28 Result(s)

Article

Lithium Rare-Earth Fluorides as Photonic Materials: 2. Some Physical, Spectroscopic, and Lasing Characteristics

We review the physical properties of crystalline LiRF₄ (R = Y, Gd–Lu) hosts and analyze progress in the application of rare-earth-activated LiRF₄ crystals in quantum electronics. Particular attention is paid to r...

V. V. Semashko, S. L. Korableva, P. P. Fedorov in Inorganic Materials (2022)

Article

Lithium Rare-Earth Fluorides As Photonic Materials: 1. Physicochemical Characterization

LiRF₄ lithium rare-earth (RE) fluorides existing in the LiF–RF₃ systems are important laser materials. This review examines phase equilibria in the LiF–RF₃ systems, the structure of the LiRF₄ compounds, and disti...

P. P. Fedorov, V. V. Semashko, S. L. Korableva in Inorganic Materials (2022)

Article

Spectral-Kinetic Properties and Energy Transfer in Nanoparticles of Y_0.5–xCe_0.5Tb_xF₃ Solid Solution

Crystalline nanoparticles of Y_0.5–xCe_0.5Tb_xF₃, doped with various concentrations (x = 0, 0.005, 0.01, 0.05, 0.1, 0.15, and 0.2) of Tb³⁺ ions were synthesized by co-precipitation. The crystal structure and chemica...

A. S. Nizamutdinov, E. I. Madirov, E. V. Lukinova… in Journal of Applied Spectroscopy (2020)

Article

The comparison of Pr³⁺:LaF₃ and Pr³⁺:LiYF₄ luminescent nano- and microthermometer performances

In the present work, we make a comparison of Pr³⁺:LaF₃ and Pr³⁺:LiYF₄ luminescent nano- and microthermometer performances. We studied Pr³⁺:LaF₃ nanoparticles, synthesized via co-precipitation method (further Pr³⁺

M. S. Pudovkin, S. L. Korableva, D. A. Koryakovtseva… in Journal of Nanoparticle Research (2019)

Article

Luminescence of GdF₃:Pr:Yb and YF₃:Pr:Yb Solid Solutions Synthesized by Crystallization from the Melt

Spectral and luminescence characteristics of GdF₃:Pr:Yb and YF₃:Pr:Yb solid solutions synthesized by crystallization from the melt were investigated. Down-conversion luminescence of Yb³⁺ in the region of ²F_5/2 →

A. S. Nizamutdinov, S. V. Kuznetsov, V. A. Konyushkin… in Journal of Applied Spectroscopy (2019)

Article

Synthesis and Luminescence of Sr_{1– x – y}Yb_xEu_yF_{2+ x + y} Solid Solutions for Photonics

Single-phase Sr_{1– x – y}Yb_xEu_yF_{2+ x + y} solid solutions with an average particle size near 90 nm have been synthesized via co-precipitation from aqueous solutions, followed by high-temperature annealing. Efficient...

S. V. Kuznetsov, A. S. Nizamutdinov, V. Yu. Proydakova… in Inorganic Materials (2019)

Article

Optical Method of Measuring the Temperature of Fluoride Crystals Activated by Yb³⁺ and Tm³⁺ Ions

The fluorescence intensities ratio (FIR) method is applied for measuring the temperature inside the luminescent LiY_0.8Yb_0.2F₄:Tm³⁺ crystal. The obtained results are used for monitoring of the sample temperature i...

B. N. Kazakov, O. G. Goriev, A. R. Khadiev, S. L. Korableva… in Physics of the Solid State (2019)

Article

Cross Sections, Transition Intensities, and Laser Generation at the ³P₁ → ³H₅ Transition of LiY_0.3Lu_0.7F₄:Pr³⁺ Crystal

Lasing and spectroscopic properties of an LiY_0.3Lu_0.7F₄:Pr³⁺ crystal grown by the Bridgman–Stockbarger method were investigated in detail. Absorption and luminescence spectra were recorded using polarized light. ...

A. S. Nizamutdinov, O. S. Morozov, S. L. Korableva… in Journal of Applied Spectroscopy (2019)

Article

Investigation of Ce³⁺ Impurity Centers in UV Active Media Ce:LiCaAlF₆ and Ce:LiSr_0.8Ca_0.2AlF₆

Fluoride crystals with the colquiriite structure LiCaAlF₆ doped with Ce³⁺ ions are used as active media for lasers of ultraviolet spectral range with advantages of laser wavelength tuning range and no photoinduce...

A. A. Shavelev, A. S. Nizamutdinov, V. V. Semashko… in Physics of the Solid State (2019)

Article

Phase Equilibria in LiYF₄–LiLuF₄ System and Heat Conductivity of LiY_1–xLu _x F₄ Single Crystals

Single crystals of LiY_1–xLu _x F₄ (x = 0, 0.25, 0.5, 0.65, 0.9) solid solution were grown by Bridgman–Stockbarger technique. Melting points determined by DSC monotonically varied ...

