Less energy and higher brightness nanowires LED will be commercialized within 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 in this way, researchers were able to determine how to design nanowires to provide the best performance. The study was published in the Journal ACS Nano science.

The nanowire size is only about 2 m high (m; m is 1/1000 mm), the diameter is about 10-500 nm (nm, 1nm about 1/1000 m). Specially designed for LED nanowires are composed of an internal gallium nitride (GaN) core and an outer layer of gallium nitride (InGaN), two of which are semiconducting materials.

The light source of the diode depends on the mechanical strain between the two materials, which depends heavily on how the layers of the material are in contact with one another. 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 carried out by using the nano scale X ray microscopy in the electron synchrotron at the electron synchrotron Institute (DESY) in Hamburg, germany. Although this method is time-consuming, and the results are usually very limited or even only to meet a single research topic. However, the use of nanoscale X ray special design, can make the nanowires in the process will not be destroyed, so that researchers can successfully simultaneously measure a series of nanowires.

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

(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 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, "University of Copenhagen Bohr Institute" and "neutron X ray scattering research team doctoral student Tomas Stankevic explained.

Robert Feidenhans' l, said nanowires will bring more natural light source for LED, but also will use a lower power consumption. In addition, they can also be used in smart phones, televisions and various forms of lighting.

The researchers expect that this line of LED lighting can be commercialized within five years.

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