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Summary: Nitride-based light-emitting diodes are reaching
unprecedented efficiencies, but extracting the light
that is generated inside the diode is still a major
challenge. Professors Jim Speck, Steve DenBaars,
and Shuji Nakamura are addressing this problem by
combining the LEDs with a transparent conducting
oxide. A thin ZnO layer doped with Ga is deposited
on the surface of the diode and used as a transparent
contact. ZnO is much less expensive than gold,
titanium, or indium-based oxides, which are the
materials that are commonly used as transparent
contacts today. In addition, ZnO lends itself to being
shaped into a millimeter-sized cone that can be
bonded to the device. This geometry allows light
extraction with unprecedented efficiency.
Nitride-based light-emitting diodes are reaching
unprecedented efficiencies, but extracting the light
that is generated inside the diode is still a major
challenge. Professors Jim Speck, Steve DenBaars,
and Shuji Nakamura are addressing this problem by
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