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An LED that can be integrated directly into computer chips

Massachusetts Institute of Technology The advance could cut production costs and reduce the size of microelectronics for sensing and communication. MIT researchers have developed a bright, efficient silicon LED, pictured, that can be integrated directly onto computer chips. The advance could reduce cost and improve performance of microelectronics that use LEDs for sensing or communication. Courtesy of the researchers Courtesy of the researchers Light-emitting diodes – LEDs – can do way more than illuminate your living room. These light sources are useful microelectronics too. Smartphones, for example, can use an LED proximity sensor to determine if you’re holding the phone next to your face (in which case the screen turns off). The LED sends a pulse of light toward your face, and a timer in the phone measures how long it takes that light to reflect back to the phone, a proxy for how close the phone is to your face. L

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