Konstantin Ivanovskikh - Academia.edu (original) (raw)

Papers by Konstantin Ivanovskikh

Fizika tverdogo tela, 2019

С применением синхротронного излучения ультрафиолетового (УФ), вакуумного ультрафиолетового (ВУФ)... more С применением синхротронного излучения ультрафиолетового (УФ), вакуумного ультрафиолетового (ВУФ) и рентгеновского диапазонов, а также методов импульсной катодолюминесценции (ИКЛ) при температурах 10, 90 и 295 K исследованы спектрально-кинетические характеристики Sr 9 Sc(PO 4)7 : Pr 3+ (1%). Спектры люминесценции содержат три группы полос и линий. В УФ-диапазоне наблюдаются полосы, соответствующие межконфигурационным 5d → 4 f-переходам в ионах Pr 3+. В видимом диапазоне спектра доминирует широкая полоса люминесценции дефектов, а также узкие линии, связанные с внутриконфигурационными 4 f → 4 f-переходами в ионах Pr 3+. При возбуждении электронным пучком (5 Hz) в кинетике затухания 5d → 4 f-люминесценции доминирует основной компонент со временем затухания τ ∼ 17 ns. Кинетика затухания 5d → 4 f-люминесценции при возбуждении высокочастотным (τ ∼ 8 MHz) синхротронным излучением рентгеновского диапазона содержит быстрый компонент (τ ∼ 15 ns) на фоне медленной составляющей µs-диапазона. Наблюдается эффективный безызлучательный перенос энергии от примесных центров к дефектам, а также от матрицы к ионам Pr 3+ и дефектам.

Physics of the Solid State, May 1, 2019

The spectroscopic characteristics and luminescence decay kinetics of Sr 9 Sc(PO 4) 7 :Pr 3+ (1%) ... more The spectroscopic characteristics and luminescence decay kinetics of Sr 9 Sc(PO 4) 7 :Pr 3+ (1%) were investigated using synchrotron radiation of ultraviolet (UV), vacuum ultraviolet (VUV) and X-ray ranges, as well as pulsed cathodoluminescence (PCL) methods at temperatures of 10, 90, and 295 K. The luminescence spectra contain three groups of bands and lines. In the UV range, the observed bands correspond to interconfigurational 5d → 4f transitions in Pr 3+ ions. In the visible spectrum, the wide luminescence band of defects dominates, as well as narrow lines associated with intraconfigurational 4f → 4f transitions in Pr 3+ ions. When excited by an electron beam (5 Hz), the main component with a decay time τ ∼ 17 ns dominates in the decay kinetics of the 5d → 4f luminescence. The decay kinetics of 5d → 4f luminescence upon excitation with highfrequency (τ ∼ 8 MHz) synchrotron radiation of the X-ray range contains a fast component (τ ∼ 15 ns) against the background of the slow component of the μs-range. An effective nonradiative energy transfer is observed from impurity centers to defects, as well as from the host to Pr 3+ ions and defects.

Journal of Luminescence, Oct 1, 2023

Journal of Applied Physics, Mar 14, 2016

Luminescence spectroscopic and temporal dynamic properties of high energy elementary excitations ... more Luminescence spectroscopic and temporal dynamic properties of high energy elementary excitations in CdF 2-CaF 2 superlattices have been studied utilising excitation with vacuum ultraviolet and X-ray synchrotron radiation while comparing the results with those obtained for CdF 2 and CaF 2 bulk crystals. It is shown that the optical properties of the superlattice structures are determined by exciton emission in the CdF 2 monolayers. The experimental manifestations of exciton confinement phenomena are discussed. V

Physics of the Solid State, Dec 15, 2021

A series of co-doped KSrPO 4 :Eu 2+ , Y 3+ phosphors have been prepared through a high-temperatur... more A series of co-doped KSrPO 4 :Eu 2+ , Y 3+ phosphors have been prepared through a high-temperature solid-state reaction at various temperatures. Luminescence spectroscopic characterization allowed to demonstrate that emission spectrum of original KSrPO 4 :Eu 2+ phosphor that is typically dominated by Eu 2+ 4f 6 5d 1 → 4f 7 emission can be significantly modified by co-doping with Y 3+ ions, which results in appearance of a broad defect emission. The latter makes the phosphor potential for WLED application. The Y 3+ co-doping related defect emission was found to get enhanced with the increase of Y 3+ content and synthesis temperature. The nature and peculiarities of the new defect emission are discussed.

