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Infrared PL spectra taken at from GaN epilayers having Er concentrations in the range of . PL from an undoped control sample is also shown.
(a) PL spectra at indicted temperatures taken from the epilayer having an Er concentration of ; (b) Thermal quenching of the integrated PL intensity for samples with of and .
SQUID measurements as a function of temperature from GaN epilayer with an Er concentration of , in an applied field of . Field-cooled and zero-field-cooled magnetization data points are shown.
Plots of the measured integrated PL intensity at (top panel) and the saturation magnetization (bottom panel) vs Er concentration.
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