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Proceedings Paper

Up-conversion and energy migration in the holmium hexachloroelpasolites
Author(s): Werner Humbs; Johann Strasser; Dieter Braun; Ralph Sabry-Grant; Svetlana Drndarski; Colin D. Flint; Hartmut Yersin
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Paper Abstract

Excitation into the 5I8yields5F5 transition of Cs2NaHoCl6 near 15 633 cm-1 at 300 K results in strong, long lived emission from the 5F5 state wit an almost exponential decay curve. The decay constant of this emission decreases slightly in Cs2NaY0.99Ho0.01Cl6 the decay becoming exactly exponential, the difference between the decay constants is greater at lower temperatures. This suggests that there is migration in the host lattice followed by energy transfer to defect sites with short 5F5 lifetimes in the pure Ho compound and this hypothesis is confirmed by measurements of the relaxation of the 5F5 state in Cs2NaNd0.01Ho0.99Cl6 where the decay constant is greatly increased but the decay curves are exponential. Under the same conditions and at temperatures from 1.2K to 300K there is emission in the ultraviolet, green and blue regions from Cs2NaY1-xHoxCl6. The decay curves are complex with more than one rise and decay processes reflecting a variety of up-conversion processes. The mechanisms of these processes are discussed.

Paper Details

Date Published: 1 November 1997
PDF: 5 pages
Proc. SPIE 3176, Tunable Solid State Lasers, (1 November 1997); doi: 10.1117/12.293435
Show Author Affiliations
Werner Humbs, Univ. Regensburg (Germany)
Johann Strasser, Univ. Regensburg (Germany)
Dieter Braun, Univ. Regensburg (Germany)
Ralph Sabry-Grant, Univ. of London (United Kingdom)
Svetlana Drndarski, Univ. of London (United Kingdom)
Colin D. Flint, Univ. of London (United Kingdom)
Hartmut Yersin, Univ. Regensburg (Germany)


Published in SPIE Proceedings Vol. 3176:
Tunable Solid State Lasers
Wieslaw Strek; Edward Lukowiak; Barbara Nissen-Sobocinska, Editor(s)

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