Optical Materials, May 1, 2023

Radiation Measurements, May 1, 2019

Photoluminescence properties and relaxation dynamics of electronic excitations in cesium vanadate... more Photoluminescence properties and relaxation dynamics of electronic excitations in cesium vanadate CsVO 3 have been studied upon pulse laser excitation in the wide temperature range of 6.5-300 K. A vibronic structure observed in low-temperature PL spectra is considered and interpreted. Peculiarities of luminescence relaxation dynamics and emission spectra of CsVO 3 along with the appearance of the vibronic structure are explained in terms of strong electron-phonon coupling of excited electronic states and centrosymmetric vibrational modes in [VO 4 ] 3center. A new approach in an interpretation of luminescence processes in vanadates is demonstrated.

Physics of the Solid State, May 1, 2019

The luminescent characteristics of K 3 LuSi 2 O 7 :Pr 3+ (1%), which is a promising optical mater... more The luminescent characteristics of K 3 LuSi 2 O 7 :Pr 3+ (1%), which is a promising optical material for the use as a scintillator, have been studied using a set of techniques. The luminescence spectra of K 3 Lu-Si 2 O 7 :Pr 3+ (1%) contain two bands in the UV-range with peaks at 284 and 330 nm, which correspond intraconfigurational 5d → 4f transitions in the Pr 3+ ions. The radiation in the visible and near IR range (480-850 nm) has been represented by the intraconfigurational 4f → 4f transitions. The kinetics of 5d → 4f-luminescence contains a build-up stage (τ rise ∼ 7-12 ns), nonexponential decay stage (τ 1/2 ∼ 60 ns), and a slow component of the μs-range when excited by high-frequency (∼8 MHz) synchrotron radiation of the X-ray range. The fast component of the decay (τ = 54 ns) dominates in the decay kinetics of luminescence along with the build-up stage while the contribution of the μs decay component is less than 0.5% at the excitation by an pulse electron beam (5Hz). The excitation spectra of d-f-and f-f-photoluminescence in the ultraviolet and vacuum ultraviolet range that are measured using synchrotron radiation reveal features that are caused by both intracenter transitions and processes related to the energy transfer from the intrinsic electronic excitations to the impurity center.

Journal of Physical Chemistry Letters, Feb 27, 2017

Materials that luminesce after excitation with ionizing radiation are extensively applied in phys... more Materials that luminesce after excitation with ionizing radiation are extensively applied in physics, medicine, security, and industry. Lanthanide dopants are known to trigger crystals scintillation through their fast d-f emissions; the same is true for other important applications as lasers or phosphors for lighting. However, this ability can be seriously compromised by unwanted anomalous emissions often found with the most common lanthanide activators. We report high resolution X-ray excited optical (IR to UV) luminescence spectra of CaF 2 :Yb and SrF 2 :Yb samples excited at 8949 eV and 80 K. Ionizing radiation excites the known anomalous emission of ytterbium in the CaF 2 host but not in the SrF 2 host. Wavefunction-based ab initio calculations of host-to-dopant electron transfer and Yb 2+ /Yb 3+ intervalence charge transfer explain the difference. The model also explains the lack of anomalous emission in Ybdoped SrF 2 excited by VUV radiation.

Journal of Physical Chemistry Letters, Oct 7, 2013

ABSTRACT We report estimations of the thermalization length and the diffusion coefficient of phot... more ABSTRACT We report estimations of the thermalization length and the diffusion coefficient of photogenerated carriers in the insulator LiYF4 as a function of their initial energy. Combining modeling of electron?phonon interaction and the detailed analysis of the kinetic response of fluorescent center Ce3+ under vacuum ultraviolet excitation, the thermalization length is obtained as a function of the initial kinetic energy of the electron. This parameter is essential for the description of the carrier recombination in the case of nonideal plasma conditions, where electrons and holes are strongly correlated. This approach also demonstrates the effect of a complicated structure of electronic band on the thermalization process, which impacts the complex nonproportionality response of materials under ionizing radiation excitation.

