In0.5P0.5Ga0.5As0.5

In₀.₅P₀.₅Ga₀.₅As₀.₅ is a quaternary III-V semiconductor alloy combining indium phosphide and gallium arsenide in equal proportions, engineered to achieve intermediate bandgap and lattice parameters between its binary end-members. This material exists primarily in research and development contexts, where it is studied for optoelectronic and high-frequency applications that require tunable electronic properties; the lattice-matched or near-lattice-matched character of such quaternary alloys enables heterostructure design for infrared emitters, photodetectors, and high-electron-mobility transistors (HEMTs) that cannot be realized with single binary compounds alone.