Relevant bibliographies by topics / Luminescence

Academic literature on the topic 'Luminescence'

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Published: 4 June 2021
Last updated: 31 July 2024

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Journal articles on the topic "Luminescence"

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Fritzen, Douglas L., Luidgi Giordano, Lucas C. V. Rodrigues, and Jorge H. S. K. Monteiro. "Opportunities for Persistent Luminescent Nanoparticles in Luminescence Imaging of Biological Systems and Photodynamic Therapy." Nanomaterials 10, no. 10 (October 13, 2020): 2015. http://dx.doi.org/10.3390/nano10102015.

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The use of luminescence in biological systems allows us to diagnose diseases and understand cellular processes. Persistent luminescent materials have emerged as an attractive system for application in luminescence imaging of biological systems; the afterglow emission grants background-free luminescence imaging, there is no need for continuous excitation to avoid tissue and cell damage due to the continuous light exposure, and they also circumvent the depth penetration issue caused by excitation in the UV-Vis. This review aims to provide a background in luminescence imaging of biological systems, persistent luminescence, and synthetic methods for obtaining persistent luminescent materials, and discuss selected examples of recent literature on the applications of persistent luminescent materials in luminescence imaging of biological systems and photodynamic therapy. Finally, the challenges and future directions, pointing to the development of compounds capable of executing multiple functions and light in regions where tissues and cells have low absorption, will be discussed.
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Claes, Julien M., Steven H. D. Haddock, Constance Coubris, and Jérôme Mallefet. "Systematic Distribution of Bioluminescence in Marine Animals: A Species-Level Inventory." Life 14, no. 4 (March 24, 2024): 432. http://dx.doi.org/10.3390/life14040432.

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Bioluminescence is the production of visible light by an organism. This phenomenon is particularly widespread in marine animals, especially in the deep sea. While the luminescent status of numerous marine animals has been recently clarified thanks to advancements in deep-sea exploration technologies and phylogenetics, that of others has become more obscure due to dramatic changes in systematics (themselves triggered by molecular phylogenies). Here, we combined a comprehensive literature review with unpublished data to establish a catalogue of marine luminescent animals. Inventoried animals were identified to species level in over 97% of the cases and were associated with a score reflecting the robustness of their luminescence record. While luminescence capability has been established in 695 genera of marine animals, luminescence reports from 99 additional genera need further confirmation. Altogether, these luminescent and potentially luminescent genera encompass 9405 species, of which 2781 are luminescent, 136 are potentially luminescent (e.g., suggested luminescence in those species needs further confirmation), 99 are non-luminescent, and 6389 have an unknown luminescent status. Comparative analyses reveal new insights into the occurrence of luminescence among marine animal groups and highlight promising research areas. This work will provide a solid foundation for future studies related to the field of marine bioluminescence.
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Shvalagin, Vitaliy, Galyna Grodziuk, Olha Sarapulova, Misha Kurmach, Vasyl Granchak, and Valentyn Sherstiuk. "Influence of Nanosized Silicon Oxide on the Luminescent Properties of ZnO Nanoparticles." Journal of Nanotechnology 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/2708638.

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For practical use of nanosized zinc oxide as the phosphor its luminescence quantum yields should be maximized. The aim of this work was to enhance luminescent properties of ZnO nanoparticles and obtain high-luminescent ZnO/SiO2composites using simpler approaches to colloidal synthesis. The luminescence intensity of zinc oxide nanoparticles was increased about 3 times by addition of silica nanocrystals to the source solutions during the synthesis of ZnO nanoparticles. Then the quantum yield of luminescence of the obtained ZnO/SiO2composites is more than 30%. Such an impact of silica is suggested to be caused by the distribution of ZnO nanocrystals on the surface of silica, which reduces the probability of separation of photogenerated charges between the zinc oxide nanoparticles of different sizes, and as a consequence, there is a significant increase of the luminescence intensity of ZnO nanoparticles. This way of increasing nano-ZnO luminescence intensity facilitates its use in a variety of devices, including optical ultraviolet and visible screens, luminescent markers, antibacterial coatings, luminescent solar concentrators, luminescent inks for security printing, and food packaging with abilities of informing consumers about the quality and safety of the packaged product.
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Мирочник, А. Г., Е. В. Федоренко, and А. Ю. Белолипцев. "Люминесценция дитолуоилметаната дифторида бора. Образование J-агрегатов." Оптика и спектроскопия 130, no. 2 (2022): 237. http://dx.doi.org/10.21883/os.2022.02.52006.1717-21.

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The processes of the formation of J-aggregates during the dissolution 2,2-difluoro-4,6-di(4’-methylphenyl)-1,3,2-dioxaborine crystals (1) and their subsequent dissociation have been studied by absorption and luminescence spectroscopy and quantum-chemical modeling. It is shown that two luminescent centers are observed in the solution 1: monomeric luminescence and luminescence of J-aggregates (dual luminescence). Evolution of absorption, luminescence excitation and luminescence spectra is observed over time, indicating a slow dissociation of J-aggregates.
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Kondo, Mizuho, Yuya Morita, and Nobuhiro Kawatsuki. "Blue-Shifting Mechanofluorochromic Luminescent Behavior of Polymer Composite Films Using Gelable Mechanoresponsive Compound." Crystals 11, no. 8 (August 15, 2021): 950. http://dx.doi.org/10.3390/cryst11080950.