New Journal of Chemistry, 2020

Phase pure BaF2 doped with Ce3+ (0.1%) nanocrystals are synthesized using an ionic liquid (IL) ([... more Phase pure BaF2 doped with Ce3+ (0.1%) nanocrystals are synthesized using an ionic liquid (IL) ([C4mim][BF4]) assisted solvothermal method where the IL is not only used as a reaction medium and a capping agent, but also as a reaction partner.

Optical Materials, May 1, 2018

Pr 3þ 5d-4f transitions Host-to-impurity energy transfer UV-VUV spectroscopy Synchrotron radiatio... more Pr 3þ 5d-4f transitions Host-to-impurity energy transfer UV-VUV spectroscopy Synchrotron radiation X-ray and cathode ray excitation a b s t r a c t LiLa 9 (SiO 4) 6 O 2 (LLSO) crystals doped with Pr 3þ ions were grown using the slow cooling flux method. The crystals were characterized by means of luminescence and optical spectroscopy and luminescence decay measurements upon excitation in UV, VUV and X-ray range including using synchrotron radiation sources. The spectroscopic data revealed the presence Pr 3þ 5d44f emission and excitation bands related to Pr 3þ ions replacing La 3þ in two nonequivalent positions, and features related Pr 3þ 4f/4f emission. The photon cascade emission is not observed in LLSO:Pr 3þ , since Pr 3þ 1 S 0 state is above the bottom of 4f n-1 5d mixed-states band. Apart from the emission features related to Pr 3þ , a defect-related emission was observed upon UV, VUV, and ionizing radiation excitation. Presence of the defects was shown with thermoluminescence measurements and suggested to be the main reason for suppression the 5d/4f emission. Peculiarities of host-to-impurity energy transfer are analyzed and discussed.

Journal of Luminescence, Aug 1, 2014

The double phosphate K 3 Lu (PO 4) 2 doped with Pr 3 þ ions was prepared by solid-state reaction.... more The double phosphate K 3 Lu (PO 4) 2 doped with Pr 3 þ ions was prepared by solid-state reaction. The material obtained was characterized by X-ray powder diffraction (XRPD). The luminescence spectroscopy and the excited state dynamics of this material were studied for the first time upon excitation with UV-VUV synchrotron radiation (SR). The material has shown efficient and fast Pr 3 þ 5d-4f emission upon both intra-center and band-gap excitation. A strong dependence of the luminescence spectra as well as the decay kinetics on the temperature was observed due to crystallographic structural phase changes of the K 3 Lu (PO 4) 2 host.

Journal of Luminescence, May 1, 2010

This article appeared in a journal published by Elsevier. The attached copy is furnished to the a... more This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are

