Abstract
The energy levels of Dy3+ ions have been determined in lithium yttrium borate (Li6Y(BO3)3) single crystals in a wide spectral range between 3000 and 40,000 cm−1 using optical absorption and luminescence spectroscopy, which also allow for an analysis of the ground state. The crystal field splittings of the 6H15/2 ground state and all excited states up to the 4F7/2 manifold were obtained at a low temperature, based on luminescence (T = 4.2–78 K) and absorption (T = 8–100 K) measurements, respectively. The numbers of experimentally observed Stark sublevels are in agreement with those expected theoretically for Dy3+ ions occupying a single low symmetry (C1) site.
Highlights
Borate crystals often demonstrate advantageous properties such as high optical quality, transparency in a wide spectral range including vacuum ultraviolet (VUV), and optical nonlinearity
The energy levels of Dy3+ ions have been determined in lithium yttrium borate (Li6Y(BO3)3) single crystals in a wide spectral range between 3000 and 40,000 cm−1 using optical absorption and luminescence spectroscopy, which allow for an analysis of the ground state
Lithium yttrium borate (Li6Y(BO3)3, LYB) has been suggested as a phosphor, laser, or scintillator material depending on the host morphology and rare-earth (RE) ion doping [10,11,12,13]
Summary
Borate crystals often demonstrate advantageous properties such as high optical quality, transparency in a wide spectral range including vacuum ultraviolet (VUV), and optical nonlinearity. The absorption bands correspond to the transitions from the lowest sublevel of the 6H15/2 ground state to the excited energy levels of the Dy3+ ions, which can be assigned using the Dieke. Since no additional absorption lines appear in the low-temperature spectra, only one type of site can be assumed for Dy3+ ions in the LYB lattice, as expected due to the isostructural property of Li6RE(BO3) crystals [16]. As the higher sublevels of the ground state become populated at elevated temperatures, additional repetitions for these transitions appear at wavenumbers less by the same amounts (42, 79, and 134 cm−1) corresponding to transitions from some of the higher Stark levels of the ground state to unchanged excited states The positions of these hot replicas are helpful for identifying the lowest energy Stark levels of the ground state to be situated at 42, 79, and 134 cm−1. State arecrfoyusntdala.tT42h,e79haontdb1a34ncdms−1s.how that the lowest energy crystal field components of the ground state are found at 42, 79 and 134 cm−1
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