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Photoluminescence intensity as function of V/III and ratios as indicated. The shaded area roughly outlines a region of unstable growth conditions.
Measured (a) and simulated (b) HRXRD spectra of test structure with five 6.9 nm QWs. Inset: PL spectrum from the same sample compared to ones with 2–4 QWs.
Broad-area laser threshold current density (per QW) and as function of the number of QWs.
Threshold current densities for lasers from the present work (open symbols) as compared to other reported values for QW broad-area lasers at long wavelengths (solid symbols).
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