The Experts below are selected from a list of 249 Experts worldwide ranked by ideXlab platform
N. V. Gaponenko - One of the best experts on this subject based on the ideXlab platform.
-
Photoluminescence of the yttrium aluminum composites doped with various concentrations of Terbium
2014 24th International Crimean Conference Microwave & Telecommunication Technology, 2014Co-Authors: A. Podhorodecki, N. V. Gaponenko, J. Misiewicz, L. S. KhoroshkoAbstract:The composites with various Terbium concentrations are synthesized in the silicon-based porous anodic alumina by the coprecipitation method from solutions of yttrium, aluminum and Terbium nitrates. The photoluminescence of these structures is investigated. It is found that the yttrium aluminum composite obtained from the solution with Terbium concentration 0.1 mol.% demonstrates the most intensive photoluminescence in the green range. The Terbium related photoluminescence intensity decreases with a further increase in the concentration of Terbium.
-
Structural and luminescent properties of Terbium doped strontium titanate xerogel
2014 24th International Crimean Conference Microwave & Telecommunication Technology, 2014Co-Authors: M. V. Rudenko, N. V. Gaponenko, A. V. MydryiAbstract:We report on synthesis and photoluminescence of sol-gel derived Terbium doped strontium titanate on monocrystalline silicon and in the porous anodic alumina matrix. The microstructure and morphology of the samples are analyzed by X-ray diffraction and scanning electron microscope analyses. The thickness of the spin-on films deposited on silicon is about 115 and 170 nm due to the annealing temperature 750 and 1000 °C respectively. The samples reveal Terbium luminescence in the visible range.
-
Terbium luminescence under X-rays from YAlO3 composite deposited on porous anodic alumina
2013 23rd International Crimean Conference "Microwave & Telecommunication Technology", 2013Co-Authors: N. V. Gaponenko, A. Podhorodecki, L. S. Khoroshko, I. S. Molchan, G. E. Thompson, V.s. Kortov, V.a. Pustovarov, A.m. Asharif, G. Zatrub, J. MisiewiczAbstract:Terbium-doped yttrium aluminum composite was synthesized by the co-precipitation method. The deposition was made by spinning of the aqueous-alcoholic solution of aluminum and yttrium salts on a porous anodic alumina formed on a monocrystalline silicon substrate. The YAlO3 phase was revealed after the heat treatment at 1000° C. The Terbium luminescence excited by X-rays was observed along with the intense photoluminescence. The synthesis procedure is of interest for the development of radiation-resistant film luminescents.
-
Luminescence structures on the basis of porous anodic alumina
2011 21st International Crimean Conference "Microwave & Telecommunication Technology", 2011Co-Authors: L. S. Stepanova, I. A. Nikolaenko, A. S. Kochev, T. I. Orekhovskaya, N. V. GaponenkoAbstract:In the present paper luminescence from aluminium oxide synthesized in a form of xerogel powders and films doped with Terbium, porous anodic alumina with Terbium ions deposited from the solution of salt, depending on annealing temperature and Terbium concentration is investigated.
-
Luminescent structures based on porous anodic alumina
2008 18th International Crimean Conference - Microwave & Telecommunication Technology, 2008Co-Authors: Y. V. Hluzd, N. V. Gaponenko, T. I. Orehovskaya, I. S. Molchan, G. E. ThompsonAbstract:In this study, the possibility of fabrication of europium- and Terbium-doped structures based on porous anodic alumina (PAA) grown in orthophosphoric and oxalic acid electrolytes, has been investigated. Europium or Terbium ions were introduced in the pores of anodic alumina by either impregnation with sols or by immersion in alcoholic solution containing lanthanide salts. Strong europium and Terbium photoluminescence was observed not only from the structures xerogel/PAA, but in PAA films fabricated in orthophosphoric acid and immersed in solution of lanthanide Elemental depth profiles of PAA of 30 mum thickness revealed homogeneous distribution of lanthanides along the whole thickness of porous layer.
E. A. Anashkina - One of the best experts on this subject based on the ideXlab platform.
-
Ultrashort Mid-IR Pulse Amplification in Chalcogenide Fibers Doped with Rare-Earth Ions
2018 International Conference Laser Optics (ICLO), 2018Co-Authors: E. A. AnashkinaAbstract:We present a numerical study of ultrashort pulse amplification in the 4-5 microns range in chalcogenide gain fibers singly doped with praseodymium, dysprosium, and Terbium ions. The energy of pulses with a repetition rate of 10 MHz can be increased from 10 pJ up to ~10 nJ for praseodymium and Terbium and up to ~1 nJ for dysprosium.
-
Design and Numerical Modeling of Broadband Mid-IR Rare-Earth-Doped Chalcogenide Fiber Amplifiers
IEEE Photonics Technology Letters, 2018Co-Authors: E. A. AnashkinaAbstract:The design of broadband chalcogenide double-clad fiber amplifiers doped with praseodymium, dysprosium, or Terbium ions is reported. A theoretical study of ultrashort pulse amplification in the 4-5 μm range with allowance for realistic fiber parameters: dispersion, nonlinearity, background loss (2 dB/m), and Se-H impurity loss (7 dB/m at 4.6 μm) is presented. It is shown that a gain of more than 15 dB can be achieved for dysprosium amplifiers and more than 25 dB for praseodymium and Terbium ones. The energy of pulses with a repetition rate of 5 MHz can be increased from 10 pJ up to ~1 nJ for dysprosium fibers and up to several nanojoules for praseodymium and Terbium fibers. Further amplification by increasing pump power may be limited by a low damage threshold.
