Ligand field and Judd-Ofelt intensity parameters of samarium doped tellurite glass

Neodymium doped tellurite glass have been proven to be one of the most efficient candidates for photonic application. Nd3+ ions are well known excellent as lasing ions at 1.06μm. However, the efficiency of the lasing activity of the Nd3+ doped tellurite glass need for more discussion especially on the contribution of the atom-atom and atom-ligand bonding based on the Judd-Ofelt theory. Therefore, initiative has been taken in this work to determine the laser efficiency by mean of their oscillator strength and Judd-Ofelt parameters. In order to identify the optical behaviour, good quality of Nd doped tellurite glass should firstly be ready. From the results, it is found that the experimental and calculated oscillator strength results of the glass are found varies from 1.157 x 10-6 to 0.804 x 10-6 and from 2.527 x 10-6 to 2.243 x 10-6 respectively with respect to Nd2O3 composition. The small rms deviation ~10% indicates good fit between experimental and calculated oscillator strength. Meanwhile, the Judd-Ofelt intensity parameters with t = 2, 4 and 6 are found to vary with respect to mol% of Nd content. The 4F3/2→4I11/2 transition for 1.06μm emission which is useful for lasers and optical amplification is totally contributed from electric dipole whereas the magnetic dipole shows no effect. Some other results will be discussed in details.

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Structures and Ligand Field Parameters of Sm3+ Doped Tellurite Glass: Gold Nanoparticles Mediation

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.268.67 ◽

2017 ◽

Vol 268 ◽

pp. 67-71

Author(s):

Y.A. Tanko ◽

Md Rahim Sahar ◽

Sib Krishna Ghoshal

Keyword(s):

Gold Nanoparticles ◽

Tellurite Glass ◽

Ligand Field ◽

Electron Microscopic ◽

Au Nps ◽

Bonding Parameter ◽

Resonance Band ◽

Racah Parameters ◽

Doped Glasses ◽

Ligand Field Parameters

Controllable modifications of overall properties of rare-earth doped glasses via gold nanoparticles (Au NPs) mediation prompted gamut research interests. Such glass systems are interesting due to their technological prospects and well as fundamental understanding of surface plasmon resonance effects at metal glass interface responsible for diverse emerging attributes. This motivate us to determine the effects of varying concentration of Au NPs on the structure and ligand field parameters of samarium (Sm3+) doped zinc tellurite glass. Glass samples with composition (79-x)TeO2-20ZnO-1Sm2O3-xAuCl3, where 0 ≤ x ≤ 0.10 mol% are prepared using melt quenching method. X-ray diffraction pattern of all glasses confirmed their amorphous nature. Transmission electron microscopic images verified the existence of Au NPs in a glass matrix matrix with an average size of 10.52 nm. Two surface plasmons resonance band of gold are probed at 652 and 715 nm. Using the UV-Vis absorption spectral data, quantities such as nephelauxetic ratio, bonding parameter and Racah parameters are evaluated. Both bonding parameter and nephelauxetic ratio revealed a reduction with increasing concentration of Au NPs, where decrease in the ionic bonding between Sm3+ and surrounding ligand have clearly indicated an enhancement in the covalency. The values of Racah parameters are decreased as the concentration of Au NPs are increased. The observed reduction in the nephelauxetic function is attributed to the weakening of the localized d-electrons aroused from overlapping d-orbital and ligand orbital. Furthermore, the Raman spectra displayed the structural modification in terms of TeO4 trigonal bipyramidal (tbp) unit, where many TeO4 tbp units are converted into their TeO3 trigonal pyramid (tp) counterparts. Raman bands are found to be located around 102-105 cm-1, 420-424 cm-1, 657-661 cm-1 and 729-736 cm-1. Results are analyzed and compared. Present glass composition is asserted to be useful for the development of photonic devices.

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Optical properties of Eu3+ ions in boro-tellurite glass

Communications in Physics ◽

10.15625/0868-3166/26/1/7916 ◽

2016 ◽

Vol 26 (1) ◽

pp. 25

Author(s):

Ngo Van Tam ◽

Vu Phi Tuyen ◽

Phan Van Do

Keyword(s):

Cross Sections ◽

Tellurite Glass ◽

Transition Probabilities ◽

Emission Spectra ◽

Branching Ratios ◽

Stimulated Emission ◽

Radiative Properties ◽

Phonon Coupling ◽

Intensity Parameters ◽

Electron Phonon Coupling

The excitation, emission spectra and and lifetime of Eu-doped borotellurite glasses (BTe) have been investigated. The sideband phonon energy and electron-phonon coupling strength (g) have been found. The intensity parameters Ωλ were calculated from the emission spectrum. These parameters were used to predict radiative properties such as transition probabilities (AR), calculated branching ratios (βR) and stimulated emission cross-sections (σλp) for 5D0→7HJHFJ transitions.

