Energy transfer between Co2+ and Fe2+ ions in diffusion-doped ZnSe

Absorption, photoluminescence (PL), and time-resolved PL measurements were applied to samples of polycrystalline ZnSe which were diffusion doped with iron or with cobalt or codoped with both iron and cobalt. Characteristic emission and absorption features due to Co2+ and Fe2+ were observed in the visible and infrared regions. In the spectral region near 3μm, a Co2+ emission overlaps completely with an Fe2+ absorption and energy transfer occurs. Using PL lifetime data, a decrease in the Co2+ lifetime of ∼300μs to less than 100μs was observed. This decrease in lifetime indicates that the nature of the energy-transfer process is nonradiative. The energy-transfer rate decreases with temperature, as expected for the nonradiative electric dipole-dipole interaction. The temperature dependences of both Co2+ and Fe2+ emissions are described.

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