Broadband optical devices using QDs array waveguides

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We have studied broadband optical devices using array waveguide structure of QDs core by selective MOVPE growth. To obtain the broadband operational wavelength range, bandgap energy of each array waveguide and each layer of multi-stacked structure were designed by using double-capping procedure and strain control of buffer layer during the growth of QDs structure. We have fabricated four types 3 layer QDs array waveguide LED, and compared the electro-luminescence spectrum of these devices. To obtain the broadband spectrum, it is necessary to control the peak wavelength shift and the comparable output power of 3 layers. As a result, we have obtained more than 500nm FWHM and flat-topped spectrum of QDs LED.