoresis (CE), complementary to absorption and fluorescence detection, was explored.
The technique is based on the intense phosphorescence emission of biacetyl (present as a constituent of the CE buffer) at room temperature in deoxygenated liquid solutions.
Both phosphorescence modes can be applied at a 0.02 M biacetyl concentration, though in the quenched mode a biacetyl concentration of 0.05 M yields better results.
pubs.acs.org /cgi-bin/abstract.cgi/ancham/1999/71/i07/abs/ac981130h.html   (267 words)

 Phosphorescence Summary
Most emit a blue-green phosphorescence in a region of the electromagnetic spectrum which is highly visible in deep and dark waters.
Marine phosphorescence is an almost ubiquitous phenomenon in the oceans, it helps marine organisms survive by providing them with a means to search for nutrients and defend themselves against predators.
Phosphorescence is a specific type of photoluminescence, related to fluorescence, however unlike fluorescence, a phosphorescent material does not immediately discharge the radiation it absorbs.
www.bookrags.com /Phosphorescence   (1343 words)

 Mineral Resources: Fluorescence and Phosphorescence
The glow slowly fades, and after several seconds (or minutes in a few cases) is no longer visible to the eye.
Only few minerals phosphoresce; phosphorescence is only noted as interesting mineral property, rarely as a diagnostic identification property.
Calcite specimens from Terlingua, Texas fluoresce bluish-white with a strong phosphorescence.
www.minerals.net /resource/property/fluoresc.htm   (489 words)

 Industries and Applications - Honeywell Lumilux Luminescent Pigments
Please note the distinction among the terms luminescence, fluorescence and phosphorescence.
A phosphorescent product continues to emit light after the energy source has been removed.
This is typically referred to as a glow-in-the-dark or afterglow effect.
www.honeywell.com /sites/sm/lumilux/Industries_Apps.htm   (328 words)

A fluorescent paint glows under a UV lamp, but stops glowing as soon as the lamp is turned off.
A phosphorescent paint keeps glowing for a while.
Phosphorescent substances have the ability to store up light and release it gradually.
math.ucr.edu /home/baez/spin/node17.html   (382 words)

 Mineral Gallery - Pleochroism, Phosphorescence and other light effects
Phosphorescence is the ability of a mineral to glow after the initial activating ultraviolet light is removed.
The reason for the delay is because a certain amount of the electrons are prevented from returning to their lower energy states quickly, at least not as quickly as they were initially energized by the UV light.
Some phosphorescent intensity is very low and actually beyond the capabilities of the human eye to detect.
www.galleries.com /minerals/property/pleochro.htm   (1020 words)

 Phosphorescence - The Science of Spectroscopy
Phosphorescence is a luminescent process similar to fluorescence in that it an emission of light by molecules which cannot relax by vibrational relaxation.
The essential differences between the two techniques are that phosphorescence is a slower process, lasting for milliseconds up to several seconds, rather than for only a few microseconds with fluorescence.
The second essential difference is that phosphorescence requires a change of spin of the electron, from a triplet state to the singlet state before it can relax.
www.scienceofspectroscopy.info /edit/index.php?title=Phosphorescence   (293 words)

 Erythrosin B Phosphorescence Monitors Molecular Mobility and Dynamic Site Heterogeneity in Amorphous Sucrose ...
The phosphorescence intensity (lifetime), emission energy, and red-edge excitation effect were all sensitive to localized molecular mobility on the microsecond timescale in the glass and to more global modes of mobility activated at the glass transition.
This study illustrates that phosphorescence from erythrosin B is sensitive both to local dipolar relaxations in the glass as well as more global relaxations in the sucrose melt and provides evidence of the value of phosphorescence as a probe of dynamic site heterogeneity as well as overall molecular mobility in amorphous biomaterials.
Phosphorescence spectroscopy is a sensitive, site-specific method that can be used to detect molecular mobility within the local environment of a triplet probe.
www.findarticles.com /p/articles/mi_qa3938/is_200505/ai_n13636309   (625 words)

 Phosphorescence/Microwave Double-Resonance Spectra of Tryptophan Perturbed by Methylmercury(II) -- Davis and Maki 79 ...
The AM-PMDR spectra accurately represent the phosphorescence of CH Hg(II)-tryptophan.
The AM-PMDR spectrum of the perturbed tryptophan is obtained by microwave pumping of the D + E magnetic resonance signal, which can be observed optically only in the presence of a heavy atom perturbation.
The resulting spectrum is broadened and shifted to the blue relative to the corresponding tryptophan phosphorescence spectrum of the uncomplexed enzyme.
www.pnas.org /cgi/content/abstract/79/14/4313   (261 words)

