Effect of Nd3 + concentration on the physical and absorption properties of sodium-lead-borate glasses

Abstract

The effect of increasing the rare earth ion concentration on the physical and spectroscopic properties of Nd 3+ doped sodium-lead-borate glasses have been studied for the compositions (10-x) Na 2 O-30PbO-60B 2 O 3 -xNd 2 O 3 , where x = 1.00, 1.25, 1.50, 1.75 and 2.00 mol %. Optical band gaps, cut-off wavelengths and various spectroscopic parameters (E 1 , E 2 , E 3 , F 2 , F 4 , F 6 and ξ 4 f ) have been determined from the room temperature absorption spectra. Judd-Ofelt theory has been employed to determine the intensity parameters Ω 2 , Ω 4 and Ω 6 which in turn are used to evaluate radiative transition probability (A), branching ratio (β) and radiative lifetime (τ R ) for the fluorescent level 4 F 3/2 . The Ω 2 parameter and hence the non-symmetric component of electric field acting on Nd 3+ ion is found to be highest for glass with 1.75 mol% of Nd 2 O 3 . Because of the poor resolution of hypersensitive transition, the covalency of the Nd-O bond has been characterized by the relative intensity of 4 I 9/2 → 4 F 7/2 , 4 S 3/2 . The highest covalency has been predicted for glass with 2 mol% Nd 2 O 3 . The radiative properties are found to improve with an increase in concentration of Nd 2 O 3 for the present study.

Optical absorption and structural studies of bismuth borate glasses containing Er3+ ions

“…The Er-ion concentration (N) is of great interest since it affects different properties of the host material. The number of ions per cubic centimeter was calculated according to the formula [24,25] N ion=cm where N A is Avogadro's number, and x is the mol fraction of rare earth oxide. The calculated values are listed in Table 1, and shown in Fig.…”

Spectroscopic analysis on the basis Judd–Ofelt theory of Nd 3+ in (Y 0.985 Nd 0.015 ) 2 O 3 : A transparent laser-host ceramic

“…They observed the figure of merit to be maximized for 1.5 mol% Nd 3+ doped Y 2 O 3 ceramics. It is, therefore, worthwhile to investigate the spectroscopic parameters for 1.5 mol% Nd 3+ doped Y 2 O 3 ceramic as these parameters are found to be strongly dependent on dopant ion concentration [20]. This analysis will further elaborate the efficacy of this composition as laser host.…”

Optical properties of Er3+ doped phosphate glasses

“…Where S ed and S md the electric and magnetic dipole strengths, ed =n(n 2 +2) 2 /9and  md = n 3 are the Dexter correction for the local field in a medium of refractive index n Where Ω t (t=2, 4, and 6) are Jude-Ofelt intensity parameters, m is the electron mass, 0 is the wavenumber at the maximum absorption (cm -1 ), 2J +1 is the degeneracy of the originating level of the transition, h is the Plank constant = 6.6261 x 10-27 erg.sec, and ⟨ || || ⟩ are the doubly reduced matrix elements of the tensor transition operator and they have been calculated as in [Mohan 2007, P.Hehlen 2013 using [RELIC 2013].…”