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Si as an emissive optical medium for the 3–12 μm band

The conventional methods of utilizing Si as a light-emitting medium are limited to the near-infrared band (λ<2 μm). Here we summarize our recent studies in silicon structures that efficiently and controllably emit radiation in the 3–12 μm band, including a novel device design and concepts for LEDs, dynamic scene simulation devices, optical amplifiers, and radiative coolers.