According to the Niels Bohr Institute at the University of Copenhagen in Denmark;
The NBI study confirms that leds made with nanowires use less energy to provide a brighter light source.
By delving into nanowires using X-ray microscopy, the researchers were able to determine how to design them to provide the best performance.
The findings were published in the scientific journal ACS Nano.
The size of the nanowire is only about 2 microns high (nanometer m).
1 mm is 1/1000mm), about 10-500 nm in diameter (nm, 1nm about 1/1000 nm).
The LED nanowires are made of an inner GaN core and an outer gallium indium nitride (InGaN), both semiconductor materials.
The source of the dipole depends on the mechanical strain between the two materials, which depends largely on how the two materials interact with each other.
Robert Feidenhansl, a professor at the university of Copenhagen and director of the Bohr institute in Denmark, explained that we have studied a variety of nanowires using X-ray microscopy, even those that are essentially the same, and we can see the differences and quite different structures.
The research was conducted using nanoscale X-ray microscopy at the German institute for electron synchrotron research (DESY) in Hamburg, Germany.
Although this approach is time consuming, the results are often limited or even limited to a single research topic.
However, the special design of nanoscale x-rays allows the researchers to measure a range of nanowires simultaneously without breaking them in the process.
X-ray images of each nanowire show distribution of scattering intensity and mechanical strain on the outer layers of gallium nitride core and gallium indium nitride.
According to this strain, the outer layer perfectly matches the core.
(source: University of Copenhagen)
"We measured 20 nanowires and were very surprised when we saw the images because you can see the details of each nanowire, both the core and the outer layer.
If there is any defect or slight bend in the structure, it will not work properly.
So we can find out exactly which are the best nanowires and which have the most efficient core/shell structure, "explains Tomas Stankevic, a doctoral candidate in the neutron and X-ray scattering research group at the Bohr institute at the university of Copenhagen.
Robert Feidenhans 'l says the nanowires will bring a more natural light source to the leds and will use less power.
They can also be used in smartphones, televisions and various forms of lighting.
The researchers expect the nanowire LED lighting to be commercially available within five years.