Fe:ZnSe and other transition metals have broad upper and lower energy manifolds which give rise to broad absorption and fluorescence bands in the mid-IR spectral region. Energy transfer between Fe2+ ions via re-absorption of fluorescence (due to the spectral overlap of these bands) and phonon-assisted energy transfer (due to the lattice dynamics of ZnSe) becomes more probable with increasing Fe2+ concentration. Here we treat these processes as additional terms in the rate equations which govern the spontaneous decay of the Fe2+ ion. This treatment gives insight into anomalous behavior seen in the thermal lifetime of the Fe:ZnSe system. We also apply the model to other transition metal doped II-VI materials.
Jonathan W. Evans, Thomas R. Harris, Eric J. Turner, Martin M. Kimani, J. Matthew Mann, Ronald W. Stites, Gary Cook, and Kenneth L. Schepler, "Re-absorption and nonradiative energy transfer in vibronic laser gain media," Proc. SPIE 10511, Solid State Lasers XXVII: Technology and Devices, 105110I (Presented at SPIE LASE: January 29, 2018; Published: 15 February 2018); https://doi.org/10.1117/12.2290822.
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