Abstract
For the first time, the luminescence properties of Pr3+, Nd3+ and Tm3+ and Yb3+ ions in fluorite crystal have been obtained by steady-state measurements. In addition, the luminescence spectra of Ce3+, Sm2+, Sm3+, Dy3+, Er3+ and Yb3+ were measured. It was pointed out that λexc. = 415 nm is most suitable for measuring the Ho3+ emission beside the Er3+. The emission of trivalent holmium and erbium ions was measured independently using time-resolved measurements and tentative assignment of luminescence lines to C 3v and C 4v symmetry sites was proposed. Besides for natural fluorite crystal, the transitions between Stark energy levels of lanthanide ions were presented.
Highlights
Fluorite is one of the best-known fluorescent minerals, and its specific properties led G
The luminescence of natural fluorite crystals was measured by various methods, among which the photoluminescence (PL) was most often used and significant
There has been a large number of research papers on the luminescence of natural fluorite measured by the steady-state method (Illiev et al 1988; Aierken et al 2000, 2003; Bodył 2006; Petit et al 2007; Czaja et al 2008; Bodył 2009) or the time-resolved method (Gaft et al 1998, 2001a, b, 2005, 2008)
Summary
Fluorite is one of the best-known fluorescent minerals, and its specific properties led G. The crystal field can split the energy levels of the RE ion and remove their degeneracy, as the complex character of absorption and emission spectra have often revealed. The emission lines belong to transitions between Stark’s multiplets of excited and ground levels.
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