Up-conversion and ligand-metal coupling in Cs2NaEr(NO2)6

Barbara Nissen-Sobocinska; Edward Lukowiak; Wieslaw Strek; Thomas Luxbacher; Harald P. Fritzer; Rui-Qiang Xie; Colin D. Flint

doi:10.1117/12.293438

1 November 1997 Up-conversion and ligand-metal coupling in Cs₂NaEr(NO₂)₆

Barbara Nissen-Sobocinska, Edward Lukowiak, Wieslaw Strek, Thomas Luxbacher, Harald P. Fritzer, Rui-Qiang Xie, Colin D. Flint

Author Affiliations +

Proceedings Volume 3176, Tunable Solid State Lasers; (1997) https://doi.org/10.1117/12.293438
Event: Tunable Solid State Lasers, 1996, Wroclaw, Poland

Abstract

The cubic system Cs₂NaEr(NO₂)₆ provides an interesting comparison with the corresponding hexachloroelpasolite, having a similar structure but, in addition, there are high frequency phonons present since the one phonon spectrum extends up to 1 600 cm^-1. The absorption spectrum at low temperatures shows a beautiful progression in the NO₂ bending mode in the near UV in addition to the typical f-f erbium centered transitions. Under red excitation at 80 K into the ⁴I_15/2 yields ⁴F_9/2 transition strong, but short lived emission is observed from both the ⁴F_9/2 and ⁴I_9/2 states. At high irradiation densities intense emission is also observed in the blue at 21 460 and 21 280 cm^-1 and at other wavenumbers in the UV and green regions. These emissions have different complex decay curves and appear to arise from energy migration to defect sites followed by up- conversion at those sites. In the up-conversion process, the luminescent defect sites are destroyed but appear to regenerate on long term storage of the crystals at room temperature.

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Barbara Nissen-Sobocinska, Edward Lukowiak, Wieslaw Strek, Thomas Luxbacher, Harald P. Fritzer, Rui-Qiang Xie, and Colin D. Flint "Up-conversion and ligand-metal coupling in Cs₂NaEr(NO₂)₆", Proc. SPIE 3176, Tunable Solid State Lasers, (1 November 1997); https://doi.org/10.1117/12.293438

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