Bibliografías temáticas / Nanoluminophores

Literatura académica sobre el tema "Nanoluminophores"

Autor: Grafiati
Publicado: 4 de mayo de 2024

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Artículos de revistas sobre el tema "Nanoluminophores"

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Giang, Lam Thi Kieu, Lukasz Marciniak, Dariusz Hreniak, Tran Kim Anh y Le Quoc Minh. "Synthesis, Structural Characterization, and Emission Properties of NaYF4:Er3+/Yb3+ Upconversion Nanoluminophores". Journal of Electronic Materials 45, n.º 10 (1 de junio de 2016): 4790–95. http://dx.doi.org/10.1007/s11664-016-4646-7.

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Tagiev, O. B., B. D. Urmanov, M. S. Leonenia, G. P. Yablonskii y H. J. Ibrahimov. "PHOTOLUMINESCENCE OF NANOPHOSPHORS CaAl2O4:Eu3+ IN A WIDE INTERVAL OF TEMPERATURES AND LEVELS OF LASER EXCITATION". Journal of Applied Spectroscopy 89, n.º 4 (20 de julio de 2022): 505–10. http://dx.doi.org/10.47612/0514-7506-2022-89-4-505-510.

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We study the spectra of excitation and photoluminescence of CaAl2O4:Eu3+ nanoluminophores in a wide interval of temperatures and laser excitation levels from 40 to 2.3 · 103 kW/cm2. The photoluminescence spectra of CaAl2O4:Eu3+ have the shape of narrow lines and are located in the region 550–750 nm of the visible spectrum. An extremely high stability of the position and shape of the photoluminescence spectra of nanopowders under investigation is established at high levels of laser excitation up to 2.3 · 103 kW/cm2 at a constant luminescence efficiency up to 60 kW/cm2. A further increase in the excitation level leads to a reversible drop in the photoluminescence efficiency. The threshold of an irreversible drop in the luminescence efficiency has not been reached.
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3

Kemelbekova, А. E. y D. M. Mukhamedshina. "Synthesis of finely dispersed forms of zinc oxide doped with rare-earth elements (review)". Kompleksnoe Ispolʹzovanie Mineralʹnogo syrʹâ/Complex Use of Mineral Resources/Mineraldik Shikisattardy Keshendi Paidalanu 4, n.º 311 (15 de diciembre de 2019): 12–18. http://dx.doi.org/10.31643/2019/6445.33.

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The paper summarizes the literature data, considers methods for producing highly dispersed forms of zinc oxide doped with rare earth elements. Alloying ZnO with rare earths and 4d transition elements is a popular method of manipulating the optical properties of ZnO systems. These systems may also have their own ferromagnetism due to their magnetic moment transmitted to 4f and 4d electrons. Investigations of authors in this field with the aim of using ZnO in metal / oxide composites are also described: the properties of zinc oxide doped REM powders obtained by various technological methods are studied. We studied the work on obtaining the described structures, the selection of the best technological parameters for the growth of thin films. In connection with the development of nanotechnology, REE compounds have become even more popular and are used to produce nanoluminophores, thin films, microporous membranes, and sol-gel glasses.
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4

Shu, Jiangnan, Zhili Han, Tianhua Zheng, Dexin Du, Guizheng Zou y Hua Cui. "Potential-Resolved Multicolor Electrochemiluminescence of N-(4-Aminobutyl)-N-ethylisoluminol/tetra(4-carboxyphenyl)porphyrin/TiO2 Nanoluminophores". Analytical Chemistry 89, n.º 23 (13 de noviembre de 2017): 12636–40. http://dx.doi.org/10.1021/acs.analchem.7b04175.

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Du, Dexin, Jiangnan Shu, Mingquan Guo, Mohammad A. Haghighatbin, Di Yang, Zhiping Bian y Hua Cui. "Potential-Resolved Differential Electrochemiluminescence Immunosensor for Cardiac Troponin I Based on MOF-5-Wrapped CdS Quantum Dot Nanoluminophores". Analytical Chemistry 92, n.º 20 (23 de septiembre de 2020): 14113–21. http://dx.doi.org/10.1021/acs.analchem.0c03131.

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Nizamoglu, Sedat, Evren Mutlugun, Ozgun Akyuz, Nihan Kosku Perkgoz, Hilmi Volkan Demir, Lydia Liebscher, Sameer Sapra, Nikolai Gaponik y Alexander Eychmüller. "White emitting CdS quantum dot nanoluminophores hybridized on near-ultraviolet LEDs for high-quality white light generation and tuning". New Journal of Physics 10, n.º 2 (18 de febrero de 2008): 023026. http://dx.doi.org/10.1088/1367-2630/10/2/023026.

