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Take stock of 9 major LED technology innovations

  • Author:Eunice
  • Source:net
  • Release on :2017-12-29
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      LEDs are breaking barriers, at first it was just a tiny red light on the switch panel, and now it's everywhere, from screens to walls and ceilings to wearable devices. Now LED is high-speed forward, and constantly produce new breakthroughs and innovations. Here's a brief introduction to some of the advances in LED technology that are expected to make our world a better place.

The world's first full-color gallium nitride LED

       South California State Ostendo Epilab Laboratory developed the world's first RGB LED. This LED is based on the GAN technology, the use of three specific materials to form a quantum structure, can emit different colors of light, color led can be individually light-emitting or mixed light. Traditional LEDs are usually monochrome and can only emit a single wavelength. To achieve a colorful RGB lighting effect, you need to use multiple LEDs to mix to achieve the desired color.

      Color is determined by the phosphor coating or substrate material of the LED. Only a handful of researchers have tried to create a single LED chip capable of emitting a full range of RGB colors.

Gan makes green LED brighter

      Electronics and Computer Engineering scientists at the University of Illinois at Urbana-Champaign have developed a new way to produce brighter, more efficient green LEDs. With the industry-standard semiconductor growth method, gallium nitride (Gan) cubic crystals are grown on silicon substrates, producing powerful green light for solid-state illumination.

     Generally, Gan forms one of two crystalline structures: six square crystals or cubic crystals. Hexagonal gan is stable in thermodynamics and is a conventional form used in semiconductor applications. However, six-square gan is more prone to polarization, and the internal electric field separates the negative electrons from the positron and prevents them from binding, thus reducing the optical output efficiency.

Use new materials to make efficient white LEDs

       Researchers at Tsinghua University in Taiwan recently published a paper on the ACS Nano, a science magazine, that successfully used new materials instead of rare-earth metals to produce white-light LED products. This LED is basically made of alkali metal strontium, combined with the Metal Organic Framework (MOF), which is combined with graphene and other materials on the MOF's upper and lower layers, and is made of white light LEDs. LEDs made from new materials emit beams of similar mass to natural light and do not emit strong blue light. Lumen efficiency is significantly higher because it does not have to filter out other colors.

Japan develops red LEDs without rare

      The Tokyo Institute of Technology and Kyoto University have jointly announced the development of Red light-emitting semiconductors that do not use expensive rare.

      Researchers are turning to the use of rich elements of the earth as a substitute, such as the use of nitrogen and zinc as the criteria for screening methods. Low-cost materials can reduce the production costs of red LEDs and solar cells.

Mixed nano-crystal led suppression efficiency drop

      Researchers at Nanjing University have discovered a new application of hybrid nanocrystals that can be used to fill holes in InGaN or GAN led structures to significantly increase the lumen efficiency of white LEDs.

      The study, published in the journal Applied Physics Letters, points out that the key to improving the efficiency of color conversion (CCE) is determined by effective radiation-induced resonance energy transfer, rather than the combination of Blu-ray Ingan/gan LEDs, or down-conversion materials (such as phosphorus or even semiconductor nanocrystals).

Progress of UV LED free-form surface light distribution technology

      The Integrated Photoelectric Technology Research center of Chongqing Institute of Green Intelligent Technology of Chinese Academy of Sciences has made important progress in the application research of ultraviolet led freeform surface light distribution technology, and has succeeded in applying ultraviolet LED light source to the field of exposure machine, which has been applied in PCB, LCD panel, touch screen and other industries. The traditional parallel light exposure machine uses the high-pressure mercury lamp as the light source, its life is only 1000 hours, the power consumption is high, and has the pollution. The use of uvled replacement mercury lighting source, life can reach Mercury lamp 50 times times, power consumption can be reduced by 90%, significantly reduce production costs, environmental pollution-free.

      At present, Chongqing Research Institute has broken through the LED multi-freeform surface precision distribution, suitable for ultraviolet band of inorganic optical element processing, such as key technology, first developed based on ultraviolet led parallel light exposure head, parallel half angle can be controlled within the ±2°, illumination uniformity less than 3%, lighting intensity up to 40mw/cm2.

New breakthrough of LED cooling device

      Senior Engineer of China Light Industry Federation Li Quan introduced an innovative led cooling technology with independent intellectual property rights. These companies are able to successfully eliminate all obstacles and use wire form and fan-forced cooling, and to achieve good cooling effect. Inventor Zhang Yixing pointed out that the design to solve the problem of heat dissipation, to meet the "high efficiency, high reliability, low-cost" led drive power demand, fundamentally solve the LED development of the two major problems.

New materials provide longer life for white LEDs

     Professor Xiangweidong of the School of Chemistry and Materials engineering, Wenzhou University, invented innovative materials to extend the life of LED lamps for nearly 10 years. Long-time lighting allows this material to be used more widely in luxury cars, high-speed railways, airplanes, subways and other lighting applications.

     It took many years for the ET to ℃ the yellow light on a single LED chip that could be synthesized at 2000 high temperatures. If a Blu-ray LED chip is paired with a 5.5mmx5.5mm 24W light source on a single chip, the yellow crystal can emit a stable white light. As the chip heat resistance, high conductivity, LED lamps will be more flexible, longer life. LED bulbs are not easily damaged by high temperature after prolonged illumination, and are ideal for lighting applications of luxury cars, car lights, high-speed railways, airplanes and submarines.

Mercedes-Benz launches independently controlled LED headlights


      Mercedes-Benz launched with 84 LED light source of multi-beam LED headlamps, so as to achieve higher optical output resolution. This will enable other road users to better prevent blinding, while improving the driver's road lighting ahead.

      Because the distribution of light is completely free, it is possible for the first time to realize all the high beam and low beam function of intelligent lighting system in full digital mode without any mechanical actuator. This will make a large number of new adaptive lighting features possible and will make night driving safer.

     The technology is rapidly evolving: soon, each LED chip has 1024 individually controlled pixels that will further improve nighttime visibility and further improve security. Infineon, Osram, Fraunhofer Gesellschaft izm, Hella and Daimler and other partners in the "ΜAFS" research project has made breakthroughs, the new LED chip structure is very fine. The monolithic pixel led semiconductor layer is built on the silicon substrate, and through integrated circuits, each LED chip allows the selective control of 1024 individually addressable pixels.

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