High-efficiency light-emission from novel GaAs deep-centers for high-speed 1.5 μm fiber-optics

We demonstrate the first LEDs at 1.3-1.5 μm using GaAs deep-centers having higher (90%) efficiencies and larger Einstein B-coefficients than bulk InGaAs. An observed absence of deep-center self-absorption (Franck-Condon shift) could make possible near-zero threshold lasers.