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Mechanochromic luminescent dyes change their luminescence color upon exposure to external mechanical stimuli. In this study, we synthesized a liquid crystalline mechanochromic luminescent dye containing a terminal cholesterol molecule. The dissolution of the dye in 1,4-dioxane resulted in the formation of a gel. The luminescence of the xerogel obtained from the dioxane solution changed from green to blue upon grinding, indicating mechanochromic luminescence behavior. The anisotropic patterning of short-wavelength-shifted luminescence color change by directional handwriting on surface layer of liquid crystal was successfully demonstrated. Furthermore, blue-shifting mechanoresponsive polymer composite surface was fabricated by using the luminophore.
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Tai, Xi Shi. "Preparation and Luminescence Properties of Two Novel Magnesium Complex Materials." Advanced Materials Research 321 (August 2011): 121–24. http://dx.doi.org/10.4028/www.scientific.net/amr.321.121.

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In order to prepare efficient luminescence material, two kinds of novel magnesium luminescence materials were synthesized by the reaction of magnesium chloride with 2-acetyl-1-naphthol-diethylenetriamine (1) and 2-acetyl-1-naphthol-triethylenetetramine (2), respectively. The luminescent properties of two novel magnesium luminescence materials were investigated in solid and in DMSO solutions. The results show that two magnesium luminescence materials have high blue. The DMSO solvent could enhance the luminescence of complex (1), and also quench the luminescence of complex (2).
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Mirochnik A. G., Fedorenko E.V., and Beloliptsev A. Yu. "Luminescence of boron difluoride ditoluoylmethanate. Formation of J-aggregatess." Optics and Spectroscopy 132, no. 2 (2022): 236. http://dx.doi.org/10.21883/eos.2022.02.53212.1717-21.

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The processes of the formation of J-aggregates during the dissolution 2,2-difluoro-4,6-di(4'-methylphenyl)-1,3,2-dioxaborine crystals ( 1) and their subsequent dissociation have been studied by absorption and luminescence spectroscopy and quantum-chemical modeling. It is shown that two luminescent centers are observed in the solution 1: monomeric luminescence and luminescence of J-aggregates (dual luminescence). Evolution of absorption, excitation and luminescence spectra is observed over time, indicating a slow dissociation of J-aggregates. Keywords: luminescence, absorption spectra, boron difluoride complexes, J-aggregates.
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Chinweike Unoma Dokubo, Bright Obidinma Uba, Chisom Precious Nnubia, and Ifeanyi Patience Akaun. "Evaluation of toxicity and resistant effects of heavy metals and antibiotics on the growth of marine bioluminescent bacteria." International Journal of Frontline Research in Science and Technology 1, no. 2 (December 30, 2022): 030–37. http://dx.doi.org/10.56355/ijfrst.2022.1.2.0041.

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Luminescence is the emission of light by an object. Living organisms including certain bacteria are capable of luminescence. Bacteria are the most abundant luminescent organisms in nature. Bacterial luminescence has been studied most extensively in several marine bacteria. Bacterial luminescence is due to the action of the enzyme called luciferase. The luminescent bacteria exist in nature either as free-living bacteria or in symbiotic association with certain marine organisms. Research on luminescent bacteria has always been a fascinating one. In the present study, ten free living luminescent bacteria initially isolated from marine origin were characterized for their tolerance to heavy metals and antibiotics. Copper, zinc, cobalt and cadmium metals at 1 mg/mL concentration have inhibited the growth and luminescence of the all strains except strains 1, 2 and 7. Surprisingly, lead metal at the same concentration dd not inhibit any of the ten strains. However, at 2 mg/mL concentration, similar trend was observed on the growth and luminescence of all the 10 strains. Also, all the tested isolates were sensitive (1 cm >) to all Gram negative and positive antibiotics being tested except isolates 3, 6 and 8, respectively which were resistant (0 – 0.9 cm) to all the antibiotics tested. Thus, the strains isolated from the different sample types have good beneficial potentials such as heavy metal tolerance and antibiotic sensitivity.
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Sami, Hussain, Osama Younis, Yui Maruoka, Kenta Yamaguchi, Kumar Siddhant, Kyohei Hisano, and Osamu Tsutsumi. "Negative Thermal Quenching of Photoluminescence from Liquid-Crystalline Molecules in Condensed Phases." Crystals 11, no. 12 (December 13, 2021): 1555. http://dx.doi.org/10.3390/cryst11121555.

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The luminescence of materials in condensed phases is affected by not only their molecular structures but also their aggregated structures. In this study, we designed new liquid-crystalline luminescent materials based on biphenylacetylene with a bulky trimethylsilyl terminal group and a flexible alkoxy chain. The luminescence properties of the prepared materials were evaluated, with a particular focus on the effects of phase transitions, which cause changes in the aggregated structures. The length of the flexible chain had no effect on the luminescence in solution. However, in crystals, the luminescence spectral shape depended on the chain length because varying the chain length altered the crystal structure. Interestingly, negative thermal quenching of the luminescence from these materials was observed in condensed phases, with the isotropic phase obtained at high temperatures exhibiting a considerable increase in luminescence intensity. This thermal enhancement of the luminescence suggests that the less- or nonemissive aggregates formed in crystals are dissociated in the isotropic phase. These findings can contribute toward the development of new material design concepts for useful luminescent materials at high temperatures.
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Mar’ina, Ul’ana A., Viktor A. Vorob’ev, and Alexandr P. Mar’in. "IR luminescence of CaGa 2O 4 : Yb 3+ excited by 940 and 980 nm radiation." Modern Electronic Materials 6, no. 1 (March 30, 2020): 31–36. http://dx.doi.org/10.3897/j.moem.6.1.55165.

