News tagged with phosphorescence
Phosphorescence
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 very slowly in certain materials, absorbed radiation may be re-emitted at a lower intensity for up to several hours after the original excitation.
Commonly seen examples of phosphorescent materials are the glow-in-the-dark toys, paint, and clock dials that glow for some time after being charged with a bright light such as in any normal reading or room light. Typically the glowing then slowly fades out within minutes (or up to a few hours) in a dark room.
The study of phosphorescent materials led to the discovery of radioactivity in 1896.
For more information about Phosphorescence, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
Breaking Kasha's rule: Scientists find unique luminescence in tetrapod nanocrystals
Observation of a scientific rule being broken can sometimes lead to new knowledge and important applications. Such would seem to be the case when scientists with the U.S. Department of Energy (DOE)'s Lawrence ...
Jul 01, 2011 |
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Jewel-toned organic phosphorescent crystals: A new class of light-emitting material
(PhysOrg.com) -- Pure organic compounds that glow in jewel tones could potentially lead to cheaper, more efficient and flexible display screens, among other applications.
Feb 14, 2011 |
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UGA, UPR grant license for long-persistence glow materials, in any color
The University of Georgia Research Foundation, Inc. (UGARF) and the University of Puerto Rico have granted an international, non-exclusive license for a portfolio of glow-in-the-dark pigments that can be designed ...
Aug 17, 2009 |
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New light-emitting biomaterial could improve tumor imaging, study shows
A new material developed at the University of Virginia - an oxygen nanosensor that couples a light-emitting dye with a biopolymer - simplifies the imaging of oxygen-deficient regions of tumors. Such tumors are associated ...
Nanotechnology / Nanomaterials
Aug 10, 2009 |
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Search results for phosphorescence
Quantum dot LEDs get brighter, more efficient
(Phys.org) -- While quantum dot-based light-emitting diodes (QLEDs) are not made of organic materials, they share many of the same advantages as organic LEDs (OLEDs). For instance, both QLEDs and OLEDs outshine ...
Nanotechnology / Nanomaterials
Apr 20, 2012 |
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A possible aid for navigators: Research says microorganisms may create Pacific's 'underwater lightning'
Star charts, compasses, sextants, even dead reckoning. For centuries, sailors have used one or all of those to determine their position on the globe and to help them navigate from one place to another.
Space & Earth / Earth Sciences
Dec 22, 2011 |
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Screens set to go green
Fitting the screens of electronic devices, such as televisions and smartphones, with a new display technology called 'organic light-emitting diodes' (OLEDs) will reduce their energy consumption, but such screens ...
Aug 22, 2011 |
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True blue light emission could make OLED displays the next big thing in consumer electronics
Researchers from Singapore's Institute of Materials Research and Engineering (IMRE) and the University of Michigan have developed a blue organic light emitting diode (OLED) with an efficiency level that is ...
Jun 24, 2011 |
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Learning from plants: visible light energy harvesting
How do they do it? Plants make use of only the energy of sunlight for their requirements. Many researchers are trying to mimic the process to harness the vast energy of the sun. In the article published recently ...
Jun 23, 2011 |
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New fluorescent OLEDs display greater efficiencies than believed possible
(PhysOrg.com) -- University of Michigan engineering researchers have designed an exceptionally efficient fluorescent blue OLED, or organic light emitting diode.
Mar 24, 2011 |
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Contrast agent for tumor diagnostics: Phosphorescent metal-organic coordination polymers for optical imaging
(PhysOrg.com) -- X-rays are not the only way: visible and especially infrared light can also be used to image human tissue. The effectiveness of optical imaging processes can be significantly improved with ...
Nanotechnology / Bio & Medicine
Mar 23, 2011 |
5 / 5 (1) |
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Sensitive to oxygen: Phosphorescent iridium(III) porphyrin complexes, new tunable oxygen indicators
(PhysOrg.com) -- Monitoring the amount of oxygen in living tissues accurately is a valuable tool in biomedical science, because it enables the elucidation of the course of metabolic processes or the detection ...
Mar 09, 2011 |
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New OLETs emit light more efficiently than equivalent OLEDs
(PhysOrg.com) -- Already, organic light-emitting diodes (OLEDs) are becoming commercialized for light display applications due to their advantages such as low fabrication costs and large-area emission. But ...
Nanotechnology / Nanomaterials
May 31, 2010 |
4.9 / 5 (33) |
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Naval research laboratory takes a close look at unique diamonds
The song says that "diamonds are a girl's best friend," but scientists at the Naval Research Laboratory are finding that diamonds are a researcher's best friend too.
Mar 23, 2010 |
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