Energy Transfer Between Excitons and the 3d• Electrons of mn2+ in zn1-xmnxse
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Date
1995-06
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Addis Ababa University
Abstract
In this thesis the excitation spectra of the 4T I ~ 6 Al emission of Mn2+ in Znl.,Mn.Se
crystals and their dependence on the crystal temperature, intensity of the exciting laser and
manganese concentration (x «; 0.016) are investigated. Eventhougth some of the excitation
spectra of these crystals were published in literature the origin of one of the excitation band
( M-band ) still remains Iillknown. The M-band is an excitation band of the 'TI ~ 6AI
emission of Mn2+ in Znt.,Mn.Se within the spectral range of bound excitons. Computer
fitting teclmiques were used to detennine some important parameters of the M-band and the
bound exciton band (BE-band).
1)
From the comparison of the crystal temperature, exciting laser intensity and Mn
concentration dependence of some of these fitting parameters of the M-band with that of the
BE-band it is found that the M-band is built up of a multiple of bound excitons, which are
different from that of the BE-band
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Keywords
Energy transfer between Excitons