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The nature of sharp emission lines which are present in macro--luminescence experiments on a type-II GaAs/AlAs double quantum well structure is discussed. The experiments, which also include micro-luminescence measurements, allowed us to conclude that the sharp emission lines observed originate from lateral GaAlAs islands of a few µm in diameter. They serve as efficient type-I recombination centers for indirect excitons and/or carriers which diffuse in the GaAs/AlAs QW structure and stronglydoi:10.12693/aphyspola.106.367 fatcat:orz2eaushrdt7hdlbwg6mw43gq