Effect of dopant concentration on the spectroscopic properties in an In3+ doped (0, 1, 2 and 4 mol%) Yb:Tm:LiNbO3 crystal

RSC Advances ◽  
2015 ◽  
Vol 5 (46) ◽  
pp. 36385-36389 ◽  
Author(s):  
Li Dai ◽  
Zhehua Yan ◽  
Shanshan Jiao ◽  
Chao Xu ◽  
Yuheng Xu
Keyword(s):  
Dopant Concentration ◽  
Spectroscopic Properties ◽  
Czochralski Technique ◽  
First Time

A series of Yb:Tm:LiNbO3 crystals with x mol% In3+ ions (x = 0, 1,2 and 4 mol%) were grown by a conventional Czochralski technique for the first time.

Growth, thermal, and spectroscopic properties of a 2.911 μm Yb,Ho:GdYTaO4 laser crystal

CrystEngComm ◽  
2014 ◽  
Vol 16 (48) ◽  
pp. 11007-11012 ◽  
Author(s):  
Renqin Dou ◽  
Qingli Zhang ◽  
Dunlu Sun ◽  
Jianqiao Luo ◽  
Huajun Yang ◽  
...  
Keyword(s):  
Laser Crystal ◽  
Czochralski Method ◽  
Spectroscopic Properties ◽  
First Time

A promising 2.911 μm Yb,Ho:GdYTaO4 laser crystal was grown successfully by the Czochralski method for the first time.

X-ray standing wave investigations of Si dopant incorporation in GaN

2005 ◽  
Vol 892 ◽  
Author(s):  
Michael Siebert ◽  
Th. Schmidt ◽  
J. I. Flege ◽  
J. Zegenhagen ◽  
T.-L. Lee ◽  
...  
Keyword(s):  
Dopant Concentration ◽  
Specific Data ◽  
X Ray ◽  
Site Distribution ◽  
Sapphire Substrates ◽  
Dopant Incorporation ◽  
Radiation Technique ◽  
Si Doped ◽  
Sample Structure ◽  
First Time

AbstractThe synchrotron radiation technique of x-ray standing waves (XSW), which allows to directly obtain structural and element-specific data, was successfully used for the investigation of the dopant site distribution in Si doped GaN films grown on (0001) sapphire substrates for the first time. The Si dopant concentration was chosen to 5×1018 cm-3 and 5×1019 cm-3. The measurements were performed on 300 nm thin doped films deposited on high-quality thick undoped GaN films. With this sample structure, influences of the Si dopant induced decrease of the crystalline quality on the XSW signal are suppressed. The XSW data are compared to those obtained from thick homogeneously doped GaN films. All XSW measurements were performed in (002) backscattering geometry. Independent of the dopant concentration, the results indicate that Si atoms are solely incorporated on substitutional Ga sites.

Synthesis of α-Fluoro-β-lactones and Their Thermal Conversion to 1-Fluoroalkenes

2002 ◽  
Vol 67 (9) ◽  
pp. 1325-1334 ◽  
Author(s):  
Rogelio Ocampo ◽  
William R. Dolbier ◽  
Fabio Zuluaga
Keyword(s):  
Spectroscopic Properties ◽  
Thermal Conversion ◽  
Hydroxy Acids ◽  
Preliminary Results ◽  
First Time

α-Fluoro-β-lactones have been synthesized and isolated for the first time from α-fluoro-β-hydroxy acids by using the couple TsCl/DMAP as lactonization agent. A detailed description of the synthesis and spectroscopic properties of α-fluoro-β-lactones is presented. Preliminary results indicate that thermolysis of these new β-lactones produces 1-fluoroalkenes.

scholarly journals Heat capacity of lithium tungstate single crystal by DSC calorimetry data in the temperature range of 319-997 K

2021 ◽  
Vol 2057 (1) ◽  
pp. 012048
Author(s):  
N I Matskevich ◽  
V N Shlegel ◽  
A A Chernov ◽  
D A Samoshkin ◽  
S V Stankus ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Phase Transitions ◽  
Single Crystal ◽  
Weight Control ◽  
Czochralski Technique ◽  
Temperature Range ◽  
First Time ◽  
Lithium Tungstate ◽  
Dsc Calorimetry ◽  
Calorimetry Data

Abstract The heat capacity of lithium tungstate single crystal (Li2WO4) was measured for the first time in the temperature range of 319-997 K. The experiments were carried out by DSC calorimetry. The Li2WO4 single crystal was first grown by low-temperature-gradient Czochralski technique with weight control. The temperature dependence of Li2WO4 heat capacity in the temperature range 319-997 K was monotonic. According to results of our studies, there were no phase transitions in Li2WO4 in the investigated temperature range.

scholarly journals Thermodynamic properties of single crystals based on lithium tungstate by reaction and DSC calorimetry

2021 ◽  
Vol 2119 (1) ◽  
pp. 012140
Author(s):  
N I Matskevich ◽  
V N Shlegel ◽  
D A Samoshkin ◽  
S V Stankus ◽  
A N Semerikova ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Temperature Gradient ◽  
Single Crystals ◽  
Czochralski Technique ◽  
Formation Enthalpies ◽  
Stabilization Energies ◽  
Mo Content ◽  
First Time ◽  
Lithium Tungstate ◽  
Dsc Calorimetry

Abstract For the first time, single crystals of undoped lithium tungstate and lithium tungstate doped by 1.25% molybdenum were grown by the low-temperature-gradient Czochralski technique. The standard formation enthalpies, lattices enthalpies, stabilization energies, and the heat capacity were determined in the temperature range of 320-997 K. The lattice enthalpy dependence on Mo content was constructed.

