Absorbance and Fluorescence Spectral Analysis of Sm3+ Ions Doped Bismuth Boro-Silicate Glasses

2012 ◽  
Vol 585 ◽  
pp. 279-283 ◽  
Author(s):  
Sunil Bhardwaj ◽  
Rajni Shukla ◽  
Sujata Sanghi ◽  
Ashish Agarwal ◽  
Inder Pal
Keyword(s):  
Transition Probabilities ◽  
Transition Probability ◽  
Branching Ratio ◽  
Life Time ◽  
Radiative Transition ◽  
Stimulated Emission ◽  
Radiative Properties ◽  
Potential Candidate ◽  
Borosilicate Glasses ◽  
Intensity Parameters

Glasses having compositions 20B2O3.(79.5-x)Bi2O3.xSiO2(10 ≤ x ≤ 40) doped with 0.5 mol% of Sm3+ions were prepared by melt quench technique. The amorphous nature of the glasses was confirmed by X-ray diffraction studies. The spectroscopic properties of Sm3+ions in bismuth borosilicate glasses as a function of bismuth oxide were investigated using optical absorption and fluorescence spectra. The Judd-Ofelt theory has been employed to calculate transitions probability from the data of absorption cross-section of several f-f transitions. The intensity parameters Ω2is related to the symmetry of glass hosts, where as the parameter Ω6is inversely proportional to the rare earth oxygen (RE-O) covalency. The variation of Ω4with Bi2O3content has been attributed to rigidity of the samples. Using the Judd Ofelt intensity parameters the other radiative properties like radiative transition probability, radiative life time, branching ratio and the stimulated emission cross-sections of prepared BBSS glasses have been calculated. A bright fluorescent orange emission at 600 nm (4G5/2→6H7/2) of Sm3+ion has been investigated as a function of Bi2O3in host glass. The radiative transition probabilities of Sm3+ions are large in bismuth borosilicate glasses, suggesting the suitability of these glasses as potential candidate for laser application.

PHYSICAL, ABSORPTION AND FLUORESCENCE SPECTRAL STUDIES OF Pr3+ IONS DOPED LITHIUM BISMUTH BORATE GLASSES

2013 ◽  
Vol 22 ◽  
pp. 298-304
Author(s):  
BEENA BHATIA ◽  
VISHAL PARIHAR
Keyword(s):  
Transition Probability ◽  
Emission Cross Section ◽  
Radiative Lifetime ◽  
Branching Ratio ◽  
Emission Spectra ◽  
Radiative Transition ◽  
Stimulated Emission ◽  
Radiative Properties ◽  
Spectral Studies ◽  
Intensity Parameters

Glasses of the system: xB2O3-10Bi2O3-30Li2O-xPr6O11 where x =1, 1.5 and 2 were prepared by melt quenching technique. Optical absorption and emission spectra have been recorded. The intensities of f-f transition are calculated in term of Judd-Ofelt (JO) intensity parameters Ωλ (λ = 2, 4 and 6). Using the fluorescence data and these Ωλ parameters, various radiative properties like transition probability (Arad), branching ratio (βR), radiative lifetime (τR), and stimulated emission cross section (σp), of various emission lines have been evaluated. The branching ratio for 3P0→3H4 transition is 56% and the predicted spontaneous radiative transition probability rates are fairly high 16411 s−1. This is beneficial for lasing emission.

scholarly journals Spectral and Transmittance Properties of Er3+ Doped Zinc Lithium Lead Calcium Borophosphate Glasses

2021 ◽  
Vol 9 (12) ◽  
pp. 636-643
Author(s):  
S. L. Meena
Keyword(s):  
Optical Absorption ◽  
Emission Cross Section ◽  
Branching Ratio ◽  
Life Time ◽  
Stimulated Emission ◽  
Radiative Properties ◽  
Absorption Bands ◽  
Borophosphate Glasses ◽  
Intensity Parameters ◽  
Quenching Method

Abstract: Zinc lithium lead calcium borophosphate glasses containing Er3+ in (40- x):P2O5:10ZnO:10Li2O:10PbO:10CaO:20B2O3:xEr2O3 (where x=1, 1.5,2 mol %) have been prepared by melt-quenching method. The amorphous nature of the glasses was confirmed by x-ray diffraction studies. Optical absorption, Excitation, fluorescence and Transmittance spectra were recorded at room temperature for all glass samples. Judd-Ofelt intensity parameters Ωλ (λ=2, 4, 6) are evaluated from the intensities of various absorption bands of optical absorption spectra. 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. Keywords: ZLLCBP Glasses, Optical Properties, Judd-OfeltTheory, Transmittance Properties.

