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A detailed analysis of decay kinetics of light induced electron spin resonance signals of Cr1+ and Fe3+ ions in ZnSe:Fe,Cr is given. We observe that the Cr1+ electron spin resonance signal decays once free electrons are thermally ionized from shallow donors of ZnSe. Such unusual behavior of the Cr1+ electron spin resonance signal is explained by efficient two-center Auger recombination: the Cr1+ center is ionized due to the Auger-type energy transfer from the electron being trapped by the Fe3+ ion. Such process is shown to be consistent with the temperature dependence of the decay times of electron spin resonance signals. Its quantum efficiency is estimated to be as large as 18% for Cr and Fe concentrations which were studied.

Efficient Two-Center Auger Mechanism of Electron Trapping by Fe3+Ions in ZnSe:Fe,Cr

Efficient Two-Center Auger Mechanism of Electron Trapping by Fe³⁺Ions in ZnSe:Fe,Cr