GaAs0.99P0.01

GaAs₀.₉₉P₀.₀₁ is a III-V compound semiconductor alloy formed by introducing a small amount of phosphorus into gallium arsenide, creating a direct-bandgap material with a bandgap energy slightly larger than pure GaAs. This alloy is primarily used in optoelectronic devices, particularly light-emitting diodes (LEDs) and laser diodes operating in the near-infrared region, where the minor phosphorus incorporation allows fine-tuning of the emission wavelength compared to pure GaAs while maintaining high quantum efficiency and fast carrier dynamics. Engineers select this composition when a specific wavelength between pure GaAs and higher phosphorus-content GaAsP alloys is required, or when performance characteristics of pure GaAs are nearly optimal but minor bandgap adjustment is needed for particular detector or emitter applications.