Abstract
The optical absorption and emission intensity of luminescent and birefringent crystal ErBa3B9O18were examined from optical absorption data based on Judd-Ofelt theory. The three intensity parametersΩt(t=2,4,6) are 3.10 × 10−20, 0.87 × 10−20, and 1.80 × 10−20 cm2, respectively. From the obtained intensity parameters, the radiative probabilitiesAr, radiative lifetimeτf, fluorescence branching ratiosβc, and integrated emission cross sections∑have been calculated. In comparison with other Er-doped luminescent crystals, ErBa3B9O18may find application in thin disk laser.
Highlights
Er3+ activator has attracted much attention for its two laser emissions at 2.94 μm (4I11/2 → 4I13/2) and 1.54 μm (4I13/2 → 4I15/2)
Host material determines the luminescent efficiency of the laser crystal or phosphor in many cases
The absorption spectrum was measured from ultraviolet to infrared wavelength by the use of Lambda-900 UV–VIS–NIR spectrophotometer at room temperature
Summary
Er3+ activator has attracted much attention for its two laser emissions at 2.94 μm (4I11/2 → 4I13/2) and 1.54 μm (4I13/2 → 4I15/2). The emission efficiency can be limited by the relatively low concentration of luminescent centers, because the quenching effect will occur if the Er3+ ions concentration is too high. Host material determines the luminescent efficiency of the laser crystal or phosphor in many cases. A series of isostructural compounds RBa3B9O18 (R = Y, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb) [17, 18] were found to exhibit good luminescence properties under UV or X-ray excitations These rare earth alkaline-earth isostructural compounds were first identified and structurally characterized by Li et al [19]. They crystallize in centric space group P63/m with lattice parameters of about a = 7.17 Aand c = 16.97 A. We performed the research on spectroscopic properties of EBBO
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