 Scio :: Ondes :: Phosphorescence
Comme la fluorescence, les atomes phosphorescents "récupèrent" l'énergie des fréquences plus grandes que la lumière qu'ils émettent.
A force de chocs entre atomes, ils se désexcitent tout doucement, et atterrissent en douceur sur l'orbitale qui produit la phosphorescence.
Mais la phosphorescence est surtout utile parce que c'est grâce à elle que les laser marchent.
www.e-scio.net /ondes/phospho.php3   (311 words)

 Definition of phosphorescence - Merriam-Webster Online Dictionary
Learn more about "phosphorescence" and related topics at Britannica.com
Find more about "phosphorescence" instantly with Live Search
See a map of "phosphorescence" in the Visual Thesaurus
www.m-w.com /cgi-bin/dictionary?book=Dictionary&va=phosphorescence   (62 words)

 CD Baby: ALYS HOWE: phosphorescence
Alys is an incredibly gifted musician, and the fact that she has dedicated her life to music is clearly evident in her work.
Alys Howe's CD, Phosphorescence, is an absolutely delightful recording, with dazzling harp playing, innovative arrangements and some of Alys's wonderful original compositions.
Her clear, lovely voice is also featured on a couple of tracks, such as "Ca' the Yowes", and there are also tracks with other instruments.
www.cdbaby.com /cd/alyshowe   (1669 words)

 ZEOLITE AS A SPECTROSCOPIC MATRIX   (Site not responding. Last check: )
Although very early reports of phosphorescence from dye molecules used a solid gel as the matrix, low temperature organic solvent glasses have been the primary choice for observation of phosphorescence from organic molecules.
Intense phosphorescence is observed for a wide range of different organic guests such as anthracene, acenaphthene, phenanthrene, chrysene, fluoranthene, pyrene, and 1,2,3,6,7,8-hexahydropyrene when included in Tl+-exchanged faujasites.
The ability to record phosphorescence from stilbenes even at 298 K is significant as only very weak phosphorescence from trans-stilbene and several substituted trans-stilbenes have been recorded at 77 K in organic glass containing ethyl iodide as the heavy atom perturber.
www.tulane.edu /~murthy/article2.html   (4024 words)

 facts about ocean phosphorescence at Red Cedar
“Ocean “phosphorescence”, commonly seen at night when the water is disturbed, is largely due to the dinoflagellates; they occur ubiquitously in the oceans as planktonic forms, responding to mechanical stimulation when the water is disturbed by emitting brief bright light.
Phosphorescent bays (e.g., in Puerto Rico, Jamaica) are persistent blooms of this type.
Since dinoflagellates are stimulated to emit light when predators (e.g., crustaceans) are active, predators on the crustaceans might thereby be alerted to feed on crustaceans, resulting in a reduced predation on dinoflagellates generally.
red-cedar.ca /?p=400   (309 words)

 Erythrosin B Phosphorescence Monitors Molecular Mobility and Dynamic Site Heterogeneity in Amorphous Sucrose -- ...
) of the phosphorescence emission spectra with excitation at 530 and 560 nm is plotted versus temperature.
The phosphorescence emission of erythrosin in amorphous sucrose
Phosphorescence and fluorescence characterization of fluorescein derivatives immobilized in various polymer matrices.
www.biophysj.org /cgi/content/full/88/5/3551   (5556 words)

 Light-Induced Retinal Vascular Damage by Pd-porphyrin Luminescent Oxygen Probes -- Stepinac et al. 46 (3): 956 -- ...
Phosphorescence lifetime images of PdTCPP in two vessels of the ONH of eye 3 calculated after the modulation as a function of the elapsed time since the beginning of the irradiation.
The average phosphorescence lifetime calculated on the whole image and the elapsed time since the beginning of illumination is at the top of each image.
The values of the phosphorescence lifetime are the average between the "phase" lifetime and the "modulation" lifetime obtained with the FD-PLIM instrument.
www.iovs.org /cgi/content/full/46/3/956   (5133 words)