Journal of Luminescence, Aug 1, 2023

Fizika tverdogo tela, 2019

С применением комплекса методик исследованы люминесцентные характеристики K 3 LuSi 2 O7 : Pr 3+ (... more С применением комплекса методик исследованы люминесцентные характеристики K 3 LuSi 2 O7 : Pr 3+ (1%), перспективного оптического материала для использования в качестве сцинтиллятора. Спектры люминесценции K 3 LuSi 2 O7 : Pr 3+ (1%) содержат две полосы в УФ-диапазоне с максимумами 284 и 330 nm, соответствующих межконфигурационным переходам 5d → 4 f в ионах Pr 3+. Излучение в видимом и ближнем ИК-диапазоне (480−850 nm) представлено внутриконфигурационными 4 f → 4 f-переходами. Кинетика 5d → 4 f-люминесценции при возбуждении высокочастотным (∼ 8 MHz) синхротронным излучением рентгеновского диапазона содержит стадию разгорания (τ rise ∼ 7−12 ns), неэкспоненциальное затухание (τ 1/2 ∼ 60 ns) и медленную составляющую µs-диапазона. При возбуждении электронным пучком (5 Hz) в кинетике люминесценции наряду со стадией разгорания преобладает быстрая составляющая затухания (τ = 54 ns), вклад µs-составляющей составляет менее 0.5%. Спектры возбуждения d− f-и f − f-фотолюминесценции в ультрафиолетовом и вакуумном ультрафиолетовом диапазоне, измеренные с применением синхротронного излучения, выявляют особенности, связанные как с внутрицентровыми переходами, так и с процессами передачи энергии собственных электронных возбуждений к примесному центру. Работа выполнена при частичной поддержке Министерства образования и науки Российской Федерации (базовая часть госзадания, проект № 3.8302.2017/8.9), постановления № 211 Правительства Российской Федерации (контракт № 02.A03.21.0006), COST Action TD1401 " FAST" и проекта № RFMEFI62117X0012.

Journal of physics, May 4, 2017

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licenc... more Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

Journal of Physics: Condensed Matter, Nov 9, 2012

Chemical Physics Letters, Apr 1, 2013

Nanocrystalline X2 lutetium oxyorthosilicate (X2-Lu 2 SiO 5) doped with Pr 3+ was synthesized by ... more Nanocrystalline X2 lutetium oxyorthosilicate (X2-Lu 2 SiO 5) doped with Pr 3+ was synthesized by the solgel route. The product was characterised with X-ray diffraction and transmission electron microscopy to confirm the crystal structure and analyse the morphology on the nanoscale. The luminescence spectroscopy and the excited state dynamics were investigated by time-resolved VUV spectroscopy using synchrotron radiation. Fast and efficient host-to-impurity energy transfer was observed. The temperature dependence of the decay dynamics was investigated. In view of a potential application as a scintillator, the X-ray excited luminescence of the X2-Lu 2 SiO 5 nanopowder was studied. Excitation and relaxation processes occurring in nanocrystalline Lu 2 SiO 5 :Pr 3+ are analysed and discussed.

Fizika tverdogo tela, 2019

С применением синхротронного излучения ультрафиолетового (УФ), вакуумного ультрафиолетового (ВУФ)... more С применением синхротронного излучения ультрафиолетового (УФ), вакуумного ультрафиолетового (ВУФ) и рентгеновского диапазонов, а также методов импульсной катодолюминесценции (ИКЛ) при температурах 10, 90 и 295 K исследованы спектрально-кинетические характеристики Sr 9 Sc(PO 4)7 : Pr 3+ (1%). Спектры люминесценции содержат три группы полос и линий. В УФ-диапазоне наблюдаются полосы, соответствующие межконфигурационным 5d → 4 f-переходам в ионах Pr 3+. В видимом диапазоне спектра доминирует широкая полоса люминесценции дефектов, а также узкие линии, связанные с внутриконфигурационными 4 f → 4 f-переходами в ионах Pr 3+. При возбуждении электронным пучком (5 Hz) в кинетике затухания 5d → 4 f-люминесценции доминирует основной компонент со временем затухания τ ∼ 17 ns. Кинетика затухания 5d → 4 f-люминесценции при возбуждении высокочастотным (τ ∼ 8 MHz) синхротронным излучением рентгеновского диапазона содержит быстрый компонент (τ ∼ 15 ns) на фоне медленной составляющей µs-диапазона. Наблюдается эффективный безызлучательный перенос энергии от примесных центров к дефектам, а также от матрицы к ионам Pr 3+ и дефектам.

