Luminescent Materials
Mostrando 13-24 de 31 artigos, teses e dissertações.
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13. Incorporation of europium III complex into nanoparticles and films obtained by the Sol-Gel methodology
The sol-gel process is very effective for the preparation of new materials with potential applications in optics, sensors, catalyst supports, coatings, and specialty inorganic polymers that can be used as hosts for the accommodation of organic molecules. The low temperature employed in the process is the main advantage of this methodology. In this work, the
Materials Research. Publicado em: 2010-03
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14. Estudo das propriedades opto-eletrônicas de micro-cristais de rubi / Study of opto-electronics properties of ruby micro-crystals
Films of amorphous aluminum-nitride (AlN) were prepared by conventional radio frequency sputtering of an Al+Cr target in a plasma of pure nitrogen. The Cr-to-Al relative area determines the chromium content, which stayed in the ~ 0 3.33 at.% concentration range in the present study. Film deposition was followed by thermal annealing the samples up to 1050 ºC
Publicado em: 2010
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15. Cerium-doped SrHfO3 sol-gel films
SrHfO3 presents high density, which makes it interesting for host lattice when it is doped with rare earths for luminescent materials. The optical and structural studies of Ce3+-doped strontium hafnate films prepared by the sol-gel process are presented in this work. Crack-free films with waveguiding performances were obtained with heat-treatments between 40
Matéria (Rio de Janeiro). Publicado em: 2010
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16. Nanocomposites materials generated from a spray
The Spray Pyrolysis (SP) process has been employed at moderate temperature (470-970 K) for the synthesis of micro- and nano-particles of hydrated metal oxides and of related nanocomposites. It has been applied to iron nitrate solutions, without or with the addition of sodium chloride as a flux. After removal of the flux, nanocomposites of ferrihydrite (5Fe2O
Brazilian Journal of Physics. Publicado em: 2009-04
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17. Síntese e estudo de ortossilicatos de zinco luminescentes com aplicação da técnica sol-gel
Usually, the concepts of the Sol-Gel technique are not applied in experimental chemistry courses. This work presents a feasible experiment for chemistry instruction, which involves the synthesis of luminescent materials - Zn2SiO4, with and without Mn2+ as a dopant - by the Sol-Gel technique. The obtained materials were analyzed by scanning electron microscop
Química Nova. Publicado em: 2009
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18. DEVELOPMENT OF NANOBIOMARKERS FOR USE IN SICKLE CELL ANEMIA / Desenvolvimento de nanomarcadores para serem utilizados na marcação de hemoglobina S (anemia falciforme)
Luminescent materials, such as the rare earths complex, can be used as markers in cytology and immunology, being also used as luminescent biomarkers, once the development of these nanomaterials create new possibilities to many fields, particularly in diagnostic medicine. Besides, it establishes one kind of fluorescent probes, for which there are no equivalen
Publicado em: 2009
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19. Estudo das propriedades estruturais e ópticas em materiais nanoestruturados a base de silício. / Study of structural and optical properties in nanostructured silicon based films.
The aim of this doctorate thesis is to enhance the knowledge in the research conducted along the Master degree based on the characterization and study of the structural and luminescent properties of silicon rich silicon oxynitride films (SiOxNy:H) deposited at low temperature by Plasma Enhanced Chemical Vapor Deposition (PECVD). The results of this study ind
Publicado em: 2009
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20. Síntese e caracterização de vidros de telureto dopados com íons de Eu3+ e Tb3+ com nanopartículas metálicas. / Synthesis and characterization of tellurite glasses doped with Eu3+ and Tb3+ ions with metallic nanoparticles.
This work presents the synthesis and characterization of luminescent properties of vitreous systems TeO2-ZnO e TeO2-ZnO-PbO-Na2O doped with ions of europium and terbium containing silver, gold and copper nanoparticles (NPs), for applications in photonic devices. These glasses have a large window transmission (350-6500 nm), chemical stability, mechanical and
Publicado em: 2009
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21. A contribution to development of polymeric displays by ink jet technique. / Uma contribuição ao desenvolvimento de displays poliméricos com a técnica Ink Jet.
Organic Light Emitters Diodes OLEDs is a promising field of study and a huge market opportunity to semiconductor players. Thanks to its potential characteristics to replace the main todays display technologies like lightweight, low voltage, wide viewing angle, high resolution, fast switching, broad color range and the possibility to fabricate flexible device
Publicado em: 2008
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22. Characterization of semiconductor polymers for use in gamma radiation sensors. / Caracterização de polímeros semicondutores para o uso em sensores de radiação gama.
This work aims the investigation of the optical properties of luminescent polymeric systems when submitted to different gamma radiation doses. Solutions of poly[2-methoxi-5-(2etil-hexiloxi)-p-phenilenevinilene] - MEH-PPV in chloroform were prepared. From those solutions, thin film layers of MEH-PPV were deposited on glass substrates. The polymer solutions an
Publicado em: 2008
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23. SÃntese e estudo espectroscÃpico de complexos de Ãons lantanÃdeos incorporados em materiais hÃbridos orgÃnicos-inorgÃnicos
In this work two new europium and gadolinium b-diketonate complexes, [Ln(btfa)3(4,4 -bpy)(EtOH)] (Ln = Eu, Gd; 4,4 -bpy = 4,4 -bipyridine; btfa = 4,4,4- trifluoro-l-phenyl- 1,3-butanedione), were prepared and incorporated into a organicinorganic hybrid material. The general formulae of these complexes were confirmed by X-rays single crystal data and elementa
Publicado em: 2007
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24. SÃntese e caracterizaÃÃo de nanocristais luminescentes baseados em semicondutores II-VI para fins de aplicaÃÃo como biomarcadores
In this work we present synthetic procedures in aqueous medium for the obtention of luminescent II-VI (CdS/Cd(OH)2 and CdTe/CdS) semiconductor nanocrystals. These methodologies, based on colloidal chemistry, resulted in particles with a size average of 8,5 nm for the CdS/Cd(OH)2 system and 3,8 nm for the CdTe/CdS system. The optical properties of these mater
Publicado em: 2006