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Stopikowska, Natalia, Marcin Runowski, Przemysław Woźny, Stefan Lis y Peng Du. "Generation of Pure Green Up-Conversion Luminescence in Er3+ Doped and Yb3+-Er3+ Co-Doped YVO4 Nanomaterials under 785 and 975 nm Excitation". Nanomaterials 12, n.º 5 (26 de febrero de 2022): 799. http://dx.doi.org/10.3390/nano12050799.

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Materials that generate pure, single-color emission are desirable in the development and manufacturing of modern optoelectronic devices. This work shows the possibility of generating pure, green up-conversion luminescence upon the excitation of Er3+-doped nanomaterials with a 785 nm NIR laser. The up-converting inorganic nanoluminophores YVO4: Er3+ and YVO4: Yb3+ and Er3+ were obtained using a hydrothermal method and subsequent calcination. The synthesized vanadate nanomaterials had a tetragonal structure and crystallized in the form of nearly spherical nanoparticles. Up-conversion emission spectra of the nanomaterials were measured using laser light sources with λex = 785 and 975 nm. Importantly, under the influence of the mentioned laser irradiation, the as-prepared samples exhibited bright green up-conversion luminescence that was visible to the naked eye. Depending on the dopant ions used and the selected excitation wavelengths, two (green) or three (green and red) bands originating from erbium ions appeared in the emission spectra. In this way, by changing the UC mechanisms, pure green luminescence of the material can be obtained. The proposed strategy, in combination with various single-doped UC nanomaterials activated with Er3+, might be beneficial for modern optoelectronics, such as light-emitting diodes with a rich color gamut for back-light display applications.
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Giang, Lam Thi Kieu, Tran Kim Anh, Nguyen Thanh Binh, Le Quoc Minh, Lukasz Marciniak y Witold Łojkowski. "Fabrication and upconversion emission processes in nanoluminophores NaYF4: Er, Yb and NaYF4: Tm, Yb". International Journal of Nanotechnology 12, n.º 5/6/7 (2015): 538. http://dx.doi.org/10.1504/ijnt.2015.067911.

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Kumar, Rajesh y Sheo K. Mishra. "Enhancement in the luminescence of green-emission from emissive surface defects of Dy3+doped ZnO nanoluminophores: A simple, mass-scale productive approach for optoelectronic devices". Applied Surface Science Advances 9 (junio de 2022): 100256. http://dx.doi.org/10.1016/j.apsadv.2022.100256.

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Shu, Jiangnan, Zhili Han y Hua Cui. "Highly chemiluminescent TiO2/tetra(4-carboxyphenyl)porphyrin/N-(4-aminobutyl)-N-ethylisoluminol nanoluminophores for detection of heart disease biomarker copeptin based on chemiluminescence resonance energy transfer". Analytical and Bioanalytical Chemistry 411, n.º 18 (24 de abril de 2019): 4175–83. http://dx.doi.org/10.1007/s00216-019-01821-2.

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Tesis sobre el tema "Nanoluminophores"

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Cousinié, Sandra. "Nanoluminophores inorganiques : greffage de complexes de ruthénium(II) et d'europium(III) sur nanoparticules de silice". Toulouse 3, 2007. http://thesesups.ups-tlse.fr/176/.

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Ce mémoire a pour objet de développer une nouvelle classe de luminophores inorganiques. L'originalité de notre travail consiste à fonctionnaliser chimiquement des nanoparticules de silice par des complexes de métaux de transition luminescents. Un tel édifice est obtenu grâce à un ligand bifonctionnel possédant d'une part une fonction alkoxysilane pour la liaison chimique à la nanoparticule et d'autre part une bipyridine permettant la complexation des métaux par les atomes d'azote. L'application visée étant la luminescence, nous avons choisi le ruthénium(II) et l'europium(III) pour leurs propriétés optiques intéressantes. Le premier possède des bandes larges mais intenses, le second, un spectre de raies fines caractéristique des lanthanides. Une méthode générale de greffage a été mise au point à partir d'organosilanes commerciaux, elle a été adaptée aux nouveaux ligands bifonctionnels et aux 10 complexes de Ru(II) et aux 4 d'Eu(III) synthétisés. Dans tous les cas, la conservation de l'intégrité des fonctions chimiques est démontrée et la répartition des molécules à la surface de la silice est homogène, de l'ordre d'une millimole par gramme de silice. La taille et la monodispersité des nanoparticules sont conservées. Une étude préliminaire des propriétés de luminescence montre que le greffage de complexes luminescents de ruthénium(II) et d'europium(III) à la surface des nanoparticules de silice semble être une méthode très prometteuse pour l'obtention de nanoluminophores. La sphère de coordination du métal de transition reste un site de choix pour apporter à ces nouvelles sondes une réactivité spécifique telle que l'introduction d'un ligand à reconnaissance biologique
This manuscript focuses on the development of a new family of inorganic luminescent nanoparticles. The originality of this work consists in the chemical functionalization of nanosized silica by luminescent transition metal complexes. We have chosen ruthenium(II) and europium(III) precursors for their interesting optic properties. If the first has broad but intense emission bands, the second is charaterized by a very sharp bands spectrum of lanthanides. We have undertaken the synthesis of organosilyldipyridine derivatives containing one alkoxysilane function. The two sites, bidentate ligand i. E. Dipyridyl group and a trialkoxysilane function, give an interesting silane for both complexing and grafting properties expected in this work. We report on a systematic investigation of the grafting reaction using commercial organosilanes and this general procedure was applied to our new bifunctional ligands, to ten Ru(II) and four Eu(III) complexes. Once grafted, the chemical integrity of the molecules was preserved together with the size and the morphology of silica nanoparticles. This work demonstrates that about one millimol of organosilane per gram of silica was well-distributed on the nanoparticles surface. Nanohybrids have expected luminescence properties, so we have shown that it will be possible to combine transition metal chemistry and nanoscale silicated material chemistry. Although the results are preliminary, work is now in progress to extensively study the luminescence properties of our nanomaterials. Also this grafting protocol may be now applied to various metallic complexes for other properties such as catalytic, optical, electrochemical or coordination
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2