Physics of the Solid State, May 1, 2019

The spectroscopic characteristics and luminescence decay kinetics of Sr 9 Sc(PO 4) 7 :Pr 3+ (1%) ... more The spectroscopic characteristics and luminescence decay kinetics of Sr 9 Sc(PO 4) 7 :Pr 3+ (1%) were investigated using synchrotron radiation of ultraviolet (UV), vacuum ultraviolet (VUV) and X-ray ranges, as well as pulsed cathodoluminescence (PCL) methods at temperatures of 10, 90, and 295 K. The luminescence spectra contain three groups of bands and lines. In the UV range, the observed bands correspond to interconfigurational 5d → 4f transitions in Pr 3+ ions. In the visible spectrum, the wide luminescence band of defects dominates, as well as narrow lines associated with intraconfigurational 4f → 4f transitions in Pr 3+ ions. When excited by an electron beam (5 Hz), the main component with a decay time τ ∼ 17 ns dominates in the decay kinetics of the 5d → 4f luminescence. The decay kinetics of 5d → 4f luminescence upon excitation with highfrequency (τ ∼ 8 MHz) synchrotron radiation of the X-ray range contains a fast component (τ ∼ 15 ns) against the background of the slow component of the μs-range. An effective nonradiative energy transfer is observed from impurity centers to defects, as well as from the host to Pr 3+ ions and defects.

Journal of Luminescence, Oct 1, 2023

Journal of Applied Physics, Mar 14, 2016

Luminescence spectroscopic and temporal dynamic properties of high energy elementary excitations ... more Luminescence spectroscopic and temporal dynamic properties of high energy elementary excitations in CdF 2-CaF 2 superlattices have been studied utilising excitation with vacuum ultraviolet and X-ray synchrotron radiation while comparing the results with those obtained for CdF 2 and CaF 2 bulk crystals. It is shown that the optical properties of the superlattice structures are determined by exciton emission in the CdF 2 monolayers. The experimental manifestations of exciton confinement phenomena are discussed. V

Physics of the Solid State, Dec 15, 2021

A series of co-doped KSrPO 4 :Eu 2+ , Y 3+ phosphors have been prepared through a high-temperatur... more A series of co-doped KSrPO 4 :Eu 2+ , Y 3+ phosphors have been prepared through a high-temperature solid-state reaction at various temperatures. Luminescence spectroscopic characterization allowed to demonstrate that emission spectrum of original KSrPO 4 :Eu 2+ phosphor that is typically dominated by Eu 2+ 4f 6 5d 1 → 4f 7 emission can be significantly modified by co-doping with Y 3+ ions, which results in appearance of a broad defect emission. The latter makes the phosphor potential for WLED application. The Y 3+ co-doping related defect emission was found to get enhanced with the increase of Y 3+ content and synthesis temperature. The nature and peculiarities of the new defect emission are discussed.

Optical Materials, May 1, 2023

Radiation Measurements, May 1, 2019

Photoluminescence properties and relaxation dynamics of electronic excitations in cesium vanadate... more Photoluminescence properties and relaxation dynamics of electronic excitations in cesium vanadate CsVO 3 have been studied upon pulse laser excitation in the wide temperature range of 6.5-300 K. A vibronic structure observed in low-temperature PL spectra is considered and interpreted. Peculiarities of luminescence relaxation dynamics and emission spectra of CsVO 3 along with the appearance of the vibronic structure are explained in terms of strong electron-phonon coupling of excited electronic states and centrosymmetric vibrational modes in [VO 4 ] 3center. A new approach in an interpretation of luminescence processes in vanadates is demonstrated.

Physics of the Solid State, May 1, 2019

The luminescent characteristics of K 3 LuSi 2 O 7 :Pr 3+ (1%), which is a promising optical mater... more The luminescent characteristics of K 3 LuSi 2 O 7 :Pr 3+ (1%), which is a promising optical material for the use as a scintillator, have been studied using a set of techniques. The luminescence spectra of K 3 Lu-Si 2 O 7 :Pr 3+ (1%) contain two bands in the UV-range with peaks at 284 and 330 nm, which correspond intraconfigurational 5d → 4f transitions in the Pr 3+ ions. The radiation in the visible and near IR range (480-850 nm) has been represented by the intraconfigurational 4f → 4f transitions. The kinetics of 5d → 4f-luminescence contains a build-up stage (τ rise ∼ 7-12 ns), nonexponential decay stage (τ 1/2 ∼ 60 ns), and a slow component of the μs-range when excited by high-frequency (∼8 MHz) synchrotron radiation of the X-ray range. The fast component of the decay (τ = 54 ns) dominates in the decay kinetics of luminescence along with the build-up stage while the contribution of the μs decay component is less than 0.5% at the excitation by an pulse electron beam (5Hz). The excitation spectra of d-f-and f-f-photoluminescence in the ultraviolet and vacuum ultraviolet range that are measured using synchrotron radiation reveal features that are caused by both intracenter transitions and processes related to the energy transfer from the intrinsic electronic excitations to the impurity center.

