Mid-infrared polarized emission from black phosphorus light-emitting diodes

Abstract

The mid-infrared (MIR) spectral range is of immense use for civilian and military applications. The large number of vibrational absorption bands in this range can be used for gas sensing, process control and spectroscopy. In addition, there exists transparency windows in the atmosphere such as that between 3.6-3.8 $\mu$m, which are ideal for free-space optical communication, range finding and thermal imaging. A number of different semiconductor platforms have been used for MIR light-emission. This includes InAsSb/InAs quantum wells, InSb/AlInSb, GaInAsSbP pentanary alloys, and intersubband transitions in group III-V compounds. These approaches, however, are costly and lack the potential for integration on silicon and silicon-on-insulator platforms. In this respect, two-dimensional (2D) materials are particularly attractive due to the ease with which they can be heterointegrated. Weak interactions between neighbouring atomic layers in these materials allows for deposition on arbitrary substrates and van der Waals heterostructures enable the design of devices with targeted optoelectronic properties. In this Letter, we demonstrate a light-emitting diode (LED) based on the 2D semiconductor black phosphorus (BP). The device, which is composed of a BP/molybdenum disulfide (MoS${}_2$) heterojunction emits polarized light at $\lambda$ = 3.68 $\mu$m with room-temperature internal and external quantum efficiencies (IQE and EQE) of ~1$\%$ and $\sim 3\times 10^{-2}\%$, respectively. The ability to tune the bandgap, and consequently emission wavelength of BP, with layer number, strain and electric field make it a particularly attractive platform for MIR emission.

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• Multilayer black phosphorus as a versatile mid-infrared electro-optic material
• Spatial-Temporal Imaging of Anisotropic Photocarrier Dynamics in Black Phosphorus

Cited by in corpus (7)

• Photonic integrated circuit polarizers based on 2D materials
• Roadmap for Photonics with 2D Materials
• Layer-dependent pressure effect on electronic structures of 2D black phosphorus
• Bright dipolar excitons in twisted black phosphorus homostructures
• Electronic structure of few-layer black phosphorus from $\mu$-ARPES
• Quantum well confinement and competitive radiative pathways in the luminescence of black phosphorus layers
• Straightforward Method to Orient Black Phosphorus from Bulk to Thin Layers using a Standard Green Laser