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HRXRD scans for the (0002) reflection from the blue and green LED structures. The thicker curves are the simulations from the Philips X’pert Smoothfit.
HRTEM images of blue (a), (c) and green (b), (d) MQWs. The dark line-shaped pattern is the well region. Clearly from the images of larger magnification, the density of the stacking fault (as pointed by the white arrow) in the blue MQWs is much higher than that in the green MQWs.
Room temperature EL characteristics including emission energy (a), emission energy FWHM (b), and power output (c) as a function of the driving current.
The broadening of room temperature EL emission energy of the blue and green LEDs at different driving currents. The emission energy peaks of the green LED are lined up to the saturated position in order to clearly observe that the broadening mainly occurs at the higher energy side. The insets are the enlargements of the curves around the half of the normalized intensity.
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