Creating custom light with 2D material, The search for new semiconductor light-emitting materials is crucial for the development of a large number of electronic devices.
However, it is even more interesting to produce artificial structures that emit light that is tailored to our specific needs.
However, light emission in semiconductors only occurs when certain conditions are met. Today, researchers from the University of Geneva (UNIGE) in Switzerland, in collaboration with the University of Manchester, discovered a whole class of two-dimensional material that is one or more atom thick. Creating custom light with 2D material.
In combination, these thin atomic crystals can form structures that emit personalized light in the desired color.
Semiconductor materials that can transmit light are used in various fields such as telecommunications, lighting devices (LEDs) and medical diagnostics. Light is emitted when electrons in a semiconductor jump from a higher energy level to a lower one. The difference in energy determines the color of the light emitted.
To receive light, the velocity of electrons before and after the jump must be exactly the same, a condition that depends on the particular semiconductor material being considered.
Only a few semiconductors can be used to emit light: for example, silicon from which our computers are made cannot be used to make LEDs.
We wondered if two-dimensional material could be used to create structures that emit light from the desired color, the researchers said. A two-dimensional material is a perfect crystal which, like graphene, is one or more thick atoms.
Due to the latest technological advances, two different dimensional materials can be stacked with each other to form artificial structures that behave like semiconductors. The advantage of this “artificial semiconductor” is that the energy level can be controlled by choosing the chemical composition and thickness of the materials that make up the structure. Creating custom light with 2D material.
This type of artificial semiconductor was only produced two or three years ago, researchers explained. If two-dimensional material has the exact same structure and the crystals are perfectly aligned, this artificial semiconductor can emit light. But this is very rare.
This condition is so severe that it leaves little freedom to control the emitted light.
Our goal is to combine different two-dimensional materials to emit light and be free of any boundaries.
Physicists believe that this would be an ideal scenario if they could find a class of materials where the velocity of electrons before and after the change in energy level is zero, regardless of the details of the crystal lattice and their relative orientation. Creating custom light with 2D material.
A large number of two-dimensional semiconductors are known to have zero electronic speed at the appropriate energy level.
Thanks to these many connections, many different materials can be combined and each combination is a new artificial semiconductor that emits a certain color of light. Once we get an idea, it’s easy to find material that we can use to implement it.
Materials used in this study include various transition metal dichalkogenides (such as MoS2, MoSe2 and WS2) and InSe. Other materials that might have been identified and will be useful to expand the range of colors of this new artificial semiconductor. Creating custom light with 2D material.
“The great advantage of this 2D material is due to the fact that there are no more prerequisites for emitting light is that they offer a new strategy for manipulating light as they please with the energy and color we want.” said the researcher.
This means that it is possible to develop future applications on an industrial scale because the light emitted is strong and you no longer have to worry about aligning atoms.