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Existing calcium gallate CaGa2O4 based luminescent materials radiating in visible IR region have been reviewed. IR luminophores have been studied but slightly but their practical implementation is of interest. CaGa2O4 specimens activated with Yb3+ rare-earth ions have been synthesized using the solid-state method. The structure and luminescent properties of CaGa2O4 : Yb3+ have been studied. CaGa2O4 : Yb3+ excitation with 940 and 980 nm radiation generates luminescence in the 980–1100 nm region. Data on the electron level structure in Yb3+ ions suggest that the excitation and luminescence occur directly in the Yb3+ ions with only a passive role of the base lattice. The luminescence spectra contain three peaks at 993, 1025 and 1080 nm. These luminescence peaks are caused by electron optical transitions from excited to main state in Yb3+ ions. 993 nm band luminescence intensity has been studied as a function of Yb3+ activator ions concentration. Introduction of Na+ ions into the luminophore increases IR luminescence intensity. Optimum (Ca1-x-yYbxNay)Ga2O4 luminophore composition has been suggested at which the 993 nm luminescence intensity is the highest.
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Dissertations / Theses on the topic "Luminescence"

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Monteiro, Jorge Henrique Santos Klier 1985. "Propriedades fotofísicas de complexos de íons lantanídeos no estado sólido e em solução aquosa : imageamento e atividade citotóxica." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/250268.

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Orientadores: Fernando Aparecido Sigoli, André Luiz Barboza Formiga
Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Química
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Resumo: Neste trabalho sintetizaram-se os ligantes 4-azidadipicolinato (dipicN3), 4-aminodipicolinato (dipicNH2) e 4-aminopiridina-bis(oxazolina) (pyboxNH2), bem como seus complexos com íons lantanídeos(III) solúveis em água. Sintetizaram-se também complexos insolúveis em água, contendo ligantes derivados dos ácidos benzóico, fenilselenínico e fenilfosfínico. A coordenação dos complexos foi verificada utilizando espectroscopia de absorção no infravermelho, enquanto que a estequiometria dos complexos foi confirmada utilizando análise elementar de carbono e hidrogênio, titulação complexométrica, espectrometria de massas e 1H-RMN. Também foram obtidas as estruturas de alguns complexos por difração de raios X de monocristal. Com os complexos análogos de gadolínio(III) foram obtidos os espectros de fosforescência do ligante a ?77 K com resolução temporal para determinação da energia do nível tripleto, a qual foi obtida pelo método da tangente ou da transição 0-0 fônon. Os complexos de európio(III) foram classificados, comparativamente, em função da simetria pontual, utilizando os espectros de emissão, parâmetros de intensidade de Judd-Ofelt e razão assimétrica, e também em função do grau de covalência da ligação Eu ¿ O, obtido pelo baricentro da transição 5D0 ? 7F0. Foi também medido o tempo de vida de emissão e o rendimento quântico dos complexos contendo os íons európio(III) ou térbio(III). As geometrias do estado fundamental foram determinadas utilizando o método Sparkle/PM3, sendo assim possível explicar alguns dos resultados experimentais obtidos, tal como a alta eficiência de sensitização de alguns complexos. Os complexos de európio(III) e térbio(III) com os ligantes dipicN3, dipicNH2 e pyboxNH2 apresentaram luminescência em solução aquosa, tempo de vida > 1 ms e rendimento quântico na faixa 15 ¿ 40 %, qualificando-os como marcadores luminescentes em sistemas biológicos. Os ligantes e seus complexos tiveram suas citotoxicidades testadas contra células normais (NIH/3T3) e células neoplásicas (NG97, câncer de cérebro e PANC1, câncer de pâncreas). Somente os complexos apresentaram atividade citotóxica e esta é seletiva para células NG97 e PANC1. O complexo K3[Eu(dipicNH2)3] foi capaz de atravessar a barreira hemato-encefálica e foi utilizado como marcador luminescente para células NG97 e PANC1
Abstract: Water-soluble lanthanide complexes with the ligands 4-azidodipicolinate (dipicN3), 4-aminodipicolinate (dipicNH2) and 4-aminopyridine bis-oxazoline (pyboxNH2) were synthesized, a long with water-insoluble lanthanide complexes with ligands derived from benzoic, phenylseleninic or phenylphosphinic acids. The coordination modes of the carboxylic ligands were verified by FT-IR. The stoichiometries of the complexes were confirmed by carbon and hydrogen elemental analysis, complexometric titration and mass spectrometry. The crystal structures of some complexes were determined by single crystal X-ray diffraction. The time-resolved phosphorescence spectra of the ligands were obtained at ?77 K using the gadolinium(III) analogs complexes in order to obtain the energies of triplet levels. The triplet energies were determined by the tangent method or the 0-0 phonon transition. The europium(III) complexes were classified, comparatively, as a function of the point symmetry, using the emission spectra, Judd-Ofelt intensity parameters and the asymmetric ratio, and as a function of the Eu ¿ O bond covalence degree, obtained from the centroid of the 5D0 ? 7F0 transition. The emission lifetimes and quantum yields for the europium(III) and terbium(III) complexes were also determined. The ground state geometries were calculated using the Sparkle/PM3 method and were used to explain some of the experimental results such as the high sensitization efficiency of some complexes. The europium(III) and terbium(III) complexes with the ligands dipicN3, dipicNH2 and pyboxNH2 showed luminescence in water, emission lifetimes > 1 ms and quantum yields in the range 15 ¿ 40 %, qualifying them as potential luminescent markers for biological systems. Cytotoxic assays using the ligands and their complexes against normal cells (NIH/3T3) and neoplastic cells (NG97, brain¿s cancer and PANC1, pancreatic cancer) were performed. Only the complexes showed selective cytotoxicity against NG97 and PANC1 cells. The complex K3[Eu(dipicNH2)3] was able to cross a simulated blood-brain barrier and was also used as a luminescent marker for NG97 and PANC1 cells
Doutorado
Quimica Inorganica
Doutor em Ciências
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Werts, Martinus Henricus Valentinus. "Luminescent lanthanide complexes visible light sensitised red and near-infrared luminescence /." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2000. http://dare.uva.nl/document/83075.