V. V. Semashko, S. L. Korableva… in Russian Journal of Inorganic Chemistry (2018)

Article

Photoinduced toxicity of PrF₃ and LaF₃ nanoparticles

PrF₃ and LaF₃ nanoparticles were synthesized by the hydrothermal method. The size distribution of these nanoparticles in the colloidal solution produced was studied by photon correlation spectroscopy. The mean di...

M. S. Pudovkin, P. V. Zelenikhin, A. O. Krasheninnikova… in Optics and Spectroscopy (2016)

Article

Analysis of excitation mechanisms of Ho³⁺ upconversion luminescence in Ho³⁺:LiYbF₄ (0.2 at %) crystal via photographs of its longitudinal cross sections and via spectral and kinetic characteristics

The results of a complex analysis of the excitation mechanisms of the up conversion luminescence of Ho³⁺:LiYbF₄ (0.2 at %) crystal are presented. The spatial distribution of the upconversion luminescence intensit...

B. N. Kazakov, A. V. Mikheev, O. G. Goriev, S. L. Korableva… in Optics and Spectroscopy (2016)

Article

Room-temperature ferromagnetism in cerium dioxide powders

Room-temperature ferromagnetism is detected in a CeO₂ powder with a grain size of about 35 nm and a low (<0.1 at %) manganese and iron content. The ferromagnetism in a CeO₂ sample with a submicron crystallite siz...

R. M. Rakhmatullin, V. V. Pavlov… in Journal of Experimental and Theoretical Ph… (2015)

Article

Photoconductivity and photodielectric effect in LiY_{1 − x} Lu _x F₄ crystals doped with Ce³⁺ and Yb³⁺ ions

Time and spectral dependences of the dielectric permittivity of the LiY_{1 − x} Lu _x F₄ (x = 0, 0.5, and 1) crystals doped with Ce³⁺ and co-doped with Yb³⁺ i...

V. V. Pavlov, V. V. Semashko, R. M. Rakhmatullin… in Optics and Spectroscopy (2014)

Article

Investigation of gain characteristics in mixed crystals LiMeF₄ (Me = Y, Lu, Yb) doped by Ce³⁺ ions

Differential gain spectra in the range 295–335 nm were measured in crystals of scheelite structure LiY_{1 − x} Lu _x F₄ (x = 0–1), doped by Ce³⁺ ions. It is shown tha...

A. S. Nizamutdinov, L. A. Nurtdinova, V. V. Semashko… in Optics and Spectroscopy (2014)

Article

Investigation of the photoionization of Ce³⁺ ions in a YAG crystal by microwave resonance technique

The kinetic and spectral characteristics of the complex dielectric constant of a Ce: YAG crystal under laser irradiation in 250–275 nm spectral range are investigated. The lifetimes of free charge carriers and...

V. V. Pavlov, V. V. Semashko, R. M. Rakhmatullin, V. N. Efimov… in JETP Letters (2013)

Article

New all-solid-state tunable UV Ce³⁺, Yb³⁺:LiY_0.4Lu_0.6F₄ laser

Here we report laser test results of the new UV solid-state active medium based on a Ce³⁺, Yb³⁺:LiY_0.4Lu_0.6F₄ mixed crystal pumped by radiation from Ce:LiCAF laser. The 10-Hz pulse repetition rate Ce³⁺, Yb³⁺:LiY_0...

L. A. Nurtdinova, V. V. Semashko, O. R. Akhtyamov, S. L. Korableva… in JETP Letters (2013)

Article

Formation of a stable bivalent state of Yb ions in Na₄Y₆F₂₂:Ce³⁺, Yb³⁺ crystal under intense UV irradiation

The evolution dynamics of absorption spectra induced in samples of Na₄Y₆F₂₂:Ce³⁺, Yb³⁺ crystal by radiation resonant with 4f-5d transitions of Ce³⁺ ions was studied and analyzed. It was found that at least two ty...

D. I. Tselischev, A. K. Naumov, E. Yu. Tselischeva… in Optics and Spectroscopy (2011)

Article

On the distribution coefficient of Ce³⁺ ions in LiF-LuF₃-YF₃ solid-solution crystals

The optimum ratio of the numbers of the Y³⁺ and Lu³⁺ ions in LiF-LuF₃-YF₃ solid solutions at which the distribution (introduction) coefficient of Ce³⁺ ions is three to five times larger than that in LiYF₄ and LiL...

A. S. Nizamutdinov, V. V. Semashko, A. K. Naumov, V. N. Efimov… in JETP Letters (2010)

Article

Thermal conductivity of crystals formed by fluoritelike phases in MF-RF₃ systems (M = Li, Na, and K, R = Rare Earth)

P. A. Popov, P. P. Fedorov, V. V. Semashko, S. L. Korableva… in Doklady Physics (2009)