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Bright luminescence of diamonds with Ge-V centers
Journal of Luminescence. 2018. Vol. 193. P. 119-124.
Boldyrev K., Маврин Б. Н., Шерин П. С., Попова М. Н.
We report on the quantum yield (eta) and decay time (tau) measurements at room temperature for the bright red-orange (602 nm) luminescence from new germanium-vacancy (Ge-V) centers in nano- and microcrystalline diamonds synthesized at high pressure and high temperature. The values eta = 3 +/- 1% and tau = 6.2 +/- 0.2 ns were found. The Stokes shift measured as the energy difference between the maxima of the luminescence and luminescence excitation spectra is negligible. The relative intensity of the zero-phonon line constitutes up to 70% from the total intensity of the luminescence. Results of our ab initio DFT calculations for the ground-state electronic and vibrational structure of (Ge-V)(-) in diamond are presented and discussed.
Priority areas:
engineering science
Language:
English
Boldyrev K., Седов В., Кривобок В. et al., Physica Status Solidi (A) Applications and Materials 2017 Vol. 214 No. 11 P. 1700198-1-1700198-8
The effect of isotopic modification of diamond lattice on photoluminescence (PL) and optical absorption spectra of ensembles of SiV− centers was studied. Thin epitaxial diamond layers were grown by a microwave plasma CH4/H2 mixtures using methane enriched to 99.96% for either 12C or 13C isotopes, while the Si doping was performed by adding a small percentage of silane SiH4 into ...
Added: February 8, 2019
Boldyrev K., Петьков В. И., Шипилов А. С. et al., Журнал неорганической химии 2017 Т. 62 № 2 С. 226-231
Arsenates A0.5Zr2(AsO4)3 (A = Mg, Ca, Sr, Ba), synthesized through sol–gel route with subsequent
heat treatment, have been studied by X-ray diffraction, electron probe microanalysis, and IR spectroscopy.
Mg0.5Zr2(AsO4)3 crystallizes in the Sc2(WO4)3 structure type (space group P21/n). A0.5Zr2(AsO4)3 (A =
Ca, Sr, Ba) crystallize in the NaZr2(PO4)3 structure type (space group R ). The Ca0.5Zr2(AsO4)3 and
Ba0.5Zr2(AsO4)3 structures ...
Added: February 8, 2019
M. : Association of graduates and employees of AFEA named after prof. Zhukovsky, 2018
The materials of The International Scientific – Practical Conference is presented below.
The Conference reflects the modern state of innovation in education, science, industry and social-economic sphere, from the standpoint of introducing new information technologies.
It is interesting for a wide range of researchers, teachers, graduate students and professionals in the field of innovation and information technologies. ...
Added: May 24, 2018
Boldyrev K., Молчанова А. Д., Простников М. А. et al., Physical Review B: Condensed Matter and Materials Physics 2017 Vol. 96 No. 17 P. 174305-1-174305-11
Copper borate Cu3(BO3)2 is a complex compound with a layered crystallographic structure in which the
Jahn-Teller active and magnetic copper Cu2+ ions occupy 16 nonequivalent positions in the unit cell displaying
controversial magnetic behavior. In this paper, we report on the infrared and Raman spectroscopic studies of
the lattice dynamics and the electronic structure of 3d9 copper states ...
Added: February 8, 2019
Zhumagulov Y., Vyacheslav D. Neverov, Alexander E. Lukyanov et al., Physical Review B: Condensed Matter and Materials Physics 2022 Vol. 105 No. 11 Article 115436
Second-harmonic generation (SHG) is a well-known nonlinear spectroscopy method to probe electronic
structure, specifically, in transition metal dichalcogenide (TMDC) monolayers. This work investigates the
nonlinear dynamics of a strongly excited TMDC monolayer by solving the time evolution equations for the
density matrix. It is shown that the presence of excitons qualitatively changes the nonlinear dynamics leading,
in particular, to ...
Added: August 26, 2022
Teixeira Saraiva T., Vagov A., Cavalcanti P. J. et al., Physical Review Letters 2020 Vol. 125 No. 21 Article 217003
It is well known that superconductivity in quasi-one-dimensional (Q1D) materials is hindered by large fluctuations of the order parameter. They reduce the critical temperature and can even destroy the superconductivity altogether. Here it is demonstrated that the situation changes dramatically when a Q1D pair condensate is coupled to a higher-dimensional stable one, as in recently ...
Added: November 19, 2020
Dyachkova I. G., Mamontov A. V., Monakhov I. et al., Кристаллография 2020 Т. 65 № 4 С. 640-643
Dependences of the resistivity of metal-containing nanocomposite films with molybdenum, hafnium, chromium, vanadium, tungsten and tantalum nanoparticles on the content of the introduced metals have been studied. An increase in the conductivity of diamond-like films (DLFs) with an increase in the metal content is found. Depending on the introduced metal, the concentration dependences of the ...
