The Latest 9 Big LED Innovative Technologies

LEDs are breaking down barriers, initially tiny red lights on the switch panel, and now they're everywhere, from screens to walls, ceilings to wearable devices. LED is advancing at a high speed, producing new breakthroughs and innovations. Here is a brief introduction to some progress in LED technology, which promises to make our world better.

1. the world's first full color GaN based LED
The Ostendo EpiLab laboratory in South California developed the world's first RGB LED. The LED is based on GaN technology, using three specific materials to form a quantum structure, can emit different colors of light, color LED can emit light alone or mixed. Conventional LED is usually monochromatic and can only transmit a single wavelength. To achieve the colorful RGB lighting effect, it is necessary to use multiple LED to mix and achieve the desired color.

The color is determined by the phosphor coating or substrate material of LED. Only a few researchers have tried to create a single LED chip that can launch a full range of RGB colors.

2. GaN to make green light LED brighter.
Electronic and computer engineering scientists at the University of Illinois at Champaign have developed a new way to make brighter, more efficient green LEDs. Gallium nitride (GaN) cubic crystals were grown on silicon substrates using industry standard semiconductor growth methods to generate strong green light for solid-state illumination.

Usually, GaN forms one of the two crystal structures: six side crystal or cubic crystal. Six square GaN is thermodynamically stable and is a conventional form used in semiconductor applications. However, hexagonal GaN is prone to polarization, and the internal electric field separates the negative electrons from the positrons, preventing them from binding, thus reducing the optical output efficiency.

3. use new materials to create high efficiency white LED
Researchers at Tsinghua University in Taiwan recently published a paper in the scientific journal ACS Nano that successfully used new materials instead of rare earth metals to make white LED products. This LED is basically made of alkali strontium, combined with metal organic framework (MOF), MOF upper and lower layers of graphene and other materials, respectively, made of white LED. LED made of new materials can emit beams of similar quality to natural light and do not emit intense blue light. Lumen efficiency is significantly improved because it does not need to filter out other colors.

4 Japan has developed red light LED without rare elements.
Tokyo Polytechnic University and Kyoto University have announced that they have developed red light-emitting semiconductors that do not use expensive and rare elements.

Researchers are turning to earth-rich elements as alternatives, such as nitrogen and zinc as screening criteria. Low cost materials can reduce the production cost of red LED and solar cells.

5. inhibition efficiency of mixed nanocrystals decreases LED
Researchers at Nanjing University have discovered a new application of hybrid nanocrystals to fill holes in InGaN or GaN LED structures to significantly improve the luminous efficiency of white LEDs.

These studies, published in the Journal of Applied Physics Letters, point out that the key to improving color conversion efficiency (CCE) is determined by effective non-radiative resonance energy transfer rather than by combining blue InGaN/GaN LEDs or down-conversion materials (such as phosphorus or even semiconductor nanocrystals).

Progress of 6. UV LED free form light distribution technology

Chongqing Institute of Green Intelligent Technology, Chinese Academy of Sciences, has made important progress in the application of UV LED free-form surface light distribution technology. UV LED light source has been successfully used in the field of exposure machine. The products have been applied in PCB, LCD panel, touch screen and other industries. The traditional parallel light exposure machine uses high-pressure mercury lamp as light source, its life is only 1000 hours, high power consumption, and pollution. Using UV LED to replace the mercury lamp, the life of the lamp can reach 50 times of the mercury lamp, and the power consumption can be reduced by 90%. The production cost of the enterprise can be greatly reduced, and the environmental protection and pollution-free can be achieved.

At present, Chongqing Research Institute has broken through the key technologies of LED multi-free-form surface precise light distribution and processing of inorganic optical elements suitable for ultraviolet wave band. For the first time, a parallel light exposure head based on ultraviolet LED has been developed. The parallel half-angle can be controlled within (+) 2 degrees, the illumination inhomogeneity is less than 3%, and the illumination intensity is as high as 40mW/cm2.

7. new breakthroughs in LED heat sink
Li Kuan'an, senior engineer of China Light Industry Federation, introduced an innovative LED cooling technology with independent intellectual property rights. These companies have been able to successfully remove all obstacles, and to use wire forms and fan forced cooling, and to achieve good heat dissipation. Inventor Zhang Yixing pointed out that the design solved the heat dissipation problem, met the "high efficiency, high reliability, low cost" LED drive power demand, fundamentally solved the two major problems in the development of LED.

8. new materials provide longer life for white LED.
Professor Xiang Weidong of the School of Chemistry and Material Engineering of Wenzhou University invented innovative materials, which prolonged the service life of LED lamps for nearly 10 years. Long-term lighting makes this material more widely used in luxury cars, high-speed railways, aircraft, subway and other lighting applications.

Xiangdong spent many years yellowing on a single LED chip that could be synthesized at a high temperature of 2000 C. If a blue LED chip is paired with a 5.5mm *5.5mm 24W light source on a single chip, the Yellow single crystal material can emit white light steadily. Because of its high thermal resistance and high conductivity, LED lamps have greater elasticity and longer life. LED bulbs are not easily damaged by high temperature after long-term illumination. They are suitable for lighting applications in luxury cars, automotive lights, high-speed railways, aircraft and submarines.

9. Mercedes Benz launches independently controlled LED headlights
Mercedes-Benz has launched a multi-beam LED headlight with 84 LED light sources to achieve higher light output resolution. This will enable other road users to better prevent blindness and improve the lighting of the road ahead of the driver.

Since the light distribution is completely configurable, it is the first time that all the high and low beam functions of the intelligent lighting system can be realized in a fully digital mode without any mechanical actuator. This will make a large number of new adaptive lighting functions possible and will make night driving safer.

The technology is developing rapidly: Soon, each LED chip will have 1,024 pixels that can be controlled independently, further improving night visibility and thus further improving security. Partners such as Infineon, Osram, Fraunhofer Gesellschaft IZM, Hella and Daimler have made breakthroughs in the "muAFS" research project, and the new LED chips are very sophisticated in structure. The monolithic pixel LED semiconductor layer is built on a silicon substrate. Through integrated circuits, each LED chip allows selective control of 1024 individually addressable pixels.