Absorption spectra in the visible region from (a) samples , , , and at room temperature, and (b) sample (solid line) and sample (dotted line) at . The vertical scales are logarithmic.
Infrared absorption at from (a) sample , (b) sample , (c) sample , and (d) sample . Note the different linear vertical scales and the small vertical range for (c). The longer wavelength regions for (a), (b), and (d) are enhanced by the factors shown. There is an additional band near marked with an asterisk in (a).
Infrared absorption due to at room temperature from samples .
PL spectra at from (a) sample and (b) sample under excitation using a power density of . The spectra are vertically offset for clarity, and the spectrum from sample has been enhanced by a factor of 3.
emission from sample under excitation at 10, 100, and . The excitation power density was . Two of the curves have been enhanced by the factors shown.
Integrated intensity of the emission vs temperature from (a) sample (solid squares) and (b) sample (open circles) under excitation. The maximum intensity for each curve is normalized.
Lifetime of the emission vs temperature: sample (solid squares), sample (solid diamonds), sample (open diamonds), and sample (solid circles). Excitation was provided by a chopped Ti:Sapphire laser.
EPR spectrum from sample at with the magnetic field along a  direction.
EPR spectra taken from Co:ZnSe sample : (a) taken at , and (b) taken at . Illumination with light produced changes in these EPR signal intensities. The EPR signal due to increased, and the EPR signal due to decreased.
Annealing conditions, sample thicknesses, and concentrations for diffusion-doped Co:ZnSe samples. The dopant concentrations were obtained using room temperature absorption data at and an absorption cross section3 , and using the EPR spectra at near for each of the samples.
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