Shedding Light on Chemistry
Special Issue International Year of Light
Mark WainwrightHow to cite this article
Cationic tricyclic photosensitisers such as the phenothiazinium S137 (shown) are highly effective bacterial killers when activated by the correct wavelength light. Microbial killing by reactive oxygen species such as singlet oxygen (1O2) is unaffected by conventional antimicrobial resistance.
Leonardo de S. Menezes; Cid B. de AraújoHow to cite this article
Raman processes (left) and photoluminescence with energy transfer (right) - both are phonon-assisted optical transitions; the energy levels 1 and 2 are supposed to be thermally coupled. The intensity ratios IS/IAS and I2/I1 allow temperature measurements.
Juliana M. P. Almeida; Gustavo F. B. Almeida; Leonardo Boni; Cleber R. MendonçaHow to cite this article
This review presents results on the nonlinear optical characterization of special glasses, as well as on the achievements obtained on the use of femtosecond laser micromachining for advanced processing of such glasses.
Daiana K. Deda; Koiti ArakiHow to cite this article
Photodynamic therapy (PDT) is based on the combination of nontoxic components (photosensitizer, PS + oxygen) that when activated by low energy light generates cytotoxic species, such as reactive oxygen species (ROS), capable of causing direct damage to biomolecules, triggering tumor cells death. In recent years, the combination of PSs and drug delivery systems is been more extensively explored in order to increase the selectivity and photodynamic efficiency, thus reducing further the side effects of that therapy.
Paulo C. de Sousa Filho; Juliana F. Lima; Osvaldo A. SerraHow to cite this article
This review presents an introduction regarding the spectroscopic properties of rare earth elements and their application in solid state optical devices, with a brief discussion of the main mechanisms of light absorption and emission by 4f elements.
Fábio S. Grasel; Fabiano Barreto; Louise Jank; Valter StefaniHow to cite this article
We present novel ESIPT fluorescent triazinyl-benzazole derivatives. The compounds are photoactive in the blue-orange region with a large Stokes' shift.
Jonatan L. O. Buske; Celso R. Nicoleti; Aluisio A. Cavallaro; Vanderlei G. MachadoHow to cite this article
4-(Pyren-1-ylimino)methylphenol and its silylated derivative were synthesized and employed in F- and CN- colorimetric detection in solution. These compounds were used in two strategies, as a chemosensor based on acid-base or in a chemodosimeter approach.
Maylon M. Martins; Diego S. Silva; Luciana R. P. Kassab; Sidney J. L. Ribeiro; Cid B. de AraújoHow to cite this article
Enhancement of the photoluminescence intensity at ca. 1300 nm attributed to the local field growth in the vicinity of the silver nanoparticles in Bi2O3-GeO2 glasses. This result and the others presented in this work illustrate the large potential of Bi2O3-GeO2 with silver nanoparticles (Ag-NPs) to be used in photonic devices.
Wesley C. Muscelli; Felipe T. Aquino; Sidney J. L. Ribeiro; Rogéria R. GonçalvesHow to cite this article
Emission at 1000 nm generated by UV-Vis to near infrared (NIR) energy conversion from nanocomposite and planar waveguide.
José M. A. Caiut; Younes Messaddeq; Hervé Dexpert; Marc Verelst; Sidney J. L. Ribeiro; Jeannette Dexpert-GhysHow to cite this article
New luminescent asparagine (Asn) modified organic-inorganic hybrid composites based on Tb3+-Al3+ host were obtained. Asn was observed to enhance the host-to-dopant energy transfer.
Lauro J. Q. Maia; Rogéria R. Gonçalves; Anderson S. L. Gomes; Sidney J. L. RibeiroHow to cite this article
The 1 mol% Er3+ doped 80SiO2:20GeO2 have an infrared emission, due to the Er3+ 4I13/2 → 4I13/2 transition, 4.9 times higher than the for 90SiO2:10GeO2.
Carlos R. Matias; Eduardo J. Nassar; Marc Verelst; Lucas A. RochaHow to cite this article
Phosphors arranged in a form of sheets with 60 nm of thickness are excited by the light emission region of a light emitting diode emitting ultraviolet (UV, 275, 394 nm), blue (465 nm) or green (525 nm) light displaying strong and narrow red emission lines at around 614 nm.
Denise M. Zezell; Carolina Benetti; Marcelo N. Veloso; Pedro A. A. Castro; Patricia A. AnaHow to cite this article
Infrared spectra of bone, dentine, and enamel, in which organic and inorganic matrix can be affected by high intensity laser irradiation used in dentistry or by gamma radiation in medicine.
Martha S. Ribeiro; Silvia Cristina Núñez; Caetano P. Sabino; Tania M. Yoshimura; Camila R. Silva; Gessé E. C. Nogueira; Hideo Suzuki; Aguinaldo S. GarcezHow to cite this article
Light-based technology can potentiate the dissemination of phototherapy studies to determine its suitable application in health sciences.
Raquel Alves; Leandro P. Ravaro; Agnieszka Pawlicka; Maria Manuela Silva; Andrea S. S. de CamargoHow to cite this article
Chitosan doped with Eu(CF3SO3)3 presents emissions from blue to red that can be tuned to yield white light. Addition of LiI can lead to electroluminescent devices.
Elias P. Ferreira Neto; Mateus B. Simões; Julia C. Noveletto; Jean M. S. C. Yabarrena; Sajjad Ullah; Ubirajara P. Rodrigues FilhoHow to cite this article
The photochromic response of Ormosil-phosphotungstate hybrid films can be enhanced up to 7 times by doping with alkaline earth metal cation and tailored by varying the matrix composition.
Renata S. Manzan; José P. Donoso; Claudio J. Magon; Igor d'Anciães A. Silva; Christian Rüssel; Marcelo NalinHow to cite this article
Red emission spectra of the glasses with different amounts of MnO (left) and samples 0Mn and 10Mn without irradiation (right, upper) and during irradiation with λ = 408 nm (right, bottom).
Adjaci F. Uchoa; Aaron M. Konopko; Maurício S. BaptistaHow to cite this article
New non-symmetric and positively-charged PDT photosensitizers were obtained by using inexpensive copper-chlorophyllin as raw material and a simple chemical route.
Carime V. Rodrigues; José R. Correa; Carlos M. Aiube; Lorena P. Andrade; Pedro M. Galvão; Pâmela A. Costa; Ariadna L. Campos; Anderson J. Pereira; Grace F. Ghesti; Jorlandio F. Felix; Ingrid T. Weber; Brenno A. Neto; Marcelo O. RodriguesHow to cite this article
Carbon dots (C-dots) have been synthesized from brewing industry waste and applied as bioprobes for live cell-imaging experiments with interesting results.
Ivan G. N. Silva; Danilo Mustafa; Maria C. F. C. Felinto; Wagner M. Faustino; Ercules E. S. Teotonio; Oscar L. Malta; Hermi F. BritoHow to cite this article
Commission Internationale de l'Eclairage (CIE) diagram and photographs [RE(TLA):Eu3+] and RE2O3:Eu3+, excited under UV radiation.
Online version ISSN 1678-4790 Printed version ISSN 0103-5053
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