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Macario, Leilane Roberta [UNESP]. "Efeito das terras raras nas propriedades óticas do BaM'O.IND.3'(M==Zr, Ti)." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/97886.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
A necessidade de materiais com emissão luminescente tem aumentado continuamente com o desenvolvimento tecnológico. Para isto, torna-se necessária a obtenção de novos materiais, a fim de acompanhar esta crescente demanda. A criação de novos dispositivos depende, em geral, da obtenção de materiais que possam ser sintetizados, sem que haja a necessidade de utilização de condições especiais de síntese. Com isso, neste trabalho foram obtidas estruturas cristalinas de titanatos e zirconatos de bário dopados com a terra rara európio (Eu) por intermédio do método Hidrotérmico Assistido por Micro-ondas (HAM). Foram utilizadas as técnicas de caracterização, Difração de Raios X (DRX), Microscopia Eletrônica de Varredura (MEV), Espectroscopia Raman (FT-Raman), Espectroscopia de Reflectância no Ultravioleta e Visível (UV-Vis) e Fotoluminescência (FL), com intuito de verificar a influência do dopante Eu sobre as características ópticas e estruturais nos materiais. Assim, foi realizado um estudo correlacionando as técnicas de caracterização que permitiram uma avaliação das propriedades fotoluminescentes e da organização estrutural destes materiais. Os espectros de DRX mostraram que ambos os compostos podem ser obtidos, na fase cristalina a partir de um minuto de tratamento em HAM, sendo o zirconato de bário (BZ) de fase cúbica e o titanato de bário (BT) de fase tetragonal. A espectroscopia Raman foi uma ferramenta importante para caracterizar os compostos a curta distância de acordo com os tempos de síntese das amostras e da concentração de Eu. Por intermédio das medidas de UV-Vis verificou-se a presença de estados intermediários na região do “gap” gerados por defeitos estruturais nos compostos e a inserção dos íons Eu3+ nas redes cristalinas de BZ e BT. Os materiais sintetizados quando excitados em 350,7 nm apresentaram emissões de banda larga na região...
The need for materials with luminescence increases with technological development, which grows every day. For this, it becomes necessary the obtention of new materials in order to follow this growing demand. The creation of new devices depends, in general, from obtaining materials that can be synthesized without the need to use special conditions of synthesis. Thus, in this work crystal structures of barium titanate and barium zirconate doped with rare earth europium (Eu) were obtained through the hydrothermal method assisted by microwave (HAM). The characterization techniques used were X-Ray Diffraction (XRD), Scanning Electron Microscopy (EMS), Raman Spectroscopy (FT-Raman), Reflectance Spectroscopy on Ultraviolet and Visible (UV-Vis) and Photoluminescence (FL), in order to verify the influence of doping on the synthesized materials. Thus, a study correlating the characterization techniques that have allowed an evaluation of the photoluminescent properties and structural organization of these materials was necessary. XRD spectra showed that both materials can be obtained in crystalline phase from one minute of treatment on HAM, giving barium zirconate (BZ) in cubic phase and barium titanate (BT) in tetragonal phase. Raman spectroscopy has been an important tool to characterize the compounds in short distance according to the time of synthesis and Eu concentrations. By means of UV-Vis measurements the presence of intermediate states were observed in the region of gap generated by structural defects in the compounds and the insertion of Eu3+ ions in the crystalline lattice of BZ and BT. The synthesized materials, when excited at 350.7 nm, showed a broadband emission in the visible region, with a variation of intensity of broad bands relative to the luminescence of the matrices by varying the concentration of Eu3+, as well as intensity variations on emissions from the rare earth in question... (Complete abstract click electronic access below)
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Kallir, Alan J. "Total luminescence spectroscopy /." [S.l.] : [s.n.], 1986. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=7960.

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Xu, Jin. "Luminescence in ZnO." VCU Scholars Compass, 2004. http://hdl.handle.net/10156/1444.

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Fox, D. B. "Sensing WIT luminescence." Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246538.

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Scholefield, Roger. "Luminescence of quartz /." Title page, contents and summary only, 1994. http://web4.library.adelaide.edu.au/theses/09SM/09sms3678.pdf.

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Alves, Raphael Henrique de Carvalho. "Aplicação da técnica de luminescência opticamente estimulada em fototerapia para determinar a energia entregue em meios iluminados com laser ou LED nas faixas do vermelho e infravermelho." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-16012017-110450/.

