We present crystal-field (CF) calculations of energy levels () of Eu ions doped in various hosts aimed at exploring the low-symmetry properties of CF parameters (CFPs) and reliability of CFP modelling with decreasing site symmetry. The hosts studied are: LiY(BO), LiGd(BO), YBO, and ZnO with Eu at triclinic sites; YAl(BO) with Eu ions at trigonal symmetry. Two independent CFP modelling approaches utilizing the hosts' structural data are employed: the exchange charge model (ECM) and the superposition model (SPM).
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