Communications of the ACM
An LED That Can Be Integrated Directly Into Computer Chips
Massachusetts Institute of Technology researchers have developed a bright, efficient silicon LED that can be integrated directly onto computer chips.
Credit: Jin Xue et al.
A silicon-based LED that can be integrated directly onto a computer chip has been fabricated by Massachusetts Institute of Technology (MIT) researchers and the GLOBALFOUNDRIES company.
The LED is sufficiently bright to enable state-of-the-art sensor and communication technologies, and features specially engineered junctions to augment brightness. \
The device generates enough light to send signals through 5 meters (16.4 feet) of fiber-optic cable.
MIT's Jin Xue said the silicon LED switches on and off faster than expected, and was used to transmit signals at frequencies up to 250 megahertz.
The University of California at Berkeley's Ming Wu said, "It allows silicon integrated circuits to communicate with one another directly with light instead of electric wires. This is somewhat surprising as silicon has an indirect bandgap and does not normally emit light."
From MIT News
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