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Alguns ramos da Medicina vêm empregando lasers ou LEDs de baixa potência em diversas especialidades. Estes lasers e LEDs são classificados como luz de baixa potência (LBP) e são usados na área de Fototerapia com comprimentos de onda na faixa do vermelho e do infravermelho. Por outro lado, a área de dosimetria utiliza dispositivos (dosímetros) capazes de estimar a energia depositada devido a exposição prévia à radiação ionizante usando luz visível como estímulo para obtenção de um sinal luminoso - esta técnica é a luminescência opticamente estimulada (OSL). O objetivo deste trabalho é avaliar a possibilidade de estimar a energia entregue por iluminação com laser e LED de baixas potências com comprimentos de onda na faixa do vermelho e infravermelho, utilizados na Fototerapia, empregando a dosimetria OSL. Foram empregados dosímetros de óxido de alumínio, óxido de berílio e fluorita natural, irradiados previamente com radiação beta (dose absorvida de aproximadamente 50 mGy), e iluminados com laser de 658 nm ou LED de 870 nm. Utilizamos o laser com potências de 10, 20, 50 e 100 mW, na faixa de energias de 0,1 a 13,2 J, e os LEDs com potências de 14,5, 58,0 e 130,5 mW, com faixa de energia entre 0,2 e 23,5 J. Para a medida de OSL foi utilizado o leitor TL/OSL Risø (modelo TL/OSL-DA-20) no modo de leitura CW-OSL e estimulo com LED de luz azul de 72 mW. A análise das curvas de emissão OSL foi feita observando tendências na modificação do sinal inicial OSL (integrado no primeiro 1s de leitura) e no sinal OSL total (integrado em 100 s) normalizados por sinal OSL obtido para irradiação padronizada. Os resultados obtidos mostraram que a iluminação com laser de 658 nm reduz o sinal OSL das amostras de óxido de alumínio para energias entre ~0,1 e ~12 J, e o sinal OSL de fluorita em uma faixa de energias mais baixa, entre ~0,1 e ~4 J. Para a iluminação com LED de 870 nm somente as amostras de fluorita mostraram redução do sinal OSL, no intervalo de ~0,1 e ~15 J de energia luminosa incidente; essa mudança foi mais acentuada para o sinal inicial da curva OSL do que para o sinal integrado. As mudanças observadas são independentes das potências luminosas empregadas. As amostras de óxido de berílio não mostraram mudanças na emissão OSL para nenhum dos feixes de luz no intervalo de energia utilizados. Além destes resultados também foi observado que a iluminação com diferentes energias luminosas incidentes nas amostras muda o formato das curvas de emissão OSL das amostras de fluorita: o tempo característico de decaimento das curvas de emissão cresce à medida que mais energia luminosa (infravermelho) é depositada nas amostras. Os resultados mostraram que a técnica OSL poderia ser utilizada para a avaliar de energia luminosa incidente no óxido de alumínio, iluminado com laser de 658 nm, e na fluorita natural, iluminada com LED de 870 nm. Para a fluorita, a mudança nas curvas de emissão OSL das amostras também pode estar relacionada com a energia luminosa incidente nela, fato que deverá ser mais bem estudado em trabalhos posteriores.
Some branches of Medicine are using low power lasers and LEDs in various specialties. These devices are classified as low-power or low-level lasers and LEDs and they are used in phototherapy in the red and infrared wavelength range. On the other hand, in dosimetry some devices (dosimeters) are used to estimate the deposited energy due to a previous exposure to ionizing radiation through a visible light stimulus to get a light signal - this technique is the optically stimulated luminescence (OSL). The objective of this study is to evaluate the possibility of assessing the energy delivered by illumination with laser and LED in the red and infrared wavelength ranges, used in the phototherapy, using the OSL technique. OSL dosimeters of aluminum oxide, beryllium oxide and natural fluorite were used. They were previously exposed to beta radiation (absorbed dose of about 50 mGy) and illuminated with 658 nm laser or 870 nm LED. The laser powers were 10, 20, 50 and 100 mW, and the light energy was in the range 0.1 to 13.2 J; and the chosen LED powers were 14.5, 58.0, 130.5 mW, delivering energies in the range 0.2 to 23.5 J. The OSL emission curves were measured with the TL/OSL Risø (TL/OSL-DA-20 model), CW-OSL mode, stimulating light provided by blue LEDs of 72 mW. The analysis of the OSL curves was carried out through the observation of trends in the variations of initial OSL signal (integrated in the first 1 s) and the whole OSL signal (integrated in 100 s) normalized by an OSL signal due to a standard irradiation. The results showed that the illumination with 658 nm laser reduces the OSL signal from aluminum oxide samples in the energy range between ~0.1 and ~12 J, and from fluorite in the energy range from ~0.1 to ~4 J. For the 870 nm LED illumination, only fluorite samples showed a reduction in the OSL signal in the range from ~ 0.1 to ~ 15 J of incident light energy. This change was more pronounced for the initial OSL signal than for the integrated signal. The observed changes were independent of the light power used in the illumination. The OSL signal of beryllium oxide samples showed no changes for any of the light beams used. It was also observed that illumination with different incident light energy changes the shape of fluorite OSL curves. The characteristic decay time of the emission curves grows as the light energy (infrared) deposited on the samples of fluorite increases. The results showed that the OSL technique could be used to evaluate the light energy incident on aluminum oxide, illuminated with 658 nm laser, and on fluorite, illuminated with 870 nm LED. For fluorite samples, the change in the OSL emission curve can also be related to the incident light energy. This fact needs further studies for a better understanding.
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Vorpagel, Andreia Jaqueline [UNESP]. "Híbridos orgânicos-inorgânicos siloxanos àcidos-graxos emissores de luz branca." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/97928.

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Novos compósitos híbridos orgânicos-inorgânicos foram preparados pela incorporação de nanopartículas de fórmula geral YVO4 dopada com os lantanídeos Yb/Er, Yb/Tm e Yb/Ho em matrizes híbridas do tipo “amidosil”, obtidas da reação de ácido ricinoleico (AR) e 3-aminopropiltrietoxisilano (APTES). Os materiais foram caracterizados por espectroscopia de absorção no infravermelho, difração de raios X, microscopia eletrônica de transmissão e espectroscopia eletrônica. Estas partículas de vanadato de ítrio dopadas com lantanídeos, sob excitação no infravermelho (980 nm) emitem luz na região do visível em diferentes comprimentos de onda, devido a mecanismo de conversão ascendente de energia. A união nanopartículas e híbrido permitiu obter novos materiais híbridos emissores de luz branca, graças a um ajuste fino na relação matriz/partícula
New composite organic-inorganic hybrid compounds were prepared by the incorporation of nanoparticles of general formula YVO4:Ln3+ (Ln= Yb/Er, Yb/Tm, Yb/Ho) in amidosil hybrids obtained from the reaction of ricinoleic acid (RA) and 3-aminopropyltriethoxysilane (APTES). The materials were characterized by infrared absorption spectroscopy, x-ray diffraction, scanning and transmission electron microscopy. Under infrared excitation (980 nm) vanadate nanoparticles emit visible light of different colors due to mechanism energy by up conversion energy transfer. The addition of variable relative contents of the nanoparticles into the hybrid host allowed different emission colors to be observed resulting the white
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Romero, João Henrique Saska [UNESP]. "Efeito de compensação de cargas nas propriedades luminescentes dos materiais 'BA''WO IND.4':'EU POT.3+','LI POT.+'." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/97930.

