Abstract
Using a combination of optical absorption and laser selective excitation, an extensive set of energy levels has been established for the principal Ho3+ center in CsCdBr3:Ho3+, a Ho3+-vacancy-Ho3+ arrangement. This Ho3+ pair center exhibits strong upconversion fluorescence under CW laser excitation of the 5I8 → 5S2, 5F4 transitions in the green and the 5I8 → 5F5 transitions in the red. A particular feature of the spectrum is the small pair splittings of the sharper transitions, arising from the inter-Ho3+ ionic coupling. Both the strong upconversion and the small pair splittings parallel features already reported for the principal Er3+ center in CsCdBr3:Er3+, and the similarities and differences are high-lighted. The dynamics of the upconversion fluorescence of these Ho3+ dimer pairs is also presented.
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