In order to use graphene earth light bulb?

In the LED into the public view of a few years in the process of technological progress and improvement of human demand plays a role in most. Even if the household did not damage the traditional lighting, has gradually been replaced by white LED. Because the white LED equipment has a huge advantage in power consumption and lighting effect. Although the popularity of LED products to the point, but it still faces a huge problem, raw materials of rare earth elements and is making LED less. In order to solve this problem, researchers are working on a rare earth element made from the new LED, rewrite the white LED technology now use graphene. At present, the white LED, also known as white LEDs, the white light is mainly achieved by single crystal, polycrystalline two ways. Polycrystalline mean by LED package of different colors together, through the complementary color display white light. The single way is simple, with a single blue LED and yellow phosphor on the surface of the yellow and blue light LED hybrid phosphor for white light, visual effect. The above two kinds of technology, can not avoid the use of rare earth elements. Recently, National Tsinghua University researchers published an article in the "ACS Nano", which points out that other researchers use rare earths materials that can emit white light LED products. This LED is based on the alkali metal strontium, build a metal organic framework (MOF), graphene materials are combined on MOF, which can directly emit white light LED. MOF is a very promising material, it is made of metal ions and organic materials with the formation of. In the past 20 years, widely used in chemical separation, drug delivery, gas storage, catalysis and other fields. In the photoelectric field is extremely difficult to see this material, because MOF generally porous, low conductivity. Early in the course of the study, can emit white light MOF is basically composed of different kinds of rare earth elements combined together. In order to solve the above problems, should use the elements of good conductivity, but also the elements will be capable of launching a band in the excitation light. With the change of organic ligands, the use of alkaline earth metal strontium preparation of MOF materials. On the surface of MOF, plus a transparent electrode of graphene, increase the carrier mobility, no special optical properties. Due to excellent thermal conductivity of graphene, new white light diode thermal conductivity is better. In the MOF periphery, the researchers combined graphene, silica, Zinc Oxide. In the light of electric drive. To create a light emitting device using MOF material, gives people a new way of thinking. The test results show that as the light emitting device, display range is very close to the natural light (green point map), as a semiconductor device, its stability is better, during the two months of testing, there is almost no performance degradation. In the performance, the more important the material environmental significance, due to the new LED without the use of a large number of rare elements, to reduce the amount of rare earth elements, rare earth elements and less now, reduce the use of rare earth elements are very important. At the same time, it can also reduce the exploitation of rare earth elements caused by environmental pollution. Light and natural light emitting materials very close to, does not have a strong blue light appeared. Because there is no other shade color light, the luminous efficiency can be greatly improved. The power consumption is reduced, greenhouse gas emissions will be reduced. From the LCD panel more common bulbs to electronic equipment in the equipment to start using LED as light source, no matter from the protection of resources, or from the protection of the environment, the emergence of new white LED technology are excellent.