Articles de revues sur le sujet « Nanoluminophores »

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1

Giang, Lam Thi Kieu, Lukasz Marciniak, Dariusz Hreniak, Tran Kim Anh et Le Quoc Minh. « Synthesis, Structural Characterization, and Emission Properties of NaYF4:Er3+/Yb3+ Upconversion Nanoluminophores ». Journal of Electronic Materials 45, no 10 (1 juin 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 et H. J. Ibrahimov. « PHOTOLUMINESCENCE OF NANOPHOSPHORS CaAl2O4:Eu3+ IN A WIDE INTERVAL OF TEMPERATURES AND LEVELS OF LASER EXCITATION ». Journal of Applied Spectroscopy 89, no 4 (20 juillet 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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Kemelbekova, А. E., et 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, no 311 (15 décembre 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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Shu, Jiangnan, Zhili Han, Tianhua Zheng, Dexin Du, Guizheng Zou et Hua Cui. « Potential-Resolved Multicolor Electrochemiluminescence of N-(4-Aminobutyl)-N-ethylisoluminol/tetra(4-carboxyphenyl)porphyrin/TiO2 Nanoluminophores ». Analytical Chemistry 89, no 23 (13 novembre 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 et Hua Cui. « Potential-Resolved Differential Electrochemiluminescence Immunosensor for Cardiac Troponin I Based on MOF-5-Wrapped CdS Quantum Dot Nanoluminophores ». Analytical Chemistry 92, no 20 (23 septembre 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 et 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, no 2 (18 février 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 et 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, no 5 (26 février 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 et Witold Łojkowski. « Fabrication and upconversion emission processes in nanoluminophores NaYF4 : Er, Yb and NaYF4 : Tm, Yb ». International Journal of Nanotechnology 12, no 5/6/7 (2015) : 538. http://dx.doi.org/10.1504/ijnt.2015.067911.

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Kumar, Rajesh, et 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 (juin 2022) : 100256. http://dx.doi.org/10.1016/j.apsadv.2022.100256.

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Shu, Jiangnan, Zhili Han et 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, no 18 (24 avril 2019) : 4175–83. http://dx.doi.org/10.1007/s00216-019-01821-2.

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Курдюков, Д. А., Д. А. Еуров, М. К. Рабчинский, Д. А. Кириленко, М. М. Бржезинская, С. Д. Савельев, А. Н. Смирнов et В. Г. Голубев. « Белые нанолюминофоры на основе модифицированных ионами европия монодисперсных углеродных наноточек ». Письма в журнал технической физики 48, no 7 (2022) : 28. http://dx.doi.org/10.21883/pjtf.2022.07.52289.19116.

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The template method was used to synthesize monodisperse carbon nanodots modified with europium ions and exhibiting photoluminescence in the entire visible spectral range. The chemical composition and structure of the obtained white nanoluminophore were studied by X-ray spectral and microscopic methods.
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Юров, Виктор Михайлович, Динара Армияевна Ибрагимова, Василий Сергеевич Портнов et Алия Думановна Маусымбаева. « NANOSTRUCTURES OF RARE-EARTH METALS IN THE COALS OF THE SHUBARKOL DEPOSIT ». Physical and Chemical Aspects of the Study of Clusters, Nanostructures and Nanomaterials, no 14 (15 décembre 2022) : 736–46. http://dx.doi.org/10.26456/pcascnn/2022.14.736.

