Fluorescence quantum efficiency measurements of excitation and nonradiative deexcitation processes of rare earth 4f-states in chalcogenide glasses

Lima, S.M., De Camargo, A.S.S., Nunes, L.A.de Oliveira, Catunda, T. and Hewak, D.W. (2002) Fluorescence quantum efficiency measurements of excitation and nonradiative deexcitation processes of rare earth 4f-states in chalcogenide glasses. Applied Physics Letters, 81 (4), 589-591. (doi:10.1063/1.1495879).

Record type: Article

Abstract

Thermal lens spectroscopic measurements were performed to quantitatively determine the fluorescence quantum efficiency (eta) of different luminescence mechanisms in Nd³⁺ chalcogenide glasses. Low energy (<1.7 eV) direct resonant pumping at Nd³⁺ infrared lines resulted in eta ~1. High energy (~2.4 eV) indirect excitation via energy transfer (ET) from glass conduction band to Nd³⁺ 4f states, resulted in eta = ~0.4 (ET probability ~40%). A minimum eta ~0.2 was obtained for intermediate excitation energies (~2.2 eV) and attributed to back ET from the Nd³⁺ 4f state to the glass host.

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