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The Ligand Fields Characterizations within Erbium-Tellurite Glass Network via Gold Nanoparticles Concentration Variation

Materials Science Forum ◽

10.4028/www.scientific.net/msf.846.137 ◽

2016 ◽

Vol 846 ◽

pp. 137-141

Author(s):

Ezza Syuhada Sazali ◽

M.R. Sahar ◽

R. Arifin ◽

S.K. Ghoshal ◽

Md Supar Rohani

Keyword(s):

Gold Nanoparticles ◽

Tellurite Glass ◽

Glass Network ◽

Average Diameter ◽

Visible Range ◽

Ligand Field ◽

Racah Parameter ◽

Crystal Field Strength ◽

Nanoparticles Concentration ◽

Ligand Fields

Glass samples of composition 79TeO2 – 15PbO – 5PbCl2 – 1Er2O3 – (x)AuCl3 with (0.0 ≤ x ≤ 0.1 mol%) were successfully synthesized by using melt-quenching technique. The impacts of gold nanoparticles (GNPs) concentration in stimulating the ligand field interaction inside the erbium-tellurite glass network were inspected. Amorphous nature of the sample was confirmed through XRD pattern. TEM images display the existence of GNPs with average diameter ~1.24 nm. Optical absorption spectra were recorded in the UV-Visible range. The absorption displays several prominent peaks corresponding to the transitions from the ground state to the excited states of Er3+ ion. The compositional dependence of the ligand parameters in terms of crystal field strength and Racah parameter were determined.

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SPECTROSCOPIC PROPERTIES OF ERBIUM IONS DOPED IN BISMUTH BORO-SILICATE GLASSES

International Journal of Modern Physics Conference Series ◽

10.1142/s2010194513010477 ◽

2013 ◽

Vol 22 ◽

pp. 424-430

Author(s):

SUNIL BHARDWAJ ◽

RAJNI SHUKLA ◽

SUJATA SANGHI ◽

ASHISH AGARWAL ◽

INDER PAL

Keyword(s):

Rare Earth ◽

Emission Cross Section ◽

Branching Ratio ◽

Spectroscopic Properties ◽

Stimulated Emission ◽

Least Square ◽

Radiative Properties ◽

Ligand Field ◽

Intensity Parameters ◽

The Rare Earth

Glasses with composition 20B2O3.(79.5-x)Bi2O3.xSiO2 (10 ≤ x ≤ 40) containing 0.5mol% of Er3+ ions were prepared by melt-quench technique. Optical absorption and fluorescence spectra were recorded at room temperature for all glass samples. Based on the Judd-Offelt theory, spectroscopic properties of Er3+ ions are discussed by changing the host glass compositions. The intensity parameters Ω2 , Ω4 , and Ω6 are determined by applying least square analysis method. The variation of Ω2 and Ω6 with Bi2O3 content has been attributed to changes in the asymmetry of the ligand field at the rare earth ion site and to the changes in the rare earth oxygen (RE-O) covalency. The variation of Ω4 with Bi2O3 content has been attributed to rigidity of the samples. Using these intensity parameters various radiative properties like spontaneous emission probability, branching ratio, radiative life time and stimulated emission cross-section of various emission lines have been evaluated. An intense green luminescence bands with maximum around 516 nm and 536 nm are assigned to the 2H11/2→ 4I15/2 and 4S3/2→ 4I15/2 transitions respectively has been obtained.

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Rule Invention in the Acquisition of Morphology Revisited

Journal of Speech Language and Hearing Research ◽

10.1044/jshr.3103.425 ◽

1988 ◽

Vol 31 (3) ◽

pp. 425-431 ◽

Cited By ~ 7

Author(s):

Stephen M. Camarata ◽

Lisa Erwin

Keyword(s):

Language Acquisition ◽

Active Role ◽

Acoustic Parameters ◽

Impaired Child ◽

Language Impaired ◽

Intensity Parameters ◽

Suprasegmental Features ◽

Acoustic Analyses ◽

Suprasegmental Cues

This paper presents a case study of a language-impaired child who signaled the distinction between English singular and plural using suprasegmental cues rather than the usual segmental form used within the parent language. Acoustic analyses performed within the first study in the paper revealed that the suprasegmental features used to maintain this distinction included various duration, fundamental frequency, and intensity parameters. Acoustic analyses Were also performed on a set of matched two- and four-item plural forms within a second study. The results of these analyses indicated that the same acoustic parameters were used to distinguish two-item plural forms from four-item plural forms. This case of linguistic creativity is offered as further evidence in support of the model of language acquisition that emphasizes the active role children take in the acquisition process. Additionally, the phonological, morphological, and psycholinguistic factors that may contribute to such rule invention are discussed.

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Ligand Field Studies on the Reinecke-Type Complexes with Aniline and Benzylamine

Zeitschrift für Physikalische Chemie ◽

10.1524/zpch.1971.74.1_2.011 ◽

1971 ◽

Vol 74 (1_2) ◽

pp. 11-16 ◽

Cited By ~ 1

Author(s):

I. Gănescu ◽

Margareta Teodorescu ◽

C. I. Lepădatu

Keyword(s):

Field Studies ◽

Ligand Field

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