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Controlling the emission frequency of graphene nanoribbon emitters based on spatially excited topological boundary states

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Abstract

Graphene nanoribbons (GNRs) with atomically precise heterojunction interfaces are exploited as nanoscale light emitting devices with modulable emission frequencies. By connecting GNRs with different widths and lengths, topological boundary states can be formed and manipulated. Using first-principles-based atomistic simulations, we studied the luminescence properties of a STM GNR junction and explored the applications of these topological states as nanoscale light sources. Taking advantage of the ultrahigh resolution of the STM tip, direct injection of high energy carriers at selected boundary states can be achieved. In this way, the emission color can be controlled by precisely changing the tip position. The GNR heterojunction can therefore represent a robust and controllable light-emitting device that takes a step forward towards the fabrication of nanoscale graphene-based optoelectronic devices.

Graphical abstract: Controlling the emission frequency of graphene nanoribbon emitters based on spatially excited topological boundary states

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Article information


Submitted
14 Dec 2019
Accepted
27 Feb 2020
First published
27 Feb 2020

Phys. Chem. Chem. Phys., 2020, Advance Article
Article type
Communication

Controlling the emission frequency of graphene nanoribbon emitters based on spatially excited topological boundary states

X. Wu, R. Wang, N. Liu, H. Zou, B. Shao, L. Shao and C. Yam, Phys. Chem. Chem. Phys., 2020, Advance Article , DOI: 10.1039/C9CP06732A

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