V. A. Aseev

V. A. Aseev
ITMO University | SPbNRU ITMO · Department of Optical Information Technologies and Materials

PhD

About

92
Publications
8,272
Reads
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375
Citations
Citations since 2017
40 Research Items
292 Citations
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
Additional affiliations
February 2002 - present
ITMO University
Position
  • Professor (Associate)

Publications

Publications (92)
Article
Full-text available
Rare earth activated powders are widely regarded as promising candidates for optical thermometry due to their unique photoluminescence characteristics. The paper presents the structural and luminescent properties of crystalline powders of gadolinium and yttrium oxides (Gd1−xYx)2O3, doped with Nd3+ ions, synthesized by the liquid polymer-salt method...
Article
A study of the optical, spectral-luminescent and holographic properties of the chlorine-containing photo-thermo-refractive (PTR) glass doped with neodymium ions was carried out. The chlorine-containing PTR glass has been recently produced by replacing the bromine in the standard PTR glass with chlorine. The glass was doped with different concentrat...
Article
Full-text available
The purpose of this work is the study of laser cleaning of historical paper. The effect of laser exposure of the paper reflectance, fracture resistance and acidity was investigated. The paper surface roughness before and after laser treatment was analyzed by optical and scanning electron microscopy. It was shown that use of multi-pulse micromachini...
Article
Full-text available
The use of neodymium-doped nanocrystalline powders of yttrium-gadolinium oxide and yttrium gadolinium garnet to increase the sensitivity of local fluorescent optical temperature sensors is considered. Based on the temperature dependences of the neodymium fluorescence spectra in this powders, univariate (using fluorescence intensity ratio from therm...
Article
A silica microcapillary preform and a hollow-core anti-resonant optical fiber doped with small-size (<50 nm) Gd2O3:Nd³⁺ nanocrystals are fabricated by the liquid polymer-salt method for the first time, to our knowledge. Aqueous solutions of gadolinium nitrate and neodymium chloride and a soluble organic polymer (polyvinylpyrrolidone) are used to fo...
Article
We developed a new chloride photo-thermo-refractive glass doped with ytterbium ions. The dependence of optical and spectral-luminescent characteristics on ytterbium concentration has been studied. Concentration dependence of excited state decay time has been analyzed taking into account the self-trapping and self-quenching mechanisms. The optimum c...
Article
This work describes the study of the synthesis and characterization of bactericidal ZnO-SnO2 nanocomposites prepared by polymer-salt method. The structure and morphology of prepared materials were studied by XRD and SEM analysis. Prepared ZnO-SnO2 nanocomposites demonstrate the ability to generate singlet oxygen under external irradiation and high...
Article
Full-text available
The paper describes aspects of Gd 2 O 3 :Nd ³⁺ phosphors synthesis by the liquid polymer-salt method. The double role of polyvinylpyrrolidone as an organic solvent was revealed in the process of highly-luminescent cubic nanocrystals formation. The developed technique was applied for modification of a hollow-core anti-resonant optical fiber by thin...
Article
Erbium-doped glasses with the molar composition 40PbO–35Bi2O3–25Ga2O3–xEr2O3 (mol.%, x = 0, 0.04, 0.08, 0.16, 0.27, 0.39), have been prepared by conventional melt quenching technique in alumina crucible. The values of characteristic temperatures, the thermal stability parameter and phonon energy of the undoped glass matrix were measured. The values...
Article
Spectral-luminescent characteristics of erbium ions in photo-thermo-refractive (PTR) glasses doped with different concentrations of ytterbium and erbium oxides were investigated in this work. X-ray diffraction pattern of studied glasses was carried out. Judd-Ofelt parameters of intensity Ωt were obtained and used for deriving emission cross-section...
Article
Abstract. A method has been demonstrated to reduce temperature calibration error by integrated using principal component analysis, hierarchical cluster analysis and searching combination moving window interval projection to latent structures for fluorescent spectra of Er-doped 98MgCaSrBaYAl2F14-2Ba(PO3)2 and Yb-doped CaF2. The consecutive and consi...