Journal of Physical Chemistry Letters, Feb 27, 2017

Materials that luminesce after excitation with ionizing radiation are extensively applied in phys... more Materials that luminesce after excitation with ionizing radiation are extensively applied in physics, medicine, security, and industry. Lanthanide dopants are known to trigger crystals scintillation through their fast d-f emissions; the same is true for other important applications as lasers or phosphors for lighting. However, this ability can be seriously compromised by unwanted anomalous emissions often found with the most common lanthanide activators. We report high resolution X-ray excited optical (IR to UV) luminescence spectra of CaF 2 :Yb and SrF 2 :Yb samples excited at 8949 eV and 80 K. Ionizing radiation excites the known anomalous emission of ytterbium in the CaF 2 host but not in the SrF 2 host. Wavefunction-based ab initio calculations of host-to-dopant electron transfer and Yb 2+ /Yb 3+ intervalence charge transfer explain the difference. The model also explains the lack of anomalous emission in Ybdoped SrF 2 excited by VUV radiation.

Journal of Physical Chemistry Letters, Oct 7, 2013

ABSTRACT We report estimations of the thermalization length and the diffusion coefficient of phot... more ABSTRACT We report estimations of the thermalization length and the diffusion coefficient of photogenerated carriers in the insulator LiYF4 as a function of their initial energy. Combining modeling of electron?phonon interaction and the detailed analysis of the kinetic response of fluorescent center Ce3+ under vacuum ultraviolet excitation, the thermalization length is obtained as a function of the initial kinetic energy of the electron. This parameter is essential for the description of the carrier recombination in the case of nonideal plasma conditions, where electrons and holes are strongly correlated. This approach also demonstrates the effect of a complicated structure of electronic band on the thermalization process, which impacts the complex nonproportionality response of materials under ionizing radiation excitation.

New Journal of Chemistry, 2020

Phase pure BaF2 doped with Ce3+ (0.1%) nanocrystals are synthesized using an ionic liquid (IL) ([... more Phase pure BaF2 doped with Ce3+ (0.1%) nanocrystals are synthesized using an ionic liquid (IL) ([C4mim][BF4]) assisted solvothermal method where the IL is not only used as a reaction medium and a capping agent, but also as a reaction partner.

Optical Materials, May 1, 2018

Pr 3þ 5d-4f transitions Host-to-impurity energy transfer UV-VUV spectroscopy Synchrotron radiatio... more Pr 3þ 5d-4f transitions Host-to-impurity energy transfer UV-VUV spectroscopy Synchrotron radiation X-ray and cathode ray excitation a b s t r a c t LiLa 9 (SiO 4) 6 O 2 (LLSO) crystals doped with Pr 3þ ions were grown using the slow cooling flux method. The crystals were characterized by means of luminescence and optical spectroscopy and luminescence decay measurements upon excitation in UV, VUV and X-ray range including using synchrotron radiation sources. The spectroscopic data revealed the presence Pr 3þ 5d44f emission and excitation bands related to Pr 3þ ions replacing La 3þ in two nonequivalent positions, and features related Pr 3þ 4f/4f emission. The photon cascade emission is not observed in LLSO:Pr 3þ , since Pr 3þ 1 S 0 state is above the bottom of 4f n-1 5d mixed-states band. Apart from the emission features related to Pr 3þ , a defect-related emission was observed upon UV, VUV, and ionizing radiation excitation. Presence of the defects was shown with thermoluminescence measurements and suggested to be the main reason for suppression the 5d/4f emission. Peculiarities of host-to-impurity energy transfer are analyzed and discussed.

