In Italy and France as Reuters first team experimentally observed high-intensity light emission phenomenon 7 atoms wide graphene nanoribbons, the intensity of the light emitting device made of carbon nanotubes considerable, and may change the color by adjusting the voltage. This major discovery is expected to greatly promote the development of graphene light sources. The relevant results were published in the latest issue of Nano Express.
The graphene nanoribbon is suspended by the tip of the microscope to show bright light.
The new study was completed by the research team at the CNR Nanoscience Institute in Italy and the University of Strasbourg, France. According to the researchers, in general, the basic system of molecular-scale devices is very interesting, but quite unstable, resulting in a limited amount of signal. However, this study demonstrates that a single graphene nanoribbon can be used as a strong, stable, and controllable source of light, a decisive step in the application of nanoorganic systems to the real world of optoelectronics.
Although the excellent electronic properties of graphene are widely studied, scientists know very little about their optical properties. One of the disadvantages of using graphene as a light-emitting device is that the graphene sheet does not have an optical band gap. However, recent research has shown that when graphene is cut into thin strips of several atoms wide, a considerable optical band gap is obtained, which brings about the possibility of luminescence.
The experimental results indicate that graphene nanoribbons have great potential to be developed. Tests have shown that a single graphene nanoribbon exhibits a strong optical emission of up to 10 million photons per second, which is 100 times more powerful than that of a single-molecule optoelectronic device, comparable to a light-emitting device made of carbon nanotubes.
In addition, the researchers also found that the electrical energy conversion changes with voltage, which makes it possible to adjust the color of the light. These observations have paved the way for further exploration of the potential mechanism of graphene nanoribbon luminescence.
In the future, researchers will also explore the effect of the width of graphene nanoribbons on the color of the luminescence, as it is expected to use this width adjustment to control the bandgap size. Of course, the most important thing is to focus on how to integrate graphene nanoribbon devices into larger circuits.
Editor: Yan Zhixiang
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