Added: September 15, 2020
Boldyrev K., Попова М. Н., Optical Materials 2017 Vol. 63 P. 101-104
We report on the first high-resolution optical spectroscopy study of LiYF4:Ho in an external magnetic field. Peculiarities in the hyperfine structure of holmium spectral lines are discussed for the cases H||c and H⊥c (H = 0.53 and 0.87 T). The spectra reveal a strong interaction between crystal-field levels, mediated by Zeeman and hyperfine terms in the Hamiltonian. A ...
Added: February 8, 2019
Boldyrev K., Попова М. Н., Чукалина Е. П. et al., Physical Review B: Condensed Matter and Materials Physics 2017 Vol. 95 No. 12 P. 125131-1-125131-9
We present the results of temperature- and polarization-dependent high-resolution optical spectroscopy studies of DyFe3(BO3)4 performed in spectral ranges 40-300cm-1 and 3000-23000cm-1. The crystal-field (CF) parameters for the Dy3+ ions in the P3121 (P3221) phase of DyFe3(BO3)4 are obtained from calculations based on the analysis of the measured f-f transitions. Recently, quadrupole helix chirality and its ...
Added: February 8, 2019
Boldyrev K., Молчанова А. Д., Кузьмин Н. Н. et al., Low Temperature Physics 2017 Т. 43 № 6 С. 728-731
Проведено комплексное исследование монокристалла CrBO3 методами оптической и длинноволновой спектроскопии в широком диапазоне температур. Даны фактор-групповой и корреляционный анализы фононных мод. Экспериментально методом нарушенного полного внутреннего отражения обнаружены все ИК активные фононы и установлены их частоты. Выявлен магнитный фазовый переход при темпера-туре 6 К. В магнитоупорядоченном состоянии обнаружена анизотропия оптического спектра при поляри-зационных исследованиях в ...
Added: February 8, 2019
Budkov Y., Kolesnikov A. L., Goodwin Z. H. et al., Electrochimica Acta 2018 Vol. 284 P. 346-354
We propose and develop a classical density functional theory for the description of a minor amount of water dissolved in ionic liquid in the vicinity of an electrode. In addition to the electrostatic energy and lattice-gas mixing entropy terms, the utilised grand canonical potential contains several phenomenological terms/parameters that describe short-range interactions between ions of ...
Added: August 3, 2018
Vinogradov A., Dyachkova I. G., Mamontov A. V. et al., Кристаллография 2020 Т. 65 № 6 С. 960-965
The influence of doping with vanadium on the mechanical properties of nanocomposite films deposited on silicon substrates has been investigated. It is found that the material tested is more likely brittle rather than plastic and that the hardness and elastic modulus of an undoped film are somewhat higher than those of vanadium-doped ones. With an ...
Added: September 23, 2020
ФГБНУ "НИИ ПМТ", 2019
Труды содержат представленные на конференцию доклады из вузовских, академических и отраслевых организаций России и стран СНГ (Армении, Азербайджана, Белоруссии, Казахстана, Узбекистана). В опубликованных докладах содержатся новые результаты исследований процессов образования, миграции и эволюции радиационных дефектов в твердых телах, радиационно-технологических методов модифицирования и обработки материалов с целью улучшения их эксплуатационных свойств, эффектов радиационно-стимулированной диффузии, радиационно-индуцированной сегрегации ...
Added: August 16, 2019
Boldyrev K., Романов А., Хаула Е. et al., Journal of the American Ceramic Society 2019 Vol. 102 No. 5 P. 2745-2751
Single crystal of TlCl was doped with NIR photoluminescent univalent bismuth cations by prolonged immersion in liquid bismuth metal. The ion exchange Tl+ + Bi0 ↔ Tl0 + Bi+ at the crystal surface with subsequent Bi+ migration to the bulk are expected to drive the doping process. Contrary with Bi‐doped TlCl crystals, grown by Bridgman method, the ion exchange does ...
Added: February 8, 2019
Boldyrev K., Молчанова А. Д., Ерофеев А. С. et al., Journal of Physics: Conference Series 2017 Vol. 917 No. 072003 P. 1-4
The work presents a study of manganese-doped copper metaborate (Cu, Mn) B2O4 using optical spectroscopy. The temperature of the antiferromagnetic phase transition T-N = 19 K has been defined according to the absorption spectra. Polarization studies (Cu, Mn) B2O4 in isotropic ab-plane show the presence of linear antiferromagnetic dichroism in the magnetically ordered state previously ...
