https://www.ostphotonics.com/products/gaas-wafers.html OST Photonics gaas epi wafer GaAs is a semi-conductor material with excellent performance characteristics including direct band gap, high electron mobility, high-frequency low noise, and high conversion efficiency. The RF devices produced with GaAs substrates are commonly used in wireless communication applications, including wireless networks (WLAN), mobile communication, 4G/5G base stations, satellite communications, and WiFi communications. With the development of mini-LED and micro-LED, red light LEDs produced with GaAs substrates are increasingly used for display screens and in AR/VR.