Mid-infrared Polarized Emission from Black Phosphorus Light-Emitting Diodes

We demonstrate a mid-infrared light-emitting diode based on the 2D semiconductor black phosphorus (BP). The device is composed of a mechanically exfoliated BP/molybdenum disulfide heterojunction. Under forward bias, it emits polarized electroluminescence at λ = 3.68 μm, with room-temperature interna...

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Bibliographic Details
Published in:Nano letters Vol. 20; no. 5; pp. 3651 - 3655
Main Authors: Wang, Junjia, Rousseau, Adrien, Yang, Mei, Low, Tony, Francoeur, Sébastien, Kéna-Cohen, Stéphane
Format: Journal Article
Language:English
Published: United States American Chemical Society 13.05.2020
Subjects:
heterostructures
black phosphorus
light-emitting diodes
mid-infrared emitters
2D materials
ISSN:1530-6984, 1530-6992, 1530-6992
Online Access:Get full text
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Summary:We demonstrate a mid-infrared light-emitting diode based on the 2D semiconductor black phosphorus (BP). The device is composed of a mechanically exfoliated BP/molybdenum disulfide heterojunction. Under forward bias, it emits polarized electroluminescence at λ = 3.68 μm, with room-temperature internal and external quantum efficiencies of ∼1% and ∼0.03%, respectively. In our structure, outcoupling losses are dominated by radiation toward the high refractive index substrate. The ability to tune the bandgap of BP and consequently its emission wavelength with layer number, strain, and electric field make these LEDs particularly attractive for heterointegration into mid-infrared photonic platforms.
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ISSN:1530-6984
1530-6992
1530-6992
DOI:10.1021/acs.nanolett.0c00581