Article
We report data on the development of a polymer – salt method for the formation of aluminium yttrium garnet crystals doped with neodymium ions (YAG : Nd) inside the channels of a preform of microstructured fibre based on pure silica glass. The crystals are obtained by impregnating the channels with aqueous solutions of thermally decomposable salts (...
Article
To obtain the near infrared luminescence Bi-activated phosphate-aluminum-natrium glasses were synthesized and treated under reduction conditions. The reduction conditions were achieved by different methods: treatment in graphite atmosphere, hydrogen atmosphere, and X-ray irradiation. The spectral-luminescent properties of glass samples were measure...
Article
Full-text available
The article is devoted to spectral and luminescent properties of glasses of 98MgCaSrBaYAl2F14-2Ва(PO3)2 composition with ErF3 content 0; 0.1; 0.5 and 1.0 mol. %. Samples of glasses were prepared by high-temperature synthesis in an argon atmosphere. It was found that the matrix of fluoroaluminate glass, has a wide spectral transparency range from 0....
Article
Multivariate methods are applied to the calibration of temperature in the range from 299 to 423 K for the green fluorescence spectra of erbium in lead–fluoride glass doped with 0.5 mol % of erbium and 10 mol % of ytterbium. It is shown that the regression to latent structures using the combination of moving spectral windows is characterized, among...
Conference Paper
Full-text available
Laser and holographic properties of a new photo-thermo-refractive glass doped with neodymium and ytterbium-erbium ions have been studied. The glass is a promising medium for monolithic integration of laser and holographic elements.
Article
New Er³⁺-doped fluoroaluminate glasses were examined as a host matrix for optical temperature sensors. The upconversion spectra as a function of temperature have been measured in the temperature range from 20 °C (293 K) to 235 °C (508 K). The nature of the upconversion luminescence bands with maxima around 522 nm and 550 nm corresponding to the tra...
Article
The efficiency of interval methods for selecting variables and the divisive method of interval optimization by a genetic algorithm is considered with the purpose to increase the accuracy of temperature calibration by projection onto latent structures. The fluorescence spectra of Yb³⁺:CaF2 recorded in the 880–1120 nm band with a resolution of approx...
Article
Novel multicomponent garnet phosphors, Ca2Y1–xEuxSc2GaSi2O12 (x = 0, 0.05, 0.1, 0.25 and 0.5), have been synthesized by a high-temperature solid-state reaction method using the precursors obtained under hydrothermal conditions. Their structures, morphology and vibronic properties have been studied by XRD, SEM methods and Raman spectroscopy. It has...
Article
Data on the observation of simultaneous upconversion on trace erbium and thulium ions in a KGd(WO4)2 crystal excited by IR radiation with the wavelength near 806 nm are presented. The change of excitation schemes with an increase in pumping level and participation of the crystal matrix in the energy transfer from erbium to thulium ions are discusse...
Article
Full-text available
The paper deals with research of glasses based on heavy metal oxides Bi2O3 and PbO. We consider the application possibilityof glasses mentioned above for the upconversion temperature sensors based on the ratio measurement of the luminescencepeaks of Er3 + ions in the 500–700 nm region. The glass composition of 35Bi2O3-40PbO-25Ga2O3 (mol. %) was con...
Chapter
Fluoride Photo-Thermo-Refractive (PTR) glasses are very promising materials for recording Bragg gratings for different laser applications. Design and fabrication of novel chloride and bromide PTR glasses will be discussed. It was shown that various technologies as photo-thermo-induced crystallization, holograms recording, laser treatment, ion excha...
Article
Full-text available
Resonant micro-Raman spectra and the morphology of the interlayer Van der Waals surface are studied for layered thin films of n-Bi2Te3 and solid solutions based on Bi2Te3. It is found that the composition, thickness, surface morphology, and the method of obtaining films affect the relative intensity of Raman phonons, which are sensitive to the topo...
Article
YAG:Ce materials have been extensively studied as phosphors for blue to white light conversion. In the last years, the preparation methods of YAG:Ce powders in the nanometric scale have received intensive attention due to their special optical properties. In this context, the preparation of luminescent particles with high quantum yield (QY) and par...
