Scientists Create World's Thinnest Light Bulb Using Graphene

Suspended graphene emitting light / Young Duck Kim via Columbia Engineering

While researchers have managed to fit many different devices onto tiny computer chips, it has been an ongoing struggle to achieve the same feat for the light bulb. However, it seems they've finally managed it. The reason light bulbs never previously featured on computer chips is because they need to reach thousands of degrees Celsius to emit light. These temperatures, while producing light, damage the surrounding chip. 

How have researchers overcome this? By using an amazing material that has permeated our lives: graphene. As described in Nature Nanotechnology, scientists have created an atomically thin graphene filament that is integrated with a computer chip. When an electric current runs through the filament, it heats up enough to emit light. 

So why hasn't the graphene melted the chip like a filament bulb would? It turns out it's because graphene has an interesting property: when it heats up, it becomes a poor conductor of heat. Thus, the heat it creates is confined to the filament and doesn't melt the surrounding chip.

The light bulb happens to be the thinnest in the world at only one atomic layer thick. You can see how tiny it is in the photo.

Optical (left) and Micrograph (right) images of the graphene light courtesy of Young Duck Kim/Columbia Engineering

Working in the microscale comes with its own set of unique challenges. Young Duck Kim explains to IFLScience: "It is impossible to distinguish a material that is only a single atom in thickness by the naked eye. Handling and working with atomically thin materials is not trivial and requires many special techniques."

The little light is also hardy: "Light emission from graphene is very robust due to the highest mechanical stiffness and high stability of graphene at high temperature," Kim told IFLScience. He also commented that they can make a light that flashes very quickly. Such a robust device can potentially have many uses.



Bright Visible Light Emission in Graphene courtesy of Myung-Ho Bae/KRISS

Young Duck Kim explained how the light solves a few pesky problems that have been plaguing companies like Intel, whose state-of-the-art light sources aren't even integrated into computer chips. Additionally, their lights use expensive and complicated connections (including copper). This graphene light, on the other hand, is low cost with a relatively simple structure.

Do this mean you can expect to see graphene lights in your house any time soon? "First, we can easily make flexible and transparent graphene lighting, which we can attach to the window and wall," Kim told IFLScience. "And, what’s even more exciting, is that we can use graphene light to develop flexible and transparent smartphones and tablets. Graphene light will transform the chips in our computers and smartphones, so that they can process information with light, which mean it will be faster, in a more compact form, and with less energy consumption. This could happen very soon!"

[Via Nature Nanotechnology, Columbia University]

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