Luminescence and Scintillation Properties of Dy3+ doped Li6Y(BO3)3 crystal

Optical Spectroscopy of Li6Y(BO3)3 Single Crystals Doped with Dysprosium

“…Three weaker groups of bands observed approximately at 15,040, 13,160, and 11,770 cm −1 in the near-infrared region are assigned to the 4 F 9/2 → 6 H 11/2 , 4 F 9/2 → 6 H 9/2 , 6 F 11/2 and 4 F 9/2 → 6 H 7/2 , 6 F 9/2 transitions, respectively (Figure 5a,b). The positions of the main emission bands are in good agreement with those reported earlier for Li 6 Y(BO 3 ) 3 :Dy [10,12,24] and various other systems, such as phosphate glasses, molybdates and vanadates [32][33][34]. The shape of the bands responsible for the 4 F9/2 → 6 H15/2 and 4 F9/2 → 6 H13/2 transitions varies in the above-cited works, and for that reason, zoomed spectrum parts measured with higher spectral resolution are shown for these transitions in more detail in Figure 6; Figure 7.…”

“…The general features of the recorded excitation spectrum are with the excitation spectra reported earlier for glass [12] and crystalline ever, by using a better spectral resolution it was possible to ascribe the specific levels of the higher-energy multiplets situated above 22,000 cm The position of higher energy multiplets of the Dy 3+ ion in Li6Y(BO3)3 may be obtained from the excitation spectra of the LYB:Dy(1 mol%) single crystal measured for the 17,331 cm −1 emission line, one of the most intense ones in the series of the 4 F9/2 → 6 H13/2 transitions (Figure 8). The general features of the recorded excitation spectrum are in good agreement with the excitation spectra reported earlier for glass [12] and crystalline material [24], however, by using a better spectral resolution it was possible to ascribe the observed bands to specific levels of the higher-energy multiplets situated above 22,000 cm −1 . According to [10,35,36] the 4 F9/2 → 6 H15/2 transition is an allowed magnetic dipole transition and the 4 F9/2 → 6 H13/2 transition belongs to a forced electric dipole transition being allowed only in the case when the Dy 3+ ion is located at a lattice site missing inversion center symmetry.…”

“…The position of higher energy multiplets of the Dy 3+ ion in Li 6 Y(BO 3 ) 3 may be obtained from the excitation spectra of the LYB:Dy(1 mol%) single crystal measured for the 17,331 cm −1 emission line, one of the most intense ones in the series of the 4 F 9/2 → 6 H 13/2 transitions (Figure 8). The general features of the recorded excitation spectrum are in good agreement with the excitation spectra reported earlier for glass [12] and crystalline material [24], however, by using a better spectral resolution it was possible to ascribe the observed bands to specific levels of the higher-energy multiplets situated above 22,000 cm −1 .…”

“…As a consequence, the Stark components of various nearby levels are mixed and cannot be unambiguously assigned, especially at high energies above 29,000 cm −1 (see, e.g., Figure 3g,h). Some doubtful assignments based on the excitation spectrum of a LYB:Dy crystal can be found in the paper by Saha et al [24]. Difficulties in the determination of the proper energy terms have also been encountered for other monoclinic crystals, such as KY(WO 4 ) 2 and Lu 2 SiO 5 , doped with Dy 3+ ions [29,30].…”

“…This sensitive energy transfer to the Dy 3+ ions through the excited Yb 3+ states and a stable borate host matrix establish the potential of using dysprosium doped LYB crystals in quantum optical experiments. Preliminary spectroscopic studies of Dy-doped Li 6 Y(BO 3 ) 3 have been performed for polycrystalline phosphors [10], glasses [12], and recently, single crystals [24]. These studies revealed the spectral positions and temporal characteristics of the main electronic transitions of Dy 3+ in the material, however, did not provide information on fine structure of the transitions necessary to fully identify the crystal field splitting of Dy 3+ ion states introduced in such an anisotropic matrix.…”