Article
Principal component analysis of temperature dependences of fluorescence spectra of Yb³⁺:Y3Al5O12 and Yb³⁺:CaF2 is used for determining the Stark structure of Yb³⁺ energy levels. The results obtained are in a good agreement with reference data determined by the conventional methods of absorption and time-resolved fluorescence spectroscopy at low tem...
Article
Luminescent composites of the “phosphor-in-glass” type, based on a highly reflective lead–silicate matrix and fine-grained powders of YAG:Ce³⁺ and SiAlON:Eu²⁺ crystals, are developed and synthesized. Phosphor and glass powders are sintered at a temperature of 550°C to obtain phosphor samples for white LEDs. The composites are analyzed by X-ray diff...
Article
The phonon spectra in thin layers of bismuth telluride and solid solutions of Bi2–x Sbx Te3–y Sey of different composition, belonging to three-dimensional topological insulators, have been investigated by micro-Raman spectroscopy, and the morphology of an interlayer van der Waals (0001) surface in them has been studied by semicontact atomic force m...
Article
Analysis of multiparametric data on transmission spectra of 24 divins (Moldovan cognacs) in the 190–2600 nm range allows identification of outliers and their removal from a sample under study in the following consideration. The principal component analysis and classification tree with a single-rank predictor constructed in the 2D space of principal...
Article
Full-text available
A study is reported of the properties of a new phosphor material based on a highly refractive leadsilicate glass and microparticles of yttrium-aluminum garnet doped with cerium ions (YAG: Ce3+). The mass percentage fraction of YAG: Ce3+ microparticles in the material was varied from 50 to 90%. The optical properties of the phosphor were examined, a...
Article
Full-text available
Structural and spectroluminescence studies have been carried out on the transparency of ytterbium-erbium oxyfluoride glasses and nanoglass-ceramics based on them. The glass-transition temperatures and the crystallization maximum have been established from the results of differential scanning calorimetry. X-ray phase analysis has been used to determ...
Article
Full-text available
Fluorine-phosphate glasses activated with cadmium sulfide quantum dots (QDs) have been investigated. QDs of different sizes (2.8, 3.0, and 3.8 nm in diameter) have been formed as a result of heat treatment near the glass-formation temperature. This variation in the QD size leads to a red shift of the fundamental absorption edge (459 nm) and lumines...
Article
Full-text available
The effect of germanium oxide on the nomenclature and nature of color centers responsible for the induced adsorption of activated phosphate glass was investigated. The spectra of the gamma-irradiated glass based on La(PO3)3 with the GeO2 content not exceeding 40 mol % were recorded and analyzed. It was suggested that the existence of an isosbestic...
Article
Full-text available
Processes of nanocrystalline phase formation in transparent yttrium oxyfluoride nano-glass-ceramics doped with neodymium ions are studied. An optimal heat treatment regime for a given glass composition is determined using differential thermal analysis (DTA). Glasses are heat-treated for 30, 60, and 120 min; the sizes of crystals are calculated, and...
Article
Full-text available
The study and compare of two temperature measurement methods is performed for the case of a lead-fluoride nano-glassceramics in the range from 317 to 423 K with a view to their application to temperature sensors. A method of temperature measurement by means of violet, green and red upconversion fluorescence spectra regression on latent structures a...
Article
Full-text available
The temperature of erbium-doped lead fluoride nano-glass-ceramics in the range from 44 to 150°C is determined by constructing a projection on latent structures of upconversion fluorescence spectra in violet, green, and red bands. It is shown that the four-dimensional space of latent structures provides the best accuracy of temperature measurements....
Article
The partially polarized luminescence of erbium- and thulium-doped glasses exited by the linearly polarized laser radiation was observed. The dependence of the polarization degree on the RE ions concentration and on the glass matrix composition were investigated. For erbium- and thulium-doped glasses, the maximum polarization degree was shown to rea...
Article
Full-text available
Cadmium sulfide quantum dots are perspective materials in optics, medicine, biology and optoelectronics. Fluorophosphate glasses, doped with cadmium sulfide quantum dots, were examined in the paper. Heat treatment led to the formation of quantum dots with diameters equal to 2.8 nm, 3.0 nm and 3.8 nm. In view of such changes in the quantum dots size...
