Up-conversion and energy migration in the holmium hexachloroelpasolites

Werner Humbs; Johann Strasser; Dieter Braun; Ralph Sabry-Grant; Svetlana Drndarski; Colin D. Flint; Hartmut Yersin

doi:10.1117/12.293435

1 November 1997 Up-conversion and energy migration in the holmium hexachloroelpasolites

Werner Humbs, Johann Strasser, Dieter Braun, Ralph Sabry-Grant, Svetlana Drndarski, Colin D. Flint, Hartmut Yersin

Proceedings Volume 3176, Tunable Solid State Lasers; (1997) https://doi.org/10.1117/12.293435
Event: Tunable Solid State Lasers, 1996, Wroclaw, Poland

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 Cs₂NaY_0.99Ho_0.01Cl₆ 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 Cs₂NaNd_0.01Ho_0.99Cl₆ 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 Cs₂NaY_1-xHo_xCl₆. 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.

Citation Download Citation

Werner Humbs, Johann Strasser, Dieter Braun, Ralph Sabry-Grant, Svetlana Drndarski, Colin D. Flint, and Hartmut Yersin "Up-conversion and energy migration in the holmium hexachloroelpasolites", Proc. SPIE 3176, Tunable Solid State Lasers, (1 November 1997); https://doi.org/10.1117/12.293435

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