Less energy, higher brightness, nanowire LED will be commercially available in five years

According to eettaiwan news, the University of Copenhagen in Denmark (University of Copenhagen) Bohr Institute (Niels Bohr Institute; NBI) the study confirmed that the nanowires made of LED only need to use less energy, can provide better light bright.

The researchers studied the nanowires using X - ray microscopy, and by doing so, researchers were able to determine how nanowires were designed to provide the best performance. The findings appear in the scientific journal ACS Nano.

Nanowires are about 2 microns high in size (m, 1 m, 1/1000 mm) and have a diameter of about 10-500 nm (nm, 1nm, 1/1000 m). The nanowires for LED are made up of the internal gallium nitride (GaN) core and the outer layer of gallium nitride (InGaN), all of which are semiconducting materials (two).

The light source of this diode depends on the mechanical strain between the two materials, which vary greatly depending on how the two material layers touch each other. The University of Copenhagen professor and director of Bohr Robert Feidenhansl explained, we study a variety of using X ray microscopy of nanowires, even in principle the same nanowires, we can see the differences and the structure is quite different.

The study was conducted using nanoscale X ray microscopy at the German synchrotron electron accelerator (DESY) electronic synchrotron facility in Hamburg, germany. Although this approach is time-consuming, and the results are usually very limited, or even only a single research topic can be satisfied. However, the special design of nanoscale X - ray allows the nanowire to not be destroyed during the process, allowing researchers to successfully measure a series of nanowires simultaneously.

The X ray images of each nanowire show the distribution of scattering intensity as well as the mechanical strain in the Gan core and the GaN and indium layers. According to this strain, the outer layer agrees perfectly with the core.

(source: Northeastern, University)

"We measured 20 kinds of nanowires, and when we see images are very surprised, because you can clearly see every kind of nanowires in detail, including the structure of the two core and outer layer. If there is any defect in the structure or it is slightly bent, it will not function properly. So, we can accurately find out which is the best of the nanowires, with the highest efficiency and the core / shell structure, "the research team of University of Copenhagen Bohr Institute" neutron and X ray scattering "doctoral student Tomas Stankevic explained.

Robert Feidenhans, l, says the nanowires will provide LED with a more natural light source and will use less power. In addition, they can also be used in smart phones, TV sets and various forms of lighting.

The researchers predict that the nanowire LED lighting will be commercially available within five years.

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