A phthalocyanine–subphthalocyanine heterodinuclear dimer: comparison of spectroscopic properties with those of homodinuclear dimers of constituting units

2014 ◽  
Vol 50 (23) ◽  
pp. 3040-3043 ◽  
Author(s):  
Norio Shibata ◽  
Satoru Mori ◽  
Masamichi Hayashi ◽  
Masashi Umeda ◽  
Etsuko Tokunaga ◽  
...  
Keyword(s):  
Spectroscopic Properties ◽  
X Ray ◽  
X Ray Crystallography ◽  
First Time

A phthalocyanine–subphthalocyanine heterodinuclear dimer has been disclosed for the first time with its unique flat-bowl-shaped structure revealed by X-ray crystallography.

Synthesis and luminescent properties of La1−xNdxP5O14 nanocrystals

2014 ◽  
Vol 16 (33) ◽  
pp. 18004-18009 ◽  
Author(s):  
L. Marciniak ◽  
W. Strek ◽  
Y. Guyot ◽  
D. Hreniak
Keyword(s):  
Dopant Concentration ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Spectroscopic Properties ◽  
Branching Ratios ◽  
Luminescence Decay ◽  
The Impact

The impact of dopant concentration on spectroscopic properties of La1−xNdxP5O12 nanocrystals: the luminescence decay profiles – (a); emission spectra – (b); and luminescence branching ratios – (c).

scholarly journals Optical Investigation of Eu3+ Doped Bi12GeO20 (BGO) Crystals

Crystals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 285 ◽  
Author(s):  
M. Kowalczyk ◽  
T.F. Ramazanova ◽  
V.D. Grigoryeva ◽  
V.N. Shlegel ◽  
M. Kaczkan ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Room Temperature ◽  
Transition Probabilities ◽  
Spectroscopic Properties ◽  
Electric Dipole Transition ◽  
Optical Investigation ◽  
Bulk Crystals ◽  
Czochralski Technique ◽  
Uv Excitation ◽  
Transfer Mechanisms

The spectroscopic properties of Eu3+ doped Bi12GeO20 (BGO) sillenite bulk crystals that were grown by the low-thermal-gradient Czochralski technique (LTG Cz) were investigated. The absorption spectra and the emission properties have been measured at room temperature (300 K) and at 10 K. Luminescence was observed both due to the direct Eu3+ ion excitation, as well as under UV excitation due to the energy transfer between Bi3+ and Eu3+ ions. Bi3+ → Eu3+ energy transfer mechanisms in Eu3+:BGO doped host were investigated. The Ωλ parameters, as well as radiative lifetimes, were calculated based upon the Judd-Ofelt formalism. The branching ratios and electric dipole transition probabilities were also determined, based upon the obtained experimental results. Luminescence has been observed from the 5D0,1,2 levels of Eu3+, with emissions from the 5D0 level being the strongest. The strongest observed luminescence band corresponds to the 5D0 → 7F0 transition at 578.7 nm. Reasons for the strong presence of the theoretically forbidden 5D0 → 7F0 emission were investigated.

Photoluminescence in heavily-doped Si(P)

1978 ◽  
Vol 56 (7) ◽  
pp. 814-826 ◽  
Author(s):  
R. R. Parsons
Keyword(s):  
Photoluminescence Spectrum ◽  
Dopant Concentration ◽  
Impurity Band ◽  
Excitation Level ◽  
Excitation Threshold ◽  
Threshold Behaviour ◽  
Band Emission ◽  
Luminescence Peak ◽  
Heavily Doped ◽  
First Time

The photoluminescence spectrum of heavily doped Si(P) has been studied as a function of temperature, excitation level, and impurity concentration. Several new results are observed for the first time, which include: (i) a narrowing of the impurity band luminescence peak when the temperature is increased to about T = 15 K, (ii) a sudden disappearance of the impurity band emission at a certain temperature determined by the dopant concentration, and (iii) an excitation threshold behaviour for the luminescence observed at high excitation level.A new model is introduced to explain the data. In this model, the impurity band undergoes a localized-to-delocalized transition due to a sufficiently large concentration of photocreated carriers.

Spectroscopic properties of SO4 in different molecular and crystalline environments. II. Identification and infrared spectra of Cu3O2SO4 and its hydroxylated derivative

1988 ◽  
Vol 66 (2) ◽  
pp. 337-340 ◽  
Author(s):  
Etalo A. Secco
Keyword(s):  
Infrared Spectra ◽  
Spectroscopic Properties ◽  
First Time ◽  
Strong Contrast

The infrared spectra of Cu3O2SO4, identified for the first time and obtained from three different preparations are reported. The proposed structure of Cu3O2SO4 contains the copper oxysulfate anion [(CuO)2SO4]2− of Cs symmetry with each CuO attached by the Cu to two oxygens of the SO4 group. Of the 21 infrared-active modes predicted for this anion 17 modes are discernible. Its hydroxylated derivative Cu3(OH)4SO4 shows clearly resolved and evenly split peaks of the v3 mode of SO4 in strong contrast to the strong overlap of this mode in its crystalline analog; the frequencies of the remaining SO4 modes stay effectively unchanged.

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