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Photoluminescence - Wikipedia, the free encyclopedia Photoluminescence is a process in which a chemical compound absorbs a photon with a wavelength in the range of visible electromagnetic radiation, thus transitioning to a higher electronic energy state, and then radiates a photon back out, returning to a lower energy state. The simplest photoluminescent processes are resonant radiations, in which a photon of a particular wavelength is absorbed and an equivalent photon is immediately emitted. An even more specialized form of photoluminescence is phosphorescence, in which the energy from absorbed photons undergoes intersystem crossing into a state of higher spin multiplicity (see term symbol), usually a triplet state. en.wikipedia.org /wiki/Photoluminescence   (371 words)

NREL: Measurements and Characterization - Photoluminescence Spectroscopy   (Site not responding. Last check: 2007-10-21) Photoluminescence spectroscopy is a contactless, nondestructive method of probing the electronic structure of materials. In the case of photo-excitation, this luminescence is called "photoluminescence." The intensity and spectral content of this photoluminescence is a direct measure of various important material properties. The amount of photoluminescence and its dependence on the level of photo-excitation and temperature are directly related to the dominant recombination process. www.nrel.gov /measurements/photo.html   (427 words)

Lunaplast Home "Photoluminescence" is a scientific term that describes the ability of certain minerals to absorb light (especially ultra-violet light) and then re-emit that light in a controlled way over time. While modern photoluminescent products share the same concept as “glow in the dark” products that have been around for decades, they expand the useful visible "afterglow" period from a few minutes to many hours. The reason photoluminescent materials will grow from a tiny niche market to a multi-billion dollar industry over the next few years is simple — PL products are safe, powerful, virtually indestructible and require no additional wiring, electrical power or energy beyond the standard existing lighting in buildings. www.lunaplast.com   (357 words)

FT Photoluminescence in simple terms is a reverse process of absorption. Photoluminescence occurs when an excited electron in an excited state returns to the initial state by emission of a photon whose energy gives the difference between the excited state and the initial state energies. In a direct intrinsic semiconductor, the photoluminescence energy is the optical gap. www.personal.psu.edu /faculty/p/c/pce3/facilities/photolum.htm   (334 words)

Indium Nitride (InN)- Evidence of Narrow Fundamental Band Gap - NSM Archive Photoluminescence spectra of layers with different compositions at T=77 K. The inset shows the semilog photoluminescence spectra of most perfect alloys and the fitting cures of the spectra based on a model interband recombination in degenerated semiconductors. (b) Room-temperature mobility, photoluminescence peak energy (300 and 12 K), and the critical energy determined by PR (77 K) as a function of free-electron concentration n. Photoluminescence peak energy and band gap determined by optical absorption vs composition. www.ioffe.rssi.ru /SVA/NSM/Semicond/InN/dvdv.html   (1167 words)

OhioLINK ETD: Vijh, Uma We present the discovery of a new band of dust PL, blue luminescence (BL) with lambda_{peak} ~ 370 nm in the proto-planetary nebula known as the Red Rectangle (RR). The carrier of the dust-associated photoluminescence process causing the extended red emission (ERE), known now for over twenty five years, remains unidentified. We constrain the character of the ERE carrier by determining the wavelengths of the radiation that initiates the ERE -- lambda < 118 nm. rave.ohiolink.edu /etdc/view?acc_num=toledo1122478565   (314 words)

Photoluminescence Spectroscopy   (Site not responding. Last check: 2007-10-21) They will measure and compare the photoluminescence spectrum of a liquid solution of a semiconducting polymer and the photoluminescence spectrum of a solid film of the same polymer. The unique feature of this experiment is the use of a semiconducting polymer that is soluble in the semiconducting state. In comparison to materials with infra-red bandgaps, use of a di-alkoxy-PPV polymer with a visible electronic bandgap and a visible photoluminescence spectrum make it easier for the students to connect optical concepts to data recorded in the form of a spectrum. www.ee.calpoly.edu /~dbraun/polyelec/PolymerPL.html   (252 words)

CHARACTERIZATION OF HYDROGEN RICH DIAMONDS FROM ARGYLE/ AUSTRALIA WITH VIS/NIR- AND PHOTOLUMINESCENCE- SPECTROSCOPY   (Site not responding. Last check: 2007-10-21) The photoluminescence spectrum of a blue gray diamond from Argyle; the maxima were measured as follows: 1332cm-1 first order Raman, 582.9, 604, 613.3, 625.5, 641, 644.8, 655.2, 668.2, 669.2, 670, 687.9, 689, 694.3, 695, 701.4, 717.5, 728.3, 764nm Chameleon diamonds are generally described as gray-olive-green diamonds which change their color to a more intense olivish-yellow color when they are heated, cooled or sometimes even after storage in the dark for some time. The low temperature photoluminescence spectrum of a classical gray-olive-green chameleon diamond; the positions of the maxima have been measured as being precisely the same as the maxima of the greenish yellow Argyle chameleons. www.gemlab.net /research1_1.htm   (1183 words)

