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Green LEDs Take a Semipolar Route

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Hank Hogan

Green LEDs, which comprise thin films of GaN doped in various ways, present problems when the upper films are grown along a polar direction of the GaN crystal. For example, strong polarization-induced electric fields are produced and lead to a blueshift in the peak emission at high LED drive currents. Unfortunately, it is much harder to grow the film along a nonpolar direction, so most commercial LEDs take the polar approach. A group from the University of California, Santa Barbara, now has demonstrated an alternative in the use of a semipolar direction. The green LED is grown along a...Read full article

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    Published: February 2006
    FeaturesGaN crystalGaN dopedGreen LEDsLight SourcesLEDs

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