 Phosphorescence , Ethical, Eco Friendly, Eco Chic Products at EcoCentric   (Site not responding. Last check: )
Designed by Oliver Heath these phosphorescence lights are the low energy fairy lights of the future. Made with colour changing LED's they give a soft, sparkly glow and are great for creating atmosphere.
The lights come with a simple control box that allows you to choose both the colour of the lights and the speed of change. Sit back and watch as the colour moves from blue, to purple, to red, to green.
Phosphorescence can be used in lots of ways - bunched together, strung out infront of a mirror, placed in a frosted vase or simply concealed behind objects or furniture to produce a soft glow. They are designed to stimulate the imagination and relax the mind!
www.ecocentric.co.uk /acatalog/EcoCentric_Store_Phosphorescence_104.html   (189 words)

Thus, phosphorescence is usually emitted over periods of microseconds to seconds compared to nanoseconds for fluorescence.
Thus, phosphorescence is normally a very inefficient process in solution and is usually only important for molecules that have some sort of protection against quenching processes.
'Phosphorescence' tends to be used to describe any long-lived emission, for example the glow emitted by phosphorus as it oxidises in air (this is actually chemiluminescence).
www.prsbio.com /html/faq.html   (8919 words)

 Microvascular and interstitial PO2 measurements in rat skeletal muscle by phosphorescence quenching -- Shibata et al. ...
In a previous study (29), we reported on the development of a fluorescence intravital microscope equipped with a laser illuminator.
Phosphorescence emission was captured by a photomultiplier through a long-pass filter at 610 nm, and signals from the photomultiplier were converted to 10-bit digital signals at intervals of 3 µs.
Phosphorescence lifetime analysis with a quadratic programming algorithm for determining quencher distribution in heterogeneous system.
jap.physiology.org /cgi/content/full/91/1/321   (3890 words)

 Phosphorescence and Fluorescence
The two phenomena of fluorescence and phosphorescence are not as common as simple reflection and transmission, but do have an important part to play in the complete description of macroscopic physical behavior that should be modeled by image synthesis programs.
The hands are painted with a phosphorescent ink, which absorbs light when illuminated and then radiates that light back out (note that gamma setting on your monitor may make these pictures darker than they should be).
An interesting result is that the famous parallelism exploited by many ray tracing programs is not inherent in the algorithm, but comes from simplicifation of the physics, which is precisely the eilmination of phosphorescent and fluorescent effects.
www.glassner.com /andrew/cg/research/fluphos/fluphos.htm   (697 words)

 Phosphorescence and Florescence Distinction   (Site not responding. Last check: )
Phosphorescence is slow -- of the order of seconds to minutes or even hours.
Vince Calder ==================================================================== Hari, The simplest demonstration of the difference between fluorescence and phosphorescence is to look at a fl light poster (under fl light) and to look at anything that's "glow in the dark" (like those star stickers you put on ceilings or the hands on a watch).
Things that phosphoresce "glow" for much longer because the excited electrons take so much longer to come back down to their initial energies.
www.newton.dep.anl.gov /askasci/chem03/chem03595.htm   (405 words)

 Fluorescence and Phosphorescence
This kind of effect is called the phosphorescence.
Scientists noticed the phenomenon long before the quantum model of the atom was developed, but just that model let the phenomenon be explained.
The phosphorescence is the some time long glowing of a body after it has absorbed electromagnetic radiation.
library.advanced.org /28383/nowe_teksty/htmla/1_21a.html   (568 words)

 Phosphorescence Magazine's Storefront - Lulu.com
Phosphorescence Magazine - Premiere Issue 2007Phosphorescence Magazine - Premiere Issue 2007 (book)
Phosphorescence Magazine is a new magazine that promotes unity through art.
Over 40 artists are profiled in this, the premiere issue, from all levels of experience, and many different genres.
stores.lulu.com /PhosphorescenceMagazine   (87 words)

 PTI TimeMaster System Options: T-1, Q-4, T-3   (Site not responding. Last check: )
In order to extend the measurable lifetime range into the microsecond to seconds range we have added the options for measuring phosphorescence lifetimes.
While some of these options include steady state capability it is important to note that for high sensitivity in these types of measurements a continuous illumination source is preferred.
Extended phosphorescence detection option for fluorescence lifetime systems (for lifetimes beyond 500 nanoseconds), adds gated detector with 1527 PMT to second exit channel of emission monochromator, detector selection by means of flipping mirror.
www.pti-nj.com /TM_options_phos.html   (139 words)

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