Encyclopedia of Laser Physics and Technology - photoluminescence, fluorescence   (Site not responding. Last check: 2007-10-21) Photoluminescence is the emission of light which is caused by the irradiation of a substance with other light. Photoluminescence is often used in the context of semiconductor devices (e.g. Here, photoluminescence is excited by illumination of the device with light which has a photon energy above the bandgap. www.rp-photonics.com /photoluminescence.html   (245 words)

Caring Medical - Therapies - Photoluminescence The word Photoluminescence sounds mysterious and "hi-tech", but it is an extremely simple, painless and safe means of treating a person for a variety of illnesses. Photoluminescence involves subjecting blood to ultraviolet light to promote healing. Generally, 1.5cc of blood per pound of body weight is withdrawn up to a maximum of 250cc. www.caringmedical.com /therapies/photoluminescence.asp   (940 words)

Photoluminescence and polarized photodetection of single ZnO nanowires Photoluminescence and polarized photodetection of single ZnO nanowires Photoluminescence and photoconductivity measurements show defect-related deep electronic states giving rise to green-red emission and absorption. Photocurrent temporal response shows that current decay time is significantly prolonged in vacuum due to a slower oxygen chemisorption process. repositories.cdlib.org /postprints/269   (153 words)

Diamond-treatments, synthetic diamonds, diamond simulants and their detection   (Site not responding. Last check: 2007-10-21) Photoluminescence detects certain color centers with much more sensitivity than other spectroscopic methods and it is especially useful for synthetic and HPHT treated diamonds. this technique is somewhat similar to Photoluminescence, but instead of a laser beam, an electron beam is being used to excite the optical centres. Fig 21: Photoluminescence spectrum of the 0.24ct vivid greenish yellow princess cut synthetic diamond produced with a nickel catalyst in Russia. www.gemlab.net /publication1.htm   (7139 words)

Photoluminescence Spectroscopy of Quantum Dots - Supplier Data by Horiba Jobin Yvon For example, alloyed CdSeTe QDs are shown herein to possess a nonlinear change in their photoluminescence spectra, correlated to size and composition, as monitored by the versatile Spex Zunger et al suggest the observed effects arise because of: (a) the various ionic sizes in the alloy; (b) the various electronegativities of these ions; and (c) the binary structures of these ions have various lattice constants. Source: “Photoluminescence Spectroscopy of Quantum Dots, monitored by the Spex FluoroMax” - Application note by Horiba Jobin Yvon. www.azonano.com /Details.asp?ArticleID=1358   (718 words)

Photoluminescence Spectroscopy of Quantum Dots monitored by the Spex FluoroMax Photoluminescence Spectroscopy of Quantum Dots monitored by the Spex FluoroMax The QDs' emission wavelength can be as high as 850 nm, which may be useful for imaging deeper into living tissue than visible light can penetrate. A range of alloyed QDs were examined via absorption and photoluminescence spectroscopy (Figure 2). www.jobinyvon.fr /frdivisions/Fluorescence/qdots.htm   (624 words)

photoluminescence   (Site not responding. Last check: 2007-10-21) Longevity Resources Inc. is the industry leader in providing professionals and home users with high quality, professional equipment including UV instruments for photoluminescence. Photoluminescence is the emission of photons from an excited molecular species and is commonly observed with certain semiconductor materials. As an industry leader, we are committed to providing you with exceptional customer service and only quality and safety proven, professional equipment and materials. www.longevityresources.com /photoluminescence.html   (109 words)

Time-resolved photoluminescence spectroscopy of ligand-capped PbS nanocrystals   (Site not responding. Last check: 2007-10-21) The absorption band edge of the PbS nanocrystals is tuned between 900 and 580 nm. The magnitude of the Stokes shift is found to be dependent upon the size of PbS nanocrystals. Time-resolved photoluminescence spectroscopy of the PbS nanocrystals reveals that the photoluminescence has an extraordinarily long lifetime of 1 µs. stacks.iop.org /0957-4484/16/175   (257 words)

Veröffentlichungen K. Thonke "Piezo-Spectroscopic Study of the V3+ Photoluminescence in GaP:V:S" Proceedings of the 18th Int. "Photoluminescence, optical absorption, and EPR studies of the Co^(2+)-S_(P) pair defect in GaP" "Photocurrent and Photoluminescence measurements in the near-band-edge region of 6H GaN " hlhp1.physik.uni-ulm.de /users/kt/thpub.html   (3664 words)

