Visible range optical absorption of Er ³⁺ ions in yttrium aluminum borate (YAB) crystals

Abstract

F 5/2 , and 4 F 3/2 manifolds were analyzed in detail. The low temperature absorption spectra of Er:YAB consist of sharp lines, the number of which corresponds to the theoretical predictions. This suggests that Er 3+ ions uniformly occupy one specific lattice site (yttrium positions) with negligible aggregation at the higher dopant concentrations.

Luminescence of YAB:Er single crystal

“…The broad 4 T 2 → 4 A 2 (from 600 to 900 nm) and the sharp 2 E → 4 A 2 (681 and 684 nm) emissions were consistent with the data published in [11] Figure 1 shows the fine structure of the 4 S 3/2 → 4 I 15/2 emission of a YAB:Er(1%) sample at different temperatures. The Stark components identified in the luminescence spectra were in accordance with those derived from the high resolution absorption spectra for both A and B sublevels of the 4 S 3/2 manifold [3], and with the crystal field predictions [9]. Larger deviations occured when the related absorption positions could only be measured at room temperature with lower accuracy (e.g.…”

“…This was attributed to Er-Er interactions in the crystal. Er-Er interaction was also detected in the high resolution absorption spectra as small satellites around the main transitions at high Er concentrations [3]. The decay time of the luminescence was almost independent of the temperature up to about 100 K, and then sharply decreased for both Erconcentrations (Fig.…”

“…[3,4]. Er 3+ related luminescence spectra were only presented in double doped YAB where the excitation is efficient [5,6].…”

“…On the other hand, the A1 and B2 emissions were suppressed at higher Er concentrations. The lowest energy luminescence band (18002 cm -1 ) was attributed to phonon combination I 15/2 transition in the luminescence spectrum of YAB:Er 3+ single crystal at 10 K and 70 K. Measured (m) and derived (d) energy levels from high resolution absorption spectra [3] and theoretical predictions [9] are shown for comparison.…”

Spectroscopic investigation and crystal field modelling of Dy3+and Er3+energy levels in yttrium aluminium borate (YAB) single crystals

“…This suggests that the fitting quality might be improved by significantly increasing the spectral resolution. For the YAB:Er 3+ system the high resolution absorption spectra in the range 6000-23 000 cm −1 have already been published [8,9], while standard resolution spectra have been reported up to 27 500 cm −1 [10]. However, the only calculated energy levels for Er 3+ in YAB available in the literature [11] were obtained by fitting standard resolution spectroscopic data.…”