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As propriedades luminescentes, assim como a luminescência com excitação por raios X (XEOL) dos compostos Ba1-xEuxWO4, Ba1-3xEu2xWO4 e Ba1-2xEuxLixWO4 foram comparadas. As amostras foram obtidas pelo método Pechini com diferentes concentrações de dopante, diferentes atmosferas (mistura verde, argônio ou estática de ar) e temperaturas de tratamento térmico das amostras. BaWO4 forma compostos de estrutura tetragonal tipo Scheelita pertencentes ao grupo espacial I41/a. A substituição de íons Ba2+ por íons Eu3+ fornece dados importantes sobre a estrutura e a microssimetria do íon lantanídeo na matriz. Uma alternativa de compensação de carga com a introdução de Eu3+ no retículo do BaWO4 é a codopagem Li+/Eu3+. Neste sistema, dois cátions Ba2+ são substituídos, gerando a compensação de carga, resultando em propriedades luminescentes únicas. As amostras BaWO4, Ba1-xEuxWO4, Ba1-3xEu2xWO4 e Ba1-2xEuxLixWO4 (x = 1, 3 e 5% em mol) foram tratadas termicamente a 700, 900 e 1100º C e caracterizadas pelas técnicas de difração de raios X (XRD), espectroscopia de espalhamento Raman (RAMAN), espectroscopia vibracional de absorção na região do infravermelho (FTIR), microscopia eletrônica de varredura (SEM), índice de cor (CIE-Lab), espectroscopia de reflectância difusa (DRS), espectroscopia de fotoluminescência (PL), espectroscopia de luminescência com excitação por raios X (XEOL). As medidas XEOL foram realizadas no Instituto de Química Campus Araraquara. Todas as amostras apresentaram o mesmo perfil de difração, independentemente da concentração de dopante (máximo de 10%, Eu3+,Li+). A fase Scheelita (JCPDS-PDF nº 43-646) foi constatada. As exceções são as amostras BaWO4:Eu3+,Li+ dopadas com 1:1 e 3:3%, tratadas a 700 e 900 °C, que possuem baixa cristalinidade...
Luminescent properties, including X-ray excited optical luminescence (XEOL) of compounds Ba1-xEuxWO4, Ba1-3xEu2xWO4 and Ba1-2xEuxLixWO4 were compared. Samples were prepared by the Pechini method according to different dopand concentrations, different atmosphere (green mixture, argon and static air) and temperature during the thermal treatment of samples. Scheelite tetragonal structures of BaWO4 belongs to the space group I41/a. The Eu3+ substitutes for Ba2+ ions can provide important data on the structure and micro symmetry of lanthanide ions in the host lattice. An alternative way to charge compensation with the introduction of Eu3+ in the BaWO4 lattice is the co-doping with Li+ / Eu3+. In this system two Ba2+ cations were replaced, resulting in different luminescent properties. Samples of BaWO4, Ba1- xEuxWO4, Ba1-3xEu2xWO4 and Ba1-2xEuxLixWO4 ( x = 1, 3 and 5 mol%) and BaWO4: Eu3+, Li+ (1:1, 3:3, 5:5 mol%) were thermally treated at 700, 900 and 1100 °C and characterized by X-ray diffraction (XRD), Raman scattering vibrational spectroscopy (RAMAN), infrared absorption vibrational spectroscopy of (FTIR), scanning electron microscopy (SEM), color index, UV-Vis diffuse reflectance spectroscopy (DRS), photoluminescence spectroscopy (PL), X-ray excited optical luminescence (XEOL). All samples showed the same X-ray diffraction profile, independently of the dopants concentration (maximum of 10 at.%, Eu3+ + Li+) where it was observed the BaWO4 scheelite phase (JCPDS-PDF nº 43-646). The exceptions are the samples BaWO4:Eu3+,Li+ with 1,0:1,0 at.% and 3.0:3.0 at.%, treated at 700 and 900 °C, which presented low crystallinity. Greater crystallite size is achieved with smallest dopant concentration and highest thermal treatment temperature (700 to 1100 ºC). The study of the optical properties of Ba1-xEuxWO4, Ba1-3xEu2xWO4 e Ba1-2xEuxLixWO4 indicated that in... (Complete abstract click electronic access below)
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Books on the topic "Luminescence"

1

Pagonis, Vasilis. Luminescence. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67311-6.

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Goldberg, Marvin C., ed. Luminescence Applications. Washington, DC: American Chemical Society, 1989. http://dx.doi.org/10.1021/bk-1989-0383.

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Hänninen, Pekka, and Harri Härmä, eds. Lanthanide Luminescence. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21023-5.

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Yukihara, Eduardo G., and Stephen W. S. McKeever. Optically Stimulated Luminescence. Chichester, UK: John Wiley & Sons, Ltd, 2011. http://dx.doi.org/10.1002/9780470977064.

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Vij, D. R., ed. Luminescence of Solids. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5361-8.