Luminescence studies of Eu3+ ions in tellurite glass ceramics

2019 ◽  
Vol 33 (17) ◽  
pp. 1950179
Author(s):  
Tran Thi Hong ◽  
Phan Tien Dung ◽  
Vu Xuan Quang
Keyword(s):  
Thermal Annealing ◽  
Tellurite Glass ◽  
Transition Probabilities ◽  
Emission Cross Section ◽  
Glass Ceramics ◽  
Branching Ratio ◽  
Stimulated Emission ◽  
Radiative Properties ◽  
Thermal Annealing Process ◽  
Quenching Method

The optical properties of Eu[Formula: see text] ions in tellurite glass ceramics with the chemical composition 50TeO2–29B2O3–10ZnO–10Na2O–1Eu2O3-based precursor glasses were presented. These precursor glasses have been prepared by melt quenching method in air, followed by thermal annealing at 550[Formula: see text]C for 12 h, 24 h and 36 h. After thermal annealing process, the micro–crystals appeared in host tellurite glasses. Judd–Ofelt (JO) parameters were calculated from the photoluminescence (PL) spectral measurements. The [Formula: see text], [Formula: see text] and [Formula: see text] parameters have been used to estimate the radiative properties of Eu[Formula: see text] ions in tellurite glass ceramics such as transition probabilities, branching ratio, radiative lifetimes and stimulated emission cross-section. The results of tellurite glass ceramic have been discussed and compared with the similar studies.

scholarly journals OPTICAL ABSORPTION AND STRUCTURAL STUDIES OF Pr3+ DOPED CADMIUM BISMUTH BORATE GLASSES IN VISIBLE AND NEAR INFRARED REGIONS

2013 ◽  
Vol 22 ◽  
pp. 408-415
Author(s):  
INDER PAL ◽  
ASHISH AGARWAL ◽  
SUJATA SANGHI ◽  
SANJAY ◽  
SUNIL BHARDWAJ
Keyword(s):  
Optical Absorption ◽  
Transition Probability ◽  
Emission Cross Section ◽  
Radiative Lifetime ◽  
Branching Ratio ◽  
Glass Network ◽  
Stimulated Emission ◽  
Radiative Properties ◽  
Luminescence Spectra ◽  
Ligand Field

Glasses having composition 20CdOxBi2O3(79.5-x)B2O30.5Pr6O11 with x varying from 15 to 35 mol% have been synthesized. Optical absorption and fluorescence spectra were measured at ambient temperature. A close correlation is observed between the Bi2O3 content and the spectroscopic properties such as Judd-Ofelt intensity parameters Ωλ = (λ = 2, 4, 6) , radiative and structural properties of prepared glasses doped with Pr3+ ion. The variation of Ω2 with Bi2O3 content has been attributed to changes in the asymmetry of the ligand field at the rare earth (RE) ion site (due to structural change) and to changes in RE-O covalency, whereas the variation of Ω6 has been related to the variation in RE-O covalency. Following the luminescence spectra, various radiative properties like transition probability (Arad), radiative lifetime (τr), branching ratio (βr) and stimulated emission cross section (σ) have been calculated. The branching ratio for 3P0 → 3F2 transition of Pr3+ glass system arrive at 41 to 40%, respectively, and the predicted spontaneous radiative transition probability rates are high and varies from 14032 to 14864 s−1. In addition, the glass stability is improved in which the substitution of B2O3 for Bi2O3 strengthens the glass network structure. The bismuth based glass as a host for Pr3+ ion doped suggesting their suitability for laser applications.

Optical and radiative properties of Nd3+-doped lead tellurite borate glasses

2013 ◽  
Vol 91 (4) ◽  
pp. 322-327 ◽  
Author(s):  
N.B. Shigihalli ◽  
R. Rajaramakrishna ◽  
R.V. Anavekar
Keyword(s):  
Transition Probabilities ◽  
Branching Ratio ◽  
Excited State Absorption ◽  
Radiative Transition ◽  
Radiative Properties ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Laser Applications ◽  
Visible Absorption ◽  
Uv Visible

Glass samples of composition (in mol%) 20PbO-20TeO2-(60 – x)B2O3-xNd2O3 (x = 0, 1, 2, 3, 4) were prepared by melt quenching. The glassy nature of as-quenched samples was established via differential scanning calorimetry. The amorphous nature of the glasses was confirmed via powder X-ray diffraction measurements. Judd–Ofelt (JO) analysis based on UV–visible absorption spectra was performed to determine JO parameters Ωλ (λ = 2, 4, 6). The observed trend is Ω2 > Ω6 > Ω4. The large value of Ω2 indicates the presence of covalent bonding between the Nd3+ ions and the surrounding ligands. Radiative properties, such as radiative transition probabilities, branching ratios, and radiative lifetimes are estimated. The glass samples have relatively high branching ratio, and their emission (Aem) to excited state absorption (AESA) intensity ratio is higher than one for the 4F3/2 → 4I11/2 transition, indicating that the prepared glasses may have potential laser applications.