Article
Full-text available
The spectral-luminescent properties of potassium-aluminoborate glass activated by trivalent chromium ions and subjected to thermal treatment at various temperature and duration regimes are studied. The X-ray-phase studies have shown that by thermal treatment of such potassium-aluminoborate glass a crystalline phase of Al2O3: Cr is evolved. The embe...
Article
Full-text available
We compare spectral and holographic characteristics of a novel material designed for manufacture of photothermorefractive (PTR) glass. The parameters of holograms recorded in classical and modified PTR glass are confronted. It is shown that unlike the classical PTR glass, the modified PTR glass does not have an additional absorption band in the blu...
Article
Full-text available
Up-conversion fluorescence spectra of YVO4 and YGdVO4 crystals and lead fluoride nano glass ceramics coactivated with erbium and ytterbium ions have been studied in the wavelength range of 520-560 nm under 967-nm pumping. The ratio of intensities of fluorescence bands in the ranges of 520-530 and 540-550 nm has been measured in the temperature rang...
Article
Full-text available
A technology for production of nano-glass-ceramic materials based on aluminosilicate glass doped with chromium oxide is proposed. A comparative study of the spectral luminescence properties of forsterite glass ceramics and single crystal doped with chromium ions is performed. It is shown that chromium ions are partially incorporated into the glass-...
Article
The optical properties of PbSe quantum dots in glass ceramic based on fluorophosphate glass are studied. Quantum dots were formed by a two-stage thermal treatment. An analysis of the spectral-luminescent characteristics of the material allows us to judge the features of the emergence and growth of quantum dots in the glass ceramic bulk. The sizes o...
Article
The possibility of preparing transparent nanostructured glass ceramics based on fluorophosphate glass with a high content of lanthanide fluorides (Er, Ho, Dy, Yb, Tb, Nd, Eu, Pr, Ce, Sm) was demonstrated. The conditions of the formation and the form of nanocrystals containing rare-earth ions, the growth of which can be seen by the results of differ...
Article
Full-text available
Principal component analysis is applied to violet, green and red bands of upconversion fluorescence spectra of erbium-doped lead fluoride nano-glass-ceramics at temperatures 44-150 °C Main physical phenomena are revealed that contribute to the three first principal components. Possibility of resolving the Stark structure of long-wavelength green fl...
Article
Full-text available
The spectroluminescence properties of fluorophosphate glasses of the Ba(PO3)2-BaF2-CaF2-MgF2-AlF3-SrF2-YF3 system doped with erbium fluoride in concentrations from 1 to 12.5 mol% have been comprehensively investigated. The Judd–Ofelt parameters, the absorption and stimulated-emission cross sections, and the gain spectrum have been calculated for th...
Article
Full-text available
New types of phosphor (YAG:Ce3+: yttrium-aluminum garnet doped with Ce3+ ions) containing glass-ceramics material was developed for light-emitting diodes (LEDs). The optical properties of the experimental samples were investigated and are reported on. Use of new phosphor material in white LEDs fabricated with the “chip-on-board” technology is demon...
Article
The spectral and holographic characteristics of classical and modified photothermorefractive glass are compared. It shows that modified photothermorefractive glass has no additional absorption bands in the blue–green region, as is the case in classical photothermorefractive glass. This makes it possible to record purely phase holograms in modified...
Conference Paper
Full-text available
Green upconversion fluorescence of Er,Yb:YVO4 and Er,Yb:YGdVO4 are studied in the spectral range of 520-560 nm in the temperature range from room temperature to 150°C under 967 nm pumping. It is shown that the temperature measurement sensitivity of fluorescence intensity ratio sensors on the base of these crystals is about 0.008 K-1 and is comparab...
Article
First step of Er-Yb laser based on PTR glass creation was made. Complex study of luminescent characteristics of PTR glass doped with Er-Yb with recorded holograms was made. Direct measurements of population inversion of main Erbium level I-4(13/2) for different Erbium concentrations and pumping power was made. Was shown that spectral and luminescen...
Article
Composite "phosphor-in-glass" based on high refractive index lead-silicate glass and YAG:Ce powder has been developed and synthesized. Glass composition optimization in the order to reduce scattering at glass/phosphor interfaces has been performed. Samples of composite light-converting materials for white LEDs were prepared by sintering glass powde...