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Редкие металлы углей месторождения Шубарколь имеют толщину поверхностного слоя около 3 нм, т.е. представляют собой наноструктуру. Толщина поверхностного слоя самого угля равна около 0,2 мкм, т.е. представляет собой мезоструктуру. Радиус поры в угольном веществе равен 30,6 нм, что соответствует мезопорам, а удельная поверхность угля равна 857 м/г. Редкие металлы либо в виде чистых примесей (~3 нм), либо в виде окислов (~7 нм), либо в виде органических примесей (~1-3 нм), свободно входят в мезопоры угля. Формы нахождения урана и редких металлов в углях Шубаркольского месторождения свидетельствуют о том, что их концентрирование в угле обусловлено ведущей ролью гидрогенного механизма. В слое d(I) все редкие металлы представляют собой нанолюминофоры, которые можно рассматривать как чувствительные молекулярные зонды для исследования структуры угля. Подчеркнуто, что влияние размерных эффектов на кинетику затухания люминесценции и аномальную термализацию редких земель нетрудно получить экспериментально. Фрактальная размерность угля Шубарколя равна 2,60, что ниже, чем у антрацита - 2,74. В мезопористой структуре угля Шубарколя весьма развита адсорбция примесей редких металлов вследствие формирования на поверхности этих мезопор адсорбционных слоев, которые приводят к объемному заполнению этих пор путем механизма капиллярной конденсации. The rare metals of the Shubarkol coal deposit have a surface layer thickness of about 3 nm, i.e. are nanostructures. The thickness of the surface layer of the coal itself is of about 0,2 pm, i.e. it is a mesostructure. The pore radius in the coal substance is 30,6 nm, which corresponds to mesopores, and the specific surface area of coal is 857 m/g. Rare metals, either in the form of pure impurities (~ 3 nm), or in the form of oxides (~ 7 nm), or in the form of organic impurities (~ 1-3 nm), freely enter into mesopores of the coal. The forms of occurrence of uranium and rare metals in the coals of the Shubarkol deposit indicate that their concentration in the coal is due to the leading role of the hydrogenous mechanism. In the d(I) layer, all rare metals are nanoluminophores, which can be considered as sensitive molecular probes for studying the structure of coal. It is emphasized that the influence of size effects on kinetics of the luminescence decay and anomalous thermalization of rare earths can be easily obtained experimentally. The fractal dimension of Shubarkol coal is 2,60, which is lower than that of anthracite - 2,74. In the mesoporous structure of Shubarkol coal, the adsorption of rare metal impurities is highly developed due to the formation of adsorption layers on the surface of these mesopores, which lead to volumetric filling of these pores by mechanism of the capillary condensation.
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Zuev, M. G., V. G. Il'ves, S. Yu Sokovnin et A. A. Vasin. « Photon avalanche in nanoluminophore obtained by REE silicate evaporation ». Results in Optics 5 (décembre 2021) : 100189. http://dx.doi.org/10.1016/j.rio.2021.100189.

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Wawrzynczyk, D., A. Bednarkiewicz, M. Nyk, J. Cichos, M. Karbowiak, D. Hreniak, W. Strek et M. Samoc. « Optimisation of Ligand Exchange Towards Stable Water Suspensions of Crystalline NaYF4 : Er3+, Yb3+ Nanoluminophors ». Journal of Nanoscience and Nanotechnology 12, no 3 (1 mars 2012) : 1886–91. http://dx.doi.org/10.1166/jnn.2012.5202.

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Зуев, М. Г., А. А. Васин, В. Г. Ильвес et С. Ю. Соковнин. « Новые апконверсионные объемные и нанолюминофоры на основе Sr-=SUB=-2-=/SUB=-Y-=SUB=-8-x-y-=/SUB=-Yb-=SUB=-y-=/SUB=-Tm-=SUB=-x-=/SUB=-Si-=SUB=-6-=/SUB=-O-=SUB=-26-=/SUB=- ». Оптика и спектроскопия 131, no 5 (2023) : 683. http://dx.doi.org/10.21883/os.2023.05.55721.55-22.