Yasuchika Hasegawa - One of the best experts on this subject based on the ideXlab platform.
-
Terbium oxide fluoride and oxyfluoride nanoparticles with magneto optical properties
Bulletin of the Chemical Society of Japan, 2015Co-Authors: Akira Kawashima, Takayuki Nakanishi, Yuichi Kitagawa, Koji Fujita, Katsuhisa Tanaka, Koji Fushimi, M A Malik, Paul Obrien, Yasuchika HasegawaAbstract:Novel Terbium nanoparticles (TbX: Terbium oxide (Tb2O3), Terbium fluoride (TbF3), and Terbium oxyfluoride (TbOF)) have been prepared and their magneto-optical properties reported. The TbX nanoparti...
Zuhong Lu - One of the best experts on this subject based on the ideXlab platform.
-
sensitized luminescent Terbium nanoparticles preparation and time resolved fluorescence assay for dna
Analytical Chemistry, 2007Co-Authors: Yang Chen, Zuhong LuAbstract:A highly luminescent Terbium nanoparticle as the biolabel based on the sensitization of a dye molecule was prepared. The luminescent complexes included in the particles were composed of a quinolone-based dye molecule as the light-energy transfer donor and a polyaminocarboxylate-based chelator with excellent water-solubility and a high binding constant for lanthanides. The structure of two functional entities in the single molecule made the complex highly luminescent in aqueous solution. Silica nanoparticles containing Terbium complexes were prepared by the reverse microemulsion method. Such a Terbium nanoparticle is as bright as about 340 free Terbium complexes, and it has a 1.5-ms fluorescence lifetime that enables it to be used in the time-resolved fluorescence assays. The conjugate of the nanoparticle with oligonucleotide was prepared and used to carry out a DNA sandwich hybridization assay based on magnetic microbeads as solid-phase carrier. The experimental results showed that the detection sensitivi...
David L Rosen - One of the best experts on this subject based on the ideXlab platform.
-
Chelation Number of Terbium Dipicolinate: Effects on Photoluminescence Lifetime and Intensity
Applied Spectroscopy, 2020Co-Authors: David L Rosen, Stanley NilesAbstract:Time-resolved photoluminescence was studied as a function of chelation number in Terbium dipicolinate. We excited the ligand (dipicolinate) with UV (250 to 330 nm) and collected the emission from the cation (Terbium) in the visible region (450 to 700 nm). The luminescence of Tb(dpa)n3-2n followed a monoexponential decay, with a lifetime (0.66 to 2.0 ms) that decreased continuously as the Terbium chloride concentration increased. The luminescence lifetime of Tb(dpa)+ was 0.66 ms. We measured the luminescence decay time, the peak intensity, and the total time-integrated intensity as a function of Terbium chloride concentration at two dipicolinic acid concentrations and fitted the results to functions of Terbium dipicolinate concentration. We used a model with rapid ligand exchange and rapid back-transfer of energy to fit the data to first order. We also present molar absorptivity spectra of complexes with different chelation numbers.
-
Luminescence Dynamics of Terbium Monodipicolinate in Ethyl Ammonium Nitrate
Applied Spectroscopy, 2020Co-Authors: David L RosenAbstract:Energy level dynamics are experimentally examined for Terbium monodipicolinate dissolved in ethyl ammonium nitrate (EAN). The luminescence lifetime, the luminescence risetime, and the absorption spectrum of Terbium monodipicolinate in EAN are measured. The risetime of luminescence in Terbium dipicolinate is experimentally shown to be nonzero and measurable. A dynamic model is presented that describes the evolution of Terbium dipicolinate luminescence in EAN. The long risetime in the model is caused by a resonance between the 5E6 state in the Terbium cation and the lowest triplet state (T1) in the dipicolinate anion. Bacterial endospore components dissolved in EAN are used to check the time resolution of the experimental apparatus. EAN is discussed partly because it is a room-temperature ionic liquid (RTIL), which is a class of solvents that may be useful for detecting bacterial endospores in the atmosphere.
-
bacterial spore detection and determination by use of Terbium dipicolinate photoluminescence
Analytical Chemistry, 1997Co-Authors: David L Rosen, Charles M Sharpless, Linda B McgownAbstract:A new method to detect bacterial endospores and determine their concentration was demonstrated by the addition of a solution of Terbium chloride to a suspension of bacterial endospores. The Terbium chloride reacted with the calcium dipicolinate in the spore case to form Terbium(III) dipicolinate anion. Solid particles, including residual bacterial particles, were removed by filtering. The photoluminescence from the solution was measured as a function of excitation wavelength, emission wavelength, and bacterial endospore concentration. The photoluminescence from Terbium(III) dipicolinate anion in the solution was easily identified.
