Analysis Of Nd3 Research Articles

Investigation of radiation shielding and optical properties of neodymium doped Bismuth Boro tellurite glasses for solid state device applications

In this work, a variety of glass samples with different chemical profiles for optical applications were synthesized, and characterized. The thermal properties of the prepared glass are investigated through Differential Thermal Analysis (DTA) and we have observed the endothermic peak at 894.9 °C and exothermic peak at 1066 °C. The optical properties were investigated using a UV–Visible–NIR Spectrophotometer, and the radiation shielding properties were reported using the Phy-X/PDS software. The optical property results show that when the amount of Nd3+ ions in a glass structure grows, the oscillator strengths also increase. The high emission cross-section and excellent quantum efficiency indicate that glass has the potential for compact 1.06 μm laser applications. The Photoluminescence (PL) analysis of Nd3+ ions doped prepared glass samples are recorded at 808 nm laser diode. The emission spectra for every Nd3+ ion concentration exhibit three distinct emission peaks at wavelengths of 902 nm, 1064 nm, and 1339 nm. The investigation of luminescence kinetics revealed the development of neodymium ion clusters commencing at a neodymium concentration of 1.006 × 1020cm−3. Furthermore, we noticed that the addition of Nd2O3 increased the mass attenuation coefficient and effective atomic number of the glass samples. In terms of the glasses' ability to absorb charged particles, the Nd2O3 addition also made a difference in Half Value Layer, Mean Free Path, and Effective atomic number. The research shows that the glass samples are non-toxic, visible light transparent, and radiation-efficient.

Analysis of Nd3+ concentration on the structure, morphology and photoluminescence of sol-gel Sr3ZnAl2O7 nanophosphor

Abstract Neodymium activated strontium zinc aluminate (Sr3ZnAl2O7:x%Nd3+) nanophosphor was synthesized using the sol-gel technique whereby the Nd3+ concentration was varied in the range 0 ≤ x ≤ 2. The effect of Nd3+ concentration on the structure, particle morphology and photoluminescence properties of Sr3ZnAl2O7 were investigated. The X-ray diffraction (XRD) results revealed that all samples resembled the mixture of both ZnAl2O4 and Sr3Al2O6 cubic structures. Nd3+ doping influenced the crystallite sizes of the prepared phosphor materials. The energy dispersive X-ray spectroscopy (EDS) results confirmed the presence of all expected elements in the composition. Scanning electron microscopy (SEM) revealed that as the Nd3+ concentration increased the surface morphology changed to smooth mountain-like structures. The ultraviolet–visible (UV–Vis) diffuse reflection spectroscopy showed that the band gap of Sr3ZnAl2O7 can be tuned from 2.74 to 2.95 eV by increasing the Nd3+ concentration. When the host is excited above the bandgap (374 nm), broad emission attributed to defects occurs with the maximum near 585 nm. Doped samples excited in this manner do not exhibit additional luminescence due to the Nd3+ ions, but in contrast there is a small dip in the defect emission band near 585 nm due to absorption attributed to Nd3+ ions. Characteristic infrared emissions of Nd3+ ions at 885, 1064 and 1340 nm were observed by directly exciting the Nd3+ ions at 585 nm (4I9/2 → 5G5/2 + 2G7/2) and were attributed to 4F3/2 → 4I9/2, 4I11/2 and 4I13/2 transitions, respectively. The Commission Internationale de l’Eclairage (CIE) coordinates results showed that the orange emission colour is from the host.

Judd-Ofelt analysis of Nd3+ doped phosphate glass: The effect of Ba/Sr ratio

ABSTRACTHere we disclosed the substantial effect of the local medium in the vicinity of the excited Nd3+ions on the optical properties and the laser characteristics of glasses. The UV-Vis absorption of the laser BaO/SrO–P2O5–Al2O3–K2O–B2O3–La2O3 glasses doped with Nd3+ ions is measured at 25 °C. Judd-Ofelt (JO) theoretical analysis of 4f electron transitions in the Nd3+ absorption spectra was performed. From the JO intensity parameters, a set of the laser 4F3/2→4I11/2 transitions characteristics are found and stimulated emission cross-sections are characterized. The effect of different Ba/Sr ratio on the structure-properties relationships in the glasses is shown.