Cousinié, Sandra Menu Marie-Joëlle. "Nanoluminophores inorganiques greffage de complexes de ruthénium(II) et d'europium(III) sur nanoparticules de silice /". Toulouse (Université Paul Sabatier, Toulouse 3), 2008. http://thesesups.ups-tlse.fr/176.

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Smara, Zakarya. "Etudes des propriétés optiques de nanoparticules de fluorures Na(Y,Bi)F4 dopées par des ions de terres rares et synthétisées par coprécipitation". Electronic Thesis or Diss., Université Clermont Auvergne (2021-...), 2021. http://www.theses.fr/2021UCFAC030.

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Ce travail est consacré à l’élaboration de nanoluminophores de formulations β-NaBiF4 et α-NaYF4 monodopés Eu3+, Tb3+, Pr3+, codopés avec Yb3+ et tridopés avec Ce3+. Ces matériaux ont été préparés par coprécipitation, et les paramètres de synthèse ont été optimisés afin de produire des nanocubes (NCs) avec des longueurs d’arête entre 35 et 65 nm, de façon reproductible et avec une distribution de taille étroite. Les NCs de fluorures obtenus ont été caractérisés d’un point de vue structural (DRX, IR), morphologique (MEB et TEM) et optique (photoluminescence) permettant de confirmer leurs puretés cristallines d’une part et d’enregistrer des répartitions spectrales de luminescence conformes à celles attendues d’autre part. L’analyse des spectres d’émission et des déclins de la fluorescence, sous excitations UV et/ou proche infrarouge, a permis de démontrer que des processus de conversion Stokes et anti-Stokes efficaces se produisent dans ces NCs. Les résultats sont discutés en considérant divers chemins de désexcitations radiatives et de transfert d’énergie, permettant de conclure que l’on peut générer sur un même NC les deux processus, même si ces derniers sont en concurrence dans certains cas
This work is devoted to the development of nanophosphors of formulations β-NaBiF4 and α-NaYF4 monodoped Eu3+, Tb3+, Pr3+, codoped with Yb3+ and tridoped with Ce3+. These materials were prepared by coprecipitation, and the synthesis parameters were optimized to produce nanocubes (NCs) with edge lengths between 35 and 65 nm, reproducibly and with a narrow size distribution. The obtained NCs were characterized from a structural (XRD, IR), morphological (SEM and TEM) and optical (photoluminescence) point of view, making it possible to confirm their crystalline purities on the one hand and to record spectral distributions of luminescence in accordance with those expected on the other hand. Analysis of emission spectra and fluorescence decays, under UV and / or near infrared excitations, has demonstrated that efficient Stokes and anti-Stokes conversion processes occur in these NCs. The results are discussed by considering various paths of radiative de-excitations and energy transfer, making it possible to conclude that the two processes can be generated on the same NC, even if the latter are in competition in certain cases
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Actas de conferencias sobre el tema "Nanoluminophores"

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Nizamoglu, Sedat, Evren Mutlugun, Ozgun Akyuz, Nihan Kosku Perkgoz, Hilmi Volkan Demir, Lydia Liebscher, Sameer Sapra, Nikolai Gaponik y Alexander Eychmuller. "White CdS Nanoluminophore based Tunable Hybrid Light Emitting Diodes". En LEOS 2007 - IEEE Lasers and Electro-Optics Society Annual Meeting. IEEE, 2007. http://dx.doi.org/10.1109/leos.2007.4382550.

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