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Polycrystalline phosphors with a Sr2Y8-x-yYbyTmxSi6O26 (x=0.005-0.5, y=0.2,0.3) total formula were synthesized. Nanoluminophor has been obtained from the Sr2Y7.695Yb0.3Tm0.005Si6O26 microcrystalline sample by the vacuum electron been evaporation, in the amorphous state, with the ~10.6 nm particle size. It is found, raman spectra undergoing modification by the transition from bulk- to nanosize state. Photoluminescene spectra micro- and nanophosphors are studied. Intensity of the blue emission, by the UV ligth excitation, grows in the x=0.005-0.02 region, with the x increasing. Upconversion photoluminescence (UPCL) spectra of the bulk phosphors and nanosample based on the Sr2Y7.695Yb0.3Tm0.005Si6O26 were measurd. At the pumping power around 70.8 mW, by the laser source with the λ=980 nm, thereshold population of the 3F3 level of Tm3+ ions exist. At a power higher 70.8 mW, a sharp increase of the luminescence intensityof the bulk- and nanophosphor occurs. For the 3H4->3H6 transition thereshold pumping power absent. This indicates that, pumping, during Yb->Tm energy transer, is a single photon process.
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Paskhin, Mark, Dina Kazantseva, Julia Ermakova, Daria Grigorieva et Denis Yanykin. « Activation of Tomato Growth Under Photoconversion Coatings with Nanoluminophor Sr0.76Ba0.20Yb0.02Er0.02F2.04 ». BIO Web of Conferences 57 (2023) : 06004. http://dx.doi.org/10.1051/bioconf/20235706004.

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The effect of coatings containing upconversion luminescent nanoparticles on the cultivation of Solanum lycopersicum has been studied. Sr0.76Ba0.20Yb0.02Er0.02F2.04 particles capable of converting infrared radiation into visible light (λem = 660 nm, 545 nm, and 525 nm) were used as the phosphor. It was shown that the cultivation of tomatoes under photoconversion coatings accelerated the adaptation of plants to ultraviolet radiation. A more efficient distribution of the energy of absorbed light between the processes of photosynthesis and thermal dissipation under upconversion coatings was revealed. As a result, plants grown under photoconversion coatings increased the number and total leaf area, stem length, and leaf chlorophyll content.
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Guo, Mingquan, Jiangnan Shu, Dexin Du, Yisha Wang et Hua Cui. « Tetrakis (4-carboxyphenyl) porphyrin and Ru(bpy)32+ modified SiO2 nanosphere for potential and wavelength resolved electrochemiluminescence ». Journal of Materials Chemistry C, 2023. http://dx.doi.org/10.1039/d3tc02089d.

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Potential resolved electrochemiluminescence (ECL) nanoluminophores are very important for precise analysis and simultaneous determination of multi-targets. Designing ideal potential resolved ECL nanoluminophores, generating multiple high efficiency ECL emissions without overlap...
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Kurdyukov, D. A., D. A. Eurov, M. K. Rabchinskii, D. A. Kirilenko, M. M. Brzhezinskaya, S. D. Saveliev, A. N. Smirnov et V. G. Golubev. « White Nanoluminophores Based on Monodisperse Carbon Nanodots Modified with Europium Ions ». Technical Physics Letters, 2 août 2022. http://dx.doi.org/10.1134/s1063785022040101.

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Li, Peipei, Zhenjuan Xu, Lili Zhao, Haoyu Chen, Xiaohua Zhu, Youyu Zhang, Meiling Liu et Shouzhuo Yao. « Nanoluminophores Composed of 1,1′-Ferrocenedicarboxylic Acid and Tetrakis-(4-carboxyphenyl) Porphyrin for Electrochemiluminescence Sensing ». ACS Applied Nano Materials, 6 octobre 2022. http://dx.doi.org/10.1021/acsanm.2c03327.

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Tagiev, O. B., B. D. Urmanov, M. S. Leonenia, G. P. Yablonskii et H. J. Ibrahimov. « Photoluminescence of CaAl2O4:Eu3+ Nanoluminophores over Wide Intervals of Temperature and Laser Excitation Level ». Journal of Applied Spectroscopy, 12 septembre 2022. http://dx.doi.org/10.1007/s10812-022-01409-2.

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Wu, Jiangmin, Yang Wu, Huifang Bian, Zhengdong Peng, Yongmei Liu, Yongde Yin, Jie Du et Xiaoquan Lu. « Fabrication of a ratiometric electrochemiluminescence biosensor using single self-enhanced nanoluminophores for the detection of spermine ». Talanta, août 2022, 123880. http://dx.doi.org/10.1016/j.talanta.2022.123880.

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