Journal of Luminescence, Aug 1, 2014

The double phosphate K 3 Lu (PO 4) 2 doped with Pr 3 þ ions was prepared by solid-state reaction.... more The double phosphate K 3 Lu (PO 4) 2 doped with Pr 3 þ ions was prepared by solid-state reaction. The material obtained was characterized by X-ray powder diffraction (XRPD). The luminescence spectroscopy and the excited state dynamics of this material were studied for the first time upon excitation with UV-VUV synchrotron radiation (SR). The material has shown efficient and fast Pr 3 þ 5d-4f emission upon both intra-center and band-gap excitation. A strong dependence of the luminescence spectra as well as the decay kinetics on the temperature was observed due to crystallographic structural phase changes of the K 3 Lu (PO 4) 2 host.

Journal of Luminescence, May 1, 2010

This article appeared in a journal published by Elsevier. The attached copy is furnished to the a... more This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are

Journal of Luminescence, Aug 1, 2023

Fizika tverdogo tela, 2019

С применением комплекса методик исследованы люминесцентные характеристики K 3 LuSi 2 O7 : Pr 3+ (... more С применением комплекса методик исследованы люминесцентные характеристики K 3 LuSi 2 O7 : Pr 3+ (1%), перспективного оптического материала для использования в качестве сцинтиллятора. Спектры люминесценции K 3 LuSi 2 O7 : Pr 3+ (1%) содержат две полосы в УФ-диапазоне с максимумами 284 и 330 nm, соответствующих межконфигурационным переходам 5d → 4 f в ионах Pr 3+. Излучение в видимом и ближнем ИК-диапазоне (480−850 nm) представлено внутриконфигурационными 4 f → 4 f-переходами. Кинетика 5d → 4 f-люминесценции при возбуждении высокочастотным (∼ 8 MHz) синхротронным излучением рентгеновского диапазона содержит стадию разгорания (τ rise ∼ 7−12 ns), неэкспоненциальное затухание (τ 1/2 ∼ 60 ns) и медленную составляющую µs-диапазона. При возбуждении электронным пучком (5 Hz) в кинетике люминесценции наряду со стадией разгорания преобладает быстрая составляющая затухания (τ = 54 ns), вклад µs-составляющей составляет менее 0.5%. Спектры возбуждения d− f-и f − f-фотолюминесценции в ультрафиолетовом и вакуумном ультрафиолетовом диапазоне, измеренные с применением синхротронного излучения, выявляют особенности, связанные как с внутрицентровыми переходами, так и с процессами передачи энергии собственных электронных возбуждений к примесному центру. Работа выполнена при частичной поддержке Министерства образования и науки Российской Федерации (базовая часть госзадания, проект № 3.8302.2017/8.9), постановления № 211 Правительства Российской Федерации (контракт № 02.A03.21.0006), COST Action TD1401 " FAST" и проекта № RFMEFI62117X0012.

Journal of physics, May 4, 2017

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licenc... more Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

Journal of Physics: Condensed Matter, Nov 9, 2012

Chemical Physics Letters, Apr 1, 2013

Nanocrystalline X2 lutetium oxyorthosilicate (X2-Lu 2 SiO 5) doped with Pr 3+ was synthesized by ... more Nanocrystalline X2 lutetium oxyorthosilicate (X2-Lu 2 SiO 5) doped with Pr 3+ was synthesized by the solgel route. The product was characterised with X-ray diffraction and transmission electron microscopy to confirm the crystal structure and analyse the morphology on the nanoscale. The luminescence spectroscopy and the excited state dynamics were investigated by time-resolved VUV spectroscopy using synchrotron radiation. Fast and efficient host-to-impurity energy transfer was observed. The temperature dependence of the decay dynamics was investigated. In view of a potential application as a scintillator, the X-ray excited luminescence of the X2-Lu 2 SiO 5 nanopowder was studied. Excitation and relaxation processes occurring in nanocrystalline Lu 2 SiO 5 :Pr 3+ are analysed and discussed.