Added: February 8, 2019
Tikhomirova K., Tantardini C., Sukhanova E. et al., The Journal of Physical Chemistry Letters 2020 No. 11 P. 3821-3827
NaCl is one of the simplest compounds and was thought to be well-understood, and yet, unexpected complexities related to it were uncovered at high pressure and in low-dimensional states. Here, exotic hexagonal NaCl thin films on the (110) diamond surface were crystallized in the experiment following a theoretical prediction based on ab initio evolutionary algorithm USPEX. State-of-the-art ...
Added: May 8, 2020
Boldyrev K., Малкин Б. З., Абишев Н. М. et al., Physical Review B: Condensed Matter and Materials Physics 2017 Vol. 96 No. 1 P. 014116-1-014116-13
We construct a distribution function of the strain-tensor components induced by point defects in an elastically anisotropic continuum, which can be used to account quantitatively for many effects observed in different branches of condensed matter physics. Parameters of the derived six-dimensional generalized Lorentz distribution are expressed through the integrals computed over the array of strains. ...
Added: February 8, 2019
Zhukov A., Kryzhanovskaya N., Moiseev E. et al., Физика и техника полупроводников 2020 Т. 54 № 6 С. 570-574
A model is developed that makes it possible to analytically determine the threshold current of a microdisk laser with consideration for its self-heating as a function of the ambient temperature and the microlaser diameter. It is shown that there exists a minimum microdisk diameter determined by self-heating, up to which continuous-wave lasing can be reached ...
Added: September 15, 2020
Kolesnikov A. L., Budkov Y., Gor G., Journal of Physical Chemistry C 2020 Vol. 124 No. 37 P. 20046-20054
Adsorption of fluids in nanoporous media causes mechanical stresses which results in deformation. This phenomenon is ubiquitous and its magnitude depends on the pore size and geometry. Adsorption and adsorption-induced deformation are typically modeled in slit-shape or convex (cylindrical or spherical) pores. However, many porous materials are composed of spherical grains, so that the pores ...
Added: August 13, 2020
Natalia A. Lozing, Maxim G. Gladush, Eremchev I. et al., Physical Review B: Condensed Matter and Materials Physics 2020 Vol. 102 Article 060301
We report the discovery of a GeV-associated phenomenon which is strong (up to an order) stochastic reversible enhancements of photoluminescence intensity in a single GeV diamond synthesized with the high-pressure, high-temperature technique. We were lucky to observe this effect with only one crystal among dozens of similar microdiamonds. Each rise and fall of the intensity ...
Added: February 4, 2021
Babich E. S., Scherbak, S., Asonkeng F. et al., Optical Materials Express 2019 Vol. 9 No. 10 P. 4090-4096
The statistics of hot spots in the ensemble of self-assembled silver nanoislands grown
on the surface of silver-to-sodium ion exchanged glass under hydrogen annealing was studied.
The comparison of the surface enhanced Raman scattering (SERS) performance of the nanoisland
films at different growth stages with the developed model of the hot spots formation revealed that
at the nanoislands coalescence ...
Added: November 9, 2020
Бобров М. А., Блохин А. А., Кузьменков А. Г. et al., Оптика и спектроскопия 2019 Т. 127 № 7 С. 145-149
The results of a study of internal optical losses and current injection efficiency in vertical-emitting lasers of a spectral range of 1.55 µm obtained by sintering plates of high-q Bragg reflectors and the active region on the basis of thin strained InGaAs/InAlGaAs quantum wells have been presented. It has been shown that the proposed design ...
Added: December 9, 2020
Gridchin V., Kotlyar K., Reznik R. et al., Nanotechnology 2021 Vol. 32 No. 33 Article 335604
InGaN nanostructures are among the most promising candidates for visible solid-state lighting
and renewable energy sources. To date, there is still a lack of information about the influence of
the growth conditions on the physical properties of these nanostructures. Here, we extend the
study of InGaN nanowires growth directly on Si substrates by plasma-assisted molecular beam
epitaxy. The results ...
Added: August 30, 2021
Балашова Е. В., Свинарев Ф. Б., Левин А. А. et al., Crystals 2019 Vol. 9 No. 11 P. 573
New single crystals, based on 2-methylbenzimidazole (MBI), of MBI-phosphite (C16H24N4O7P2), MBI-phosphate-1 (C16H24N4O9P2), and MBI-phosphate-2 (C8H16N2O9P2) were obtained by slow evaporation method from a mixture of alcohol solution of MBI crystals and water solution of phosphorous or phosphoric acids. Crystal structures and chemical compositions were determined by single crystal X-ray diffraction (XRD) analysis and confirmed by ...
Added: November 10, 2020