The physical properties of GaSb are briefly presented and the device i
mplications reviewed. GaSb is a direct gap semiconductor (0.72 eV) cap
able of being doped either p or n type with good mobilities and it has
significant electro-optical potential in the near IR range. As a subs
trate, or active layer, GaSb can be employed in conjunction with many
semiconductors such as (AlGa)Sb or In(AsSb) and has interesting hetero
junction potential for detectors and lasers and quantum well structure
s.