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Miomandre, Fabien, and Pierre Audebert, eds. Luminescence in Electrochemistry. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49137-0.

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Kitai, A. H., ed. Solid State Luminescence. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1522-3.

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R, Vij D., ed. Luminescence of solids. New York: Plenum Press, 1998.

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Vij, D. R. Luminescence of Solids. Boston, MA: Springer US, 1998.

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Baeyens, Willy R. G., 1948-, De Keukeleire Denis 1943-, and Korkidis Katherine 1954-, eds. Luminescence techniques in chemical and biochemical analysis. New York: M. Dekker, 1991.

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Book chapters on the topic "Luminescence"

1

Forbes, Tori Z. "Luminescence." In Encyclopedia of Earth Sciences Series, 1–4. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-39193-9_24-1.

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Forbes, Tori Z. "Luminescence." In Encyclopedia of Earth Sciences Series, 835–38. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-39312-4_24.

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Zlatkevich, Lev. "Luminescence." In Polymers Properties and Applications, 1–7. New York, NY: Springer New York, 1987. http://dx.doi.org/10.1007/978-1-4613-8695-7_1.

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Weik, Martin H. "luminescence." In Computer Science and Communications Dictionary, 945. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_10772.

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Gooch, Jan W. "Luminescence." In Encyclopedic Dictionary of Polymers, 905. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_14146.

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Zwinkels, Joanne. "Luminescence." In Encyclopedia of Color Science and Technology, 1–5. Berlin, Heidelberg: Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-642-27851-8_383-1.

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Françon, M., N. Krauzman, J. P. Mathieu, and M. May. "Luminescence." In Experiments in Physical Optics, 247–56. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003062349-22.

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Zwinkels, Joanne. "Luminescence." In Encyclopedia of Color Science and Technology, 1116–20. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-030-89862-5_383.

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Zaitsev, Alexander M. "Thermostimulated Luminescence and Tunnel Luminescence." In Optical Properties of Diamond, 405–11. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-04548-0_9.

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Dobrinets, Inga A., Victor G. Vins, and Alexander M. Zaitsev. "Visual Luminescence and Luminescence Imaging." In HPHT-Treated Diamonds, 201–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37490-6_7.

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Conference papers on the topic "Luminescence"

1

Miller, N. C., and K. P. Rispoli. "Electron Beam Induced Luminescence." In ISTFA 2002. ASM International, 2002. http://dx.doi.org/10.31399/asm.cp.istfa2002p0435.

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Abstract A method to detect defects affecting laser diode radiation has been devised by imaging the induced luminescence resulting from a scanning electron beam. Electron Beam Induced Luminescence (EBIL) involves imaging the current from a sensor diode as the SEM electron beam scans across the laser diode surface. Defects preventing laser diode radiation will be shown as contrast variations in the EBIL image. This technique is similar to electron beam induced current (EBIC), reference 1, in which the electron beam provides the capability for measuring subsurface electrical and physical parameters that effect device electrical performance. However in the case of EBIL, laser diode radiation is utilized as the imaging parameter providing direct correlation between the semiconductor active layer and the resultant diode luminescence output. Alternative techniques such as Cathode Luminescence (CL), reference 2 and 5, in the scanning electron microscope (SEM) have been used for examination of semiconductor laser diodes for defects preventing radiation. However CL SEM analysis requires costly accessories, including at least an ellipsoidal mirror and a cooled photomultiplier tube sensitive to the particular laser diode output frequency. In addition the laser diode must be at the focal point of an ellipsoidal mirror, making CL SEM examination of a packaged laser diode difficult or impossible. This paper will describe the EBIL technique using several test diodes to demonstrate the ability of EBIL to image diode luminescence and defects affecting luminescent output. Deprocessing of the laser diode top electrode and EBIL operating parameters will be discussed.
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Liskov, I. YU, B. P. Aduev, G. M. Belokurov, and Z. R. Ismagilov. "Luminescence of coals excited by a pulsed electron beam." In 8th International Congress on Energy Fluxes and Radiation Effects. Crossref, 2022. http://dx.doi.org/10.56761/efre2022.r2-o-031601.

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The paper presents the spectral and kinetic characteristics of the glow of coals from the Kuznetsk basin: brown, long-flame gaseous, gaseous and coke when excited by a pulsed electron beam (240 keV, 25 ns, 20 J/cm2). The glow that occurs in coals as a result of exposure at a temperature of T = 300 K has a luminescent character. The glow intensity increases in 50–100 ns with a subsequent decrease in ≈500 ns. The luminescence spectra of coals are presented at the moment of reaching the maximum luminescence intensity. Against the background of broadband luminescence, a number of narrow bands associated with the luminescence of polycyclic aromatic hydrocarbons are observed in all coals.
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Alfimov, M. V., and V. B. Nazarov. "Luminescent Recording Media with Photochemical Recording for Optical Memory." In Optical Data Storage. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/ods.1989.pdp4.

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Luminescent recording media is a thin polymer film incorporated light-sensitive compound which as the result of photochemical reaction under recording beam irreversibly transforms into another compound with luminescence. With information reading light induces luminescence registered by a photoelectronic receiver. Analogous principle is considered in (1,2).
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Soyama, Hitoshi. "Luminescent Spots Induced by a Cavitating Jet." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-33018.

