OPTICAL-PROPERTIES OF AIP-GAP SHORT-PERIOD SUPERLATTICES

We present several optical properties of (AlP)n(GaP)n short-period sup erlattices grown by metalorganic vapor phase epitaxy (MOVPE), which in clude the low temperature photoluminescence of samples with shorter pe riods, low temperature photoluminescence lifetime, and refractive inde xes of the superlattices at room temperature. The photoluminescence ch aracteristic of the superlattice with n = 3 has been clearly observed. The radiative lifetimes of the excited carriers in superlattices are longer than that in a nitrogen-doped bulk GaP. It has been found that the refractive indexes of (AlP)n(GaP)m superlattices are similar to th at of an Al0.5Ga0.5P alloy.