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Modern infrared (IR) microscopy, communication, and sensing systems demandcontrol of the spectral characteristics and polarization states of light.Typically, these systems require the cascading of multiple filters,polarization optics and rotating components to manipulate light, inevitablyincreasing their sizes and complexities. Here, we report two-terminalmid-infrared (mid-IR) emitters with electrically controllable spectral andpolarization properties. Our devices are composed of two back-to-back p-njunctions formed by stacking anisotropic light-emitting materials, blackphosphorus and black arsenic-phosphorus with MoS2. By controlling thecrystallographic orientations and engineering the band profile ofheterostructures, the emissions of two junctions exhibit distinct spectralranges and polarization directions; more importantly, these twoelectroluminescence (EL) units can be independently activated, depending on thepolarity of the applied bias. Furthermore, we show that when operating ouremitter under the polarity-switched pulse mode, its EL exhibits thecharacteristics of broad spectral coverage, encompassing the entire firstmid-IR atmospheric window, and electrically tunable spectral shapes. Ourresults provide the basis for developing groundbreaking technology in the fieldof light emitters.

Van der Waals heterostructure mid-infrared emitters with electrically controllable polarization states and spectral characteristics