GaSb, or gallium antimonide, is a compound semiconductor made from gallium and antimony. It is known for its narrow bandgap, which makes it useful in infrared applications, such as detectors and lasers. GaSb is often used in optoelectronic devices due to its ability to efficiently convert electrical energy into light. In addition to its applications in infrared technology, GaSb is also used in high-speed electronics and thermophotovoltaics. Its unique properties allow for effective performance in various temperature ranges, making it a valuable material in both research and industrial settings.