Optical and Physical Analysis of Nd3+ Doped Borosilicate Glasses

Optical and Physical Analysis of Nd3+ Doped Borosilicate Glasses

Spectroscopic analysis of Nd3+(4f3) absorption intensities in a plastic host (HEMA)

Spectroscopic and laser properties of Nd3+ embedded in a 2-hydroxyethyl methacrylate (HEMA) solid plastic host are characterized. The Judd–Ofelt model has been applied to the room temperature absorption intensities of Nd3+(4f3) transitions in HEMA to determine the three phenomenological intensity parameters: Ω2, Ω4 and Ω6. The intensity parameters are then utilized to determine the radiative decay rates (emission probabilities of transitions) and branching ratios of the Nd3+(4f3) transitions from the upper manifold state 4F3/2 to the lower-lying multiplet manifolds 4IJ′. The predicted decay rates and branching ratios of the Nd3+(4f3) inter-manifold transitions in HEMA are compared with those in other laser host media. From the radiative decay rates, the radiative lifetime of the Nd3+4F3/2 excited state is determined. Copyright © 2004 Society of Chemical Industry

Correlation-crystal-field analysis of Nd3+(4f3) energy-level structures in various crystal hosts

We have performed an in-depth correlation-crystal-field (CCF) analysis of the energy-level structures in 10 Nd3+(4f3) crystal systems: NdF3, Nd2Te4O11, NdVO4, NdPO4, Nd3+:LiYF4, Nd3+:LaVO4, Nd3+:LaCl3, Nd3+:BaY2F8, Nd3+:YAlO3 and Nd3+:LuA1O3. A model Hamiltonian employing 20 free-ion parameters, appropriate one-electron crystal-field interaction parameters and also selected two-particle CCF interaction parameters was diagonalized within the complete 364 SLJMJ basis set of the 4f3 electronic configuration. Inclusion of the fourth-rank g2(4), g10A(4) and g10B(4) CCF operators in the phenomenological energy-level fits yields an overall improved agreement between calculated and empirical energy levels besides eliminating major discrepancies between calculated and observed crystal-field splittings within the anomalous 2H(2)11/2 multiplet of Nd3+ ion. The fits are also in qualitative agreement with the ab initio calculations of CCF effects for lanthanide ions.

Spectroscopic analysis of Tm3+:NaLa(MoO4)2

Absorption spectra of trivalent thulium (Tm3+, 4f12) doped double molybdate NaLa(MoO4)2 (NLM) are reported between 370 and 2000 nm at approximately 16 K. Laser-excited fluorescence spectra obtained at 4.2 K from multiplet manifolds 1G4 and 3H4 to manifolds 3F4 and the ground state 3H6 are also reported. The observed spectra are broad in this disordered host as compared with the spectra observed for Tm3+:YAG (yttrium aluminum garnet). The observed crystal field splitting of the multiplet manifolds in Tm3+:NLM is in reasonable agreement with the calculated splitting based on smoothed crystal field parameters obtained from an analysis of Nd3+:NLM and Er3+:NLM. The smaller crystal field splitting in Tm3+:NLM as compared with Tm3+:YAG may discourage cross-relaxation from the 3H4 to the 3F4 manifold in this host. This in turn may favor laser operation on the 3H4→3F4 transitions over the 3F4→3H6 transitions.

Group analysis of Nd3+ energy spectrum in crystal field

A theoretical analysis is made of the influence of the crystal field with cubic, hexagonal, tetragonal and trigonal symmetries on the lifting of the degeneracy of the free Nd3+ ion energy levels and at the same time the selection rules are determined for the dipole and quadrupole transitions between the split levels for the above symmetries.