Visible luminescence from semiconductor quantum dots in large ensembles

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  • R. Leon
    Center for Quantized Electronic Structures (QUEST), University of California, Santa Barbara, California 93106
  • S. Fafard
    Center for Quantized Electronic Structures (QUEST), University of California, Santa Barbara, California 93106
  • D. Leonard
    Center for Quantized Electronic Structures (QUEST), University of California, Santa Barbara, California 93106
  • J. L. Merz
    Center for Quantized Electronic Structures (QUEST), University of California, Santa Barbara, California 93106
  • P. M. Petroff
    Center for Quantized Electronic Structures (QUEST), University of California, Santa Barbara, California 93106

抄録

<jats:p>Visible luminescence has been obtained from ensembles of defect-free, InxAl(1−x)As islands of ultrasmall dimensions embedded in AlyGa(1−y)As cladding layers. These structures were grown by molecular beam epitaxy and studied with low-temperature photoluminescence (PL) and transmission electron microscopy. Visible luminescence is produced using various compositions of InxAl(1−x)As/AlyGa(1−y)As. Quantum dot size distributions, planar densities, dot heights, and wetting layer thicknesses are presented and correlated with the PL spectra.</jats:p>

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