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As cavitation bubble collapses cause hot spots and/or radicals such as hydroxyl radical, luminescence was observed at bubble collapsing region. The luminescence induced by acoustic cavitation is named as sonoluminescence. In the present paper, luminescence induced by hydrodynamic cavitation was investigated. In order to generate hydrodynamic cavitation, a high-speed water jet was injected into a water-filled chamber. This sort of the jet with cavitation is called as a cavitating jet. The intensity of luminescence of the cavitating jet was evaluated by a luminescence analyzer and the aspect of the cavitating jet was observed by a cooled electron multiplication charged-coupled device camera. It was revealed that the luminescent spots induced by the cavitating jet were observed by the camera.
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Fischer, C., M. Woehlecke, T. Volk, and N. Rubinina. "Influence of the Damage Resistant Impurities on the UV-Excited Luminescence In LiNbO3." In Photorefractive Materials, Effects, and Devices II. Washington, D.C.: Optica Publishing Group, 1993. http://dx.doi.org/10.1364/pmed.1993.thb.8.

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Sharma, Pallavi, Sachin Tyagi, and Sudipta Sarkar Pal. "Piezo-Luminescence Based ZnS:Mn/Polyurethane Blended Thin Films for Energy Conversion Applications." In Applied Industrial Spectroscopy. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/ais.2023.jtu4a.30.

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Ruan, Xiulin, and Massoud Kaviany. "Temperature-Dependent Luminescence Quenching in Random Nano Porous Media." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60363.

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The luminescence quenching of a random, crystalline one-dimensional model porous medium doped with rare-earth elements, is analyzed by considering the transport, transition, and interaction of the fundamental energy carriers. The quenching in nano porous media is enhanced compared to a single crystal, due to multiple scattering, enhanced absorption, and low thermal conductivity. The coherent wave treatment is used to calculate the photon absorption, in order to allow for field interference and enhancement. The luminescent and thermal emission is considered as incoherent. The luminescence quenching and non-linear thermal emission, occurring with increasing irradiation intensity, are predicted.
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Li, Jing, Jiyang Wang, Shujuan Han, Yongjie Guo, and Yongzheng Wang. "Syntheses and luminescent properties of new luminescence material Nd3PO7." In 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), edited by Yadong Jiang, Junsheng Yu, and Zhifeng Wang. SPIE, 2012. http://dx.doi.org/10.1117/12.977773.

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Weber, Marvin J., J. Wong, R. B. Greegor, F. W. Lytle, and D. R. Sandstrom. "Optically detected x-ray absorption spectroscopy of luminescent materials." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.mgg2.

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X-ray absorption near edge and extended fine structure (EXAFS/XANES) has been observed from luminescence excitation spectra of crystals and glasses using synchrotron radiation. The luminescence may either be intrinsic (recombination radiation from alkaki halides, alkaline earth fluorides, oxides) or from activator ions (rare earths, transition metals, organic dyes) excited directly or indirectly. Core electron excitations of cations and anions in luminescent materials have been investigated in the energy range from the VUV to hard x-rays. Absorption features may appear as an increase or decrease in the luminescence intensity depending on the sample thickness with respect to the x-ray absorption length, observation geometry, and intermediate relaxation processes. For materials with multiple sites, conventional x-ray absorption spectroscopy measures some average of different site populations. Since luminescence spectra vary with the local environment, using optical detection measurements can be both atom specific via the characteristic x-ray absorption edge energy and site and valence specific via the optical wavelength.
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Jeżowska-Trzebiatowska, B., B. Kochel, J. Sławiński, and W. Stręk. "Biological Luminescence." In Proceedings of the First International School. WORLD SCIENTIFIC, 1990. http://dx.doi.org/10.1142/9789814539807.

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Reports on the topic "Luminescence"

1

Hurtubise, R. J. Solid-matrix luminescence analysis. Office of Scientific and Technical Information (OSTI), January 1993. http://dx.doi.org/10.2172/6568645.

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Hurtubise, R. J. Solid-surface luminescence analysis. Office of Scientific and Technical Information (OSTI), January 1991. http://dx.doi.org/10.2172/5838859.

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Robert J. Hurtubise. Solid-Matrix Luminescence Analysis and Coupling Solid-Matrix Luminescence with Separation Methodology. Office of Scientific and Technical Information (OSTI), August 2007. http://dx.doi.org/10.2172/1009088.

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Hurtubise, Robert J. Solid-Matrix Luminescence Analysis and Coupling Solid-Matrix Luminescence with Separation Methodology. Office of Scientific and Technical Information (OSTI), June 2004. http://dx.doi.org/10.2172/838042.

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Simpson, M. L., and G. S. Sayler. Wireless Luminescence Integrated Sensors (WLIS). Office of Scientific and Technical Information (OSTI), November 2003. http://dx.doi.org/10.2172/940383.

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Yukihara, Eduardo G., Joseph J. Talghader, Luiz G. Jacobsohn, and John Ballato. Luminescence Materials as Nanoparticle Thermal Sensors. Fort Belvoir, VA: Defense Technical Information Center, June 2016. http://dx.doi.org/10.21236/ad1011725.

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Talghader, Joseph J. Thermal History Using Microparticle Trap Luminescence. Fort Belvoir, VA: Defense Technical Information Center, June 2012. http://dx.doi.org/10.21236/ada563210.

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Gotthold, David W., Nigel Browning, Eric Jensen, Alan Joly, and Nathan Canfield. Optically Stimulated Luminescence Based Optical Data Storage. Office of Scientific and Technical Information (OSTI), May 2016. http://dx.doi.org/10.2172/1474181.

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Largent, Craig C. Liquid Contact Luminescence from Semiconductor Laser Materials. Fort Belvoir, VA: Defense Technical Information Center, January 1997. http://dx.doi.org/10.21236/ada320372.

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Miller, Steven D., Brion J. Burghard, James R. Skorpik, Richard J. Traub, and Leslie J. Schwartz. Low-Resolution Imaging using Optically Stimulated Luminescence. Office of Scientific and Technical Information (OSTI), November 1999. http://dx.doi.org/10.2172/877102.

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