Polarized electroluminescence spectra of GaxIn1−xP/(Al0.6Ga0.4)0.5In0.5P quantum wells

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Abstract
Electroluminescence spectra of 80 Å GaxIn1−xP/(Al0.6Ga0.4)0.5In0.5P quantum wells (QWs), with x=0.3, 0.4, 0.5, and 0.6, are examined. The polarization is anisotropic, and the light‐hole (lh) and heavy‐hole (hh) transitions are resolved at current densities between 1 A/cm2 and threshold. In the compressively strained (x=0.3, 0.4) QWs, the hh is ground state and transverse electric‐mode emission dominates. The lh and hh band edges are reversed for the tensile‐strained QW, however, and the emission is predominantly transverse magnetic. Near threshold, the bandfilling effect is most pronounced in the compressively strained QWs, suggesting a reduced in‐plane hh effective mass. For the most highly compressed QW (x=0.3, λ=707 nm), the threshold current density is 190 A/cm2.