Article
Full-text available
We have studied the luminescent properties of lead fluoride silicate nanostructured glass-ceramics doped with ytterbium and erbium ions. We have measured luminescence spectra of glass-ceramics in the visible and near-IR ranges at temperatures of 300 and 77 K and under their pumping at a wavelength of 975 nm. We have examined changes in the luminesc...
Article
Possibility of preparation of transparent nanostructured glass crystalline materials based on fluorophosphate glasses with high fluoride content is demonstrated. The influence of concentration of rare earth ions (REI) on the crystallization process is studied. We determined the conditions of heat treatment to form nanocrystals containing REI whose...
Article
Oxy-fluoride glasses doped with different activators have been developed and synthesized. Investigation of spectral and luminescent properties of the oxy-fluoride glasses have been carried out. The prospects of applications of the glasses as a red phosphor for white light emitted diodes have been discussed.
Article
Organic phosphates and phosphoramidates containing alkoxysilyl group were synthesized and used to obtain the corresponding europium complexes. The latter are shown to be applicable for the formation of organic-inorganic hybrids with the components connected with each other through a chemical bond.
Article
Full-text available
Analysis of the absorption band position for colloidal silver in fluorophosphate glasses of the composition (0.95 − x − y)(MgCaBaSrAl2F14)-0.05Ba(PO3)2-xPbF2-yLnF3 (where Ln = Eu, Ce, Sm, Tb; 0 ≤ x ≤ 0.2; y = 0.01, 0.02) with small additives of AgBr (0.04 wt % above 100%) has been performed. It has been shown that joint introduction of AgBr and EuF...
Article
Full-text available
The crystalline phases formed upon thermal treatment of glasses of composition 18PbF2 · 30SiO2 · 5ZnF2 · 29CdF2 · 15AlO3/2 · (2–5.5)Ln(Y)F3 (mol %) at the crystallization onset temperature have been investigated. The possibility of obtaining nanosized crystals of a new class of PbLnOF3 compounds, in which Ln are lanthanides from Ce to Lu, with a fl...
Article
Lead-fluoride nano-glassceramics doped with ytterbium and erbium have been developed and synthesized. The influence of heating on the green up-conversion luminescence of erbium has been experimentally investigated. Nano-glassceramics are promising candidates for temperature sensors.
Article
Full-text available
Spectral luminescence properties of synthesized transparent nano-glass-ceramics doped with erbium ions are studied. It is shown that, as a result of the secondary heat treatment of nano-glass-ceramics, the width of the luminescence spectrum at half maximum increases more than by 15 nm. Luminescence life-time dependences of erbium ions in studied sa...
Article
Full-text available
A new polyfunctional photo-thermo-refractive (PTR) glass doped with erbium and ytterbium has been developed for the first time. The glass combines itself three opportunities: fabrication of lasers or amplifiers, recording of volume Bragg gratings (VBG) or holographic optical elements (HOE), fabrication of planar waveguides or fiber. The glass can b...
Article
Full-text available
Two types of lead-fluoride nano-glassceramics doped with rare-earth ions (Tm, Ho, Pr, Er, Yb) have been developed and synthesized. The size of crystalline phase achieved up to 40 nm. Spectral and luminescence properties of nanoglassceramics have been investigated. It was shown, that emitting probabilities of different transitions changed during the...
Article
Full-text available
Transparent nanoglassceramics has been synthesized based on lead fluoride silicate glass doped with erbium ions. It is shown that heat treatment of lead fluoride silicate glass leads to the formation of nanoscale (16–40 nm) crystalline phase of lead fluoride. X-ray diffraction analysis and measurement of spectral luminescence properties have reveal...
Article
Full-text available
Comprehensive studies of the spectroluminescence and laser properties of high-concentration photothermorefractive nanoglass-ceramics doped with ytterbium and erbium ions for integrated-optics amplifiers and minilasers have been carried out for the first time. The limiting concentrations of erbium for which amplification is observed have been establ...
Article
Organo-inorganic composites consisting of mutually linked ruthenium complexes with organic ligands and an inorganic SiO2 network were synthesized by the sol-gel method. The luminescence and photosensitive properties of the resulting compounds were studied.