LED industry in August 16 disruptive new technology highlights

LED industry in August to complete the 16 major new technology perfect! Presumably the scientists are playing chicken, do not stop! Invention and creation!

These 16 new technologies focus on the following two themes: first, low cost and high efficiency; the second, unlimited expansion of innovation. At the same time, these 16 new technologies can be divided into materials, preparation, application of the three major categories of technology, each of the valuable points of technology, perhaps will bring disruptive changes in the LED industry!

Materials technology

1, two graphene Technology

(1) tunable graphene LED

Content: the research team at the Tsinghua University from two kinds of graphene produced a new luminescent material, the first time in proving the lighting system of graphene materials based on only a LED can adjust the light of different colors, all colors covering almost the whole visible spectrum. Which cover from 450 nm to 750 nm wavelength blue wavelength red light, except deep blue and violet.

Value: this groundbreaking research results in the acquisition of color fidelity, but also significantly reduce the number of light-emitting devices display devices, which greatly optimize the circuit and thus reduce power consumption. LED can be used to break through the color of the existing display device color synthesis, is expected to have a revolutionary impact on the display, lighting and communication technology. Since the color of light varies with a particular chemical, such devices may also be used to make special sensors.

(2) a new technique for the growth of graphene nanoribbons

Content: University of Wisconsin (University of Wisconsin) and Argonne National Laboratory (Argonne National Laboratory) researchers, found a way to grow the semiconductor graphene 10nm wide band, it has the armchair edge (armchair, edge) through nano width to achieve a variety of different energy gap.

Value: the research team found that the most important is the graphene can easily direct growth of armchair edge in the germanium surface low cost on the belt, and thus become a custom semiconductor silicon 10 times faster.

2, two fluorescent powder, fluorescent material technology

(1) LED phosphors without rare earth

The American team of researchers has produced LED white light phosphors on the basis of a mixture of phosphorus, metal and organic light-emitting molecules that are rich in soil. By changing the metal and the organic components, the color of the visible light spectrum of the human eye can be adjusted systematically. The team will also continue to test the development of other metals and organic compounds based on rare earth free LED phosphors.

Value: the current LED technology is usually the use of a single semiconductor chip to produce blue light, and then rely on yellow phosphor coating will be converted to white color. The phosphor is made of yttrium aluminum garnet doped with cerium (consisting of rare earth elements). These rare earth elements are very expensive and limited in supply. Therefore, the technology does not contain rare earth LED phosphor can make the LED longer life, higher efficiency, lower cost, allegedly able to reduce the cost of LED 90%.

(2) new achievements of fluorescent materials and their photochromic mechanism

Through a series of experimental methods and theoretical calculation, the author gives a new explanation to the intrinsic mechanism of the spectra, which is the red shift of the spectra, the decrease of the intensity and the variation of the thermal stability of Gd ions. That is because Gd larger ionic radius, the rigid structure of yttrium aluminum garnet will cause the electron cloud extrusion deformation, resulting in crystal field enhancement, the electron effective mass loss, spreading and expand the scope of electronic energy band gap decreases, which leads to the decrease of thermal stability and decrease luminous efficiency.

Value: the technology can guide the development of the artificial gem crystal has a specific color, giving more bright and colorful color, such as a variety of artificial diamonds, sapphires and rubies, not only has high light transmittance and reflectance, and can be customized to a specific color bright eye-catching.

3, phosphorus light-emitting materials

Content: the Australian National University (Australian National University; ANU) scientists use tape repeatedly in the black crystalline form of phosphorus stripped out of the increasingly thin crystal layer, thereby creating phosphorus. In addition to create a semiconductor thinner than silicon, phosphinidene also has the luminescent properties and the thickness of different layers, by changing the number, to strictly control the energy gap, determine the properties of the material such as a color LED.

Value: because of the light and thin phosphorus, so as to create a lot of interesting devices to create opportunities, such as LED or solar cells, showing a very promising luminescent properties. The performance of phosphorus in the thin layer is better than that of silicon, because the surface state of the phosphor can be minimized, which is different from that of the surface state which is too thick to be used in the thin state.

Two, preparation technology

1, quantum dot technology

Content: researchers at the Oregon State University demonstrated a new quantum dot manufacturing technology, using a chemical reactor called "continuous flow", the chemicals are continuously introduced into the reactor and continuous LED lighting. At the same time, the use of microwave heating reagents, to solve the problem of how to accurately control the temperature of the chemical reaction.

Value: the "continuous flow" device makes the process of LED lighting cheaper, faster, and highly scalable. The technology does not