Photoluminescence Forum Because the ultimate responsibility for life safety is shouldered by lighting designers, architects, building owners and fire officials, it is no surprise that there is an ever-increasing interest in the use of photoluminescent products to mark exits and emergency evacuation routes. The Photoluminescence Forum is designed to foster a better understanding of photoluminescent safety products and their applications. After reviewing our current Photoluminescence Forum Topics, you are welcome to submit questions and suggestions for future topics by clicking on the Submit Topic link. www.globritesystem.com /plforum   (103 words)

Characterisation of Semiconductors with Photoluminescence Measurement Systems Photoluminescence is the optical emission obtained by photon excitation (usually a laser) and is commonly observed with III-V semiconductor materials. This type of analysis allows non-destructive characterisation of semiconductors (material composition, qualitative investigations, etc. We identify the position of one or several photoluminescence lines, and with the help of mathematical models, determine the composition of the material. www.jobinyvon.fr /frdivisions/OSD/app_photolum.htm   (208 words)

How does photoluminescence work,radiation and convection,radiation sickness pictures   (Site not responding. Last check: 2007-10-21) How does photoluminescence work,radiation and convection,radiation sickness pictures,where can i get radiation badge,lcd and radiation,lcd emr or radiation,effects radiation pollution,computer radiation levels comment How does photoluminescence work depends entirely on protection from beta radiation, beer and lambert, de beers law, acoustic protection includes protection from dirty bomb,,.Visit How does photoluminescence work resources and best electromagnetic spectrum cool.For those not interested in How does photoluminescence work, we kindly recommend using anti anti radiation missile. This service offers instant prostateradiation cell.We provide How does photoluminescence work in several protection for mobile phone radiation in some of the best pump probe in Old pictures of radiation therapy.Information and resources for How does photoluminescence work how does photoluminescence work, nuclear medicine products includes chemotherapy products,,.View How does photoluminescence work pictures. cell.niza-irbit.ru /how_does_photoluminescence_work   (419 words)

Health and Wellness Foundation - Serving Humanity to educate the public and medical community that Alternative ... The focus of the Foundation has been to research and identify safe and effective alternative methods of disease prevention, treatments and cures. We have identified and successfully tested, proved, and improved the efficacy of Photoluminescence, Oxidative Medicine and delivery systems. For over 100 years Photoluminescence has been referred to by many names in literature, such as UVBI, UV Light Therapy, Photopheresis, Light Therapy and Bio-Photonics. www.fflt.org   (1678 words)

Scanned photoluminescence of semiconductors   (Site not responding. Last check: 2007-10-21) Photoluminescence (PL) scanning is used to assess a number of material- or process-related concerns in semiconductors. Since it is a non-destructive, non-contact technique, it can be used at any stage of the fabrication process. In particular, reselling and systematic downloading of files is prohibited. stacks.iop.org /0268-1242/7/A1   (287 words)

References by Journal   (Site not responding. Last check: 2007-10-21) Photoluminescence study on GaN homoepitaxial layers grown by molecular beam epitaxy Microstructure and photoluminescence of GaN grown on Si(111) by plasma-assisted molecular beam epitaxy Photoluminescence properties of cubic GaN grown on GaAs(100) substrates by metalorganic vapor phase epitaxy nsr.mij.mrs.org /refs/byjournal.html   (11148 words)

[No title] By the summer of 1942, over 6,500 patients had been treated with Photoluminescence Therapy with a greater than 95% success rate, and no harmful side effects. Increase in the oxygen combining power of the blood and oxygen transportation to organs. He goes on to state that Photoluminescence Therapy is performed using FDA approved equipment www.mnwelldir.org /docs/immune/ubi.htm   (1120 words)

Optoelectronics : Photoluminescence High photoluminescence efficiency in polymer containing rare earth Strain Mapping by Measurement of the Degree of Polarization of Photoluminescence Experimental investigation of photoluminescence spectra of Yb^(3+) sensitized Er^(3+)-doped glass samples in series www.opticsinfobase.org /ocisdirectory/250_5230.cfm   (388 words)

HKUST Institutional Repository: Item 1783.1/1444 We have investigated the Raman scattering and the photoluminescence (PL) of ZnS The results of Raman studies show that the ZnS In addition, photoluminescence spectra obtained in backscattering and edge-emission geometries, reflectivity spectra and the temperature dependence of the photoluminescence of ZnS hdl.handle.net /1783.1/1444   (168 words)

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