Graphene spoiler LED industry, rare earth elements must stand aside?

Back in 2014, when the tail Chinese A stock market is around 7 years of bear market, but the collective Shi Moxi stocks soared trend, limelight without the two, in a wink, this new material has become a hot topic among people. As a new material 200 times stronger than iron and steel, graphene is only one atomic thickness, but also more flexible, conductive, high transmittance and many other high quality performance in one. It is understood that graphene has existed in nature, but it is difficult to peel out a single layer structure. The graphene layer is stacked graphite, 1 mm thick graphite contains about 3 million layers of graphene. For example, with a pencil on paper gently across, leaving traces may be several or even just a layer of graphene. Statistics show that in 2004, the University of Manchester physicist Andre Geim and Konstantin Novoselov, successfully isolated graphene from graphite, that it can exist alone, two people therefore jointly won the 2010 Nobel prize in physics. However, scientists are now found only by more than 10 years, the global graphene preparation technology and industrial applications are in the initial stage. Graphene is a new kind of nano material, which has been found to be the most thin, the most powerful and the most conductive and thermal conductivity". Some scientists even predict that graphene will completely change in twenty-first Century, which is likely to set off a sweeping global disruptive new technology and new industrial revolution. This is so much "halo" blessings, "sparkling new materials", now get the research results and a new stage, indeed gratifying. Xiao Bian today to talk about the application of this in our LED industry prospects, but also the new material widely favored - graphene". Rare earth elements? Recently, domestic and foreign scholars have made important progress in the research and development of graphene. First, researchers from the National Tsinghua University, China, in an article published in the ACSNano, claiming that the use of rare earth elements outside the material can be made of white light LED products. According to reports, this LED is based on the alkali metal strontium, built a metal organic framework (MOF), in the upper and lower MOF were combined with graphene and other materials, constitutes a direct white light LED. The MOF mentioned here is formed by the combination of metal ions and organic materials. Over the past 20 years, it has been widely used in chemical separators, drug delivery, gas storage, catalysis and other fields. However, because of the general porous MOF, poor conductivity, has been very difficult to see this material in the field of optoelectronics. In fact, in the early stages of the study, the white light can be emitted by the basic MOF is composed of different kinds of rare earth elements together. In order to solve the above problems, the researchers have to switch to the elements with good conductivity, at the same time, the element should be able to emit the light of the frequency band. So the researchers tried to use the organic ligand, the use of alkaline earth metal strontium to prepare MOF materials. They said that on the MOF surface, plus a transparent electrode graphene, both improve the carrier mobility, and will not affect the optical properties. Due to the excellent thermal conductivity of graphene, the new white light diode has better thermal conductivity. Researchers in the periphery of the MOF material, but also a combination of graphene, silica, Zinc Oxide, so that it can be driven by electric light. The use of MOF materials to create light-emitting devices, no doubt gives people a new idea. The test results also show that, as the light emitting device, the display range is very close to natural light, as a semiconductor device, its stability is better, during the two months of testing, there is almost no performance degradation. On the other hand, this material is more environmentally friendly. Rare earth elements in the current situation is less and less, the new LED does not use rare elements, significantly reducing the amount of use, can really play a role in saving resources. In addition, to reduce the exploitation of rare earth elements, resulting in environmental pollution, but also can be effectively controlled. And, because the light emitted by the new material is very close to the natural light, there will be no strong blue light. Because no other color light is blocked, the luminous efficiency can be greatly improved. Reduce power consumption, greenhouse gas emissions will be reduced. The graphene "zero defect", there are many enterprises in the production of "graphene" world, because it is a two-dimensional material, graphene can produce high quality structure of "zero defect" but is less and less. Although the prospects for the development of graphene has been well received, but from the past, the global researchers have been looking for the manufacture of low-cost methods of defect free graphene. The good news is that the German chemist recently announced the discovery of a method for the production of defect free graphene. The message refers to the current graphene manufacturing technology, the size of the product, size and defects (affect conductivity) and other aspects have yet to be improved, so the semiconductor industry has not yet been applied graphene. Finally, in the near future, a team led by Professor FAU AndreasHirsch research team to reduce the defects in the graphene breakthrough. According to foreign media reports, the German El long roots - Nuremberg University (FAU) chemists have now taken the lead in the success of