scholarly journals Luminescence Properties and Judd–Ofelt Analysis of Various ErF3 Concentration-Doped BaF2 Crystals

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4221
Author(s):  
Andrei Racu ◽  
Marius Stef ◽  
Gabriel Buse ◽  
Irina Nicoara ◽  
Daniel Vizman
Keyword(s):  
Transition Probability ◽  
Radiative Lifetime ◽  
Branching Ratio ◽  
Radiative Transition ◽  
Ion Concentration ◽  
Uv Emission ◽  
Intensity Parameters ◽  
Decay Times ◽  
Emission Behavior ◽  
Millisecond Range

The influence of erbium ion concentration on the optical properties of BaF2:ErF3 crystals was investigated. Four ErF3 concentration (0.05, 0.08, 0.15 and 0.5 mol% ErF3)-doped BaF2 crystals were obtained using the Bridgman technique. Room temperature optical absorption in the 250–850 nm spectral range was measured, and the photoluminescence (PL) and decay times were also investigated. The Judd–Ofelt (JO) approximation was used, taking into account four absorption peaks (at 377, 519, 653 and 802 nm). The JO intensity parameters, Ωt (t = 2, 4, 6), were calculated. The influence of the ErF3 concentration on the JO parameters, branching ratio, radiative transition probability and radiative lifetime were studied. The obtained results were compared with measured values and with those reported in the literature. Under excitation at 380 nm, the well-known green (539 nm) and red (668 nm) emissions were obtained. The calculated and experimental radiative lifetimes were in millisecond range for green and red emissions. The intensity of the PL spectra varied with the Er3+ ion concentration. The emission intensity increased linearly or exponentially, depending on the ErF3 concentration. Under excitation at 290 nm, separate to the green and red emissions, a new UV emission band (at 321 nm) was obtained. Other research has not reported the UV emission or the influence of ErF3 concentration on emission behavior.

scholarly journals Optical properties of Eu3+ ions in boro-tellurite glass

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.

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

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.

scholarly journals Recent Developments in Atomic Transition Probabilities

1983 ◽  
Vol 6 ◽  
pp. 795-799 ◽  
Author(s):  
W. L. Wiese
Keyword(s):  
Transition Probabilities ◽  
Transition Probability ◽  
Fusion Energy ◽  
Branching Ratio ◽  
Atomic Transition ◽  
Theoretical Approaches ◽  
Recent Developments ◽  
Laser Development ◽  
Experimental Side ◽  
Semi Empirical

In the last decade, research to determine atomic transition probabilities has proceded at a steady pace. Currently, the main needs for transition-probability data arise from astrophysics, magnetic fusion-energy research, and laser development. The principal approaches for the determination of data have undergone further refinement and the major conventional techniques generally contribute data in roughly the same proportions as earlier. However, some significant changes have also occurred: theoretical approaches, especially semi-empirical approximations, have produced vastly increased amounts of data; on the experimental side, determinations of atomic lifetimes by beam-foil spectroscopy have shown a decline, but work utilizing the branching-ratio emission technique as well as lifetime techniques involving laser excitation are on the increase.

Fluorescence and Judd-Ofelt Analysis of Er3+ Doped CaF2 Transparent Ceramic

2014 ◽  
Vol 875-877 ◽  
pp. 23-27
Author(s):  
Ru Zhen Xing ◽  
Bing Chu Mei ◽  
Jing Hong Song ◽  
Xiao Nv Li
Keyword(s):  
Excited States ◽  
Cross Sections ◽  
Fluorescence Spectra ◽  
Room Temperature ◽  
Transition Probabilities ◽  
Radiative Transition ◽  
Transparent Ceramic ◽  
Ofelt Theory ◽  
Radiation Trapping ◽  
Intensity Parameters

In this paper, we evaluated the spectra parameters of Er3+.The absorption spectra of Er3+:CaF2transparent ceramic was measured at room temperature (RT). Based on the Judd–Ofelt theory, the intensity parameters were Ω2= 5.02×10−20cm2, Ω4= 3.40×10−20cm2and Ω6= 0.38×10−20cm2, and then the values of the radiative transition probabilities, radiative lifetimes and integrated emission cross-sections of excited states were calculated. Full width at half maximum (FWHM) of the fluorescence spectra for4I13/2→4I15/2transition was investigated, being 17nm. The decay time was found to be 24.3ms, which is longer than the theoretically calculated value indicating a radiation trapping effect in this work.

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