Inventory is happening 9 LED technology innovation......

LED is to break the barriers, at first it is the switch panel for the tiny red lights, now everywhere has its shadow, from the screen to the walls and ceiling to wearable devices. Now LED is high speed, continue to produce new breakthrough and innovation. The following is a brief introduction to some progress of LED technology, which is expected to make our world a better place.

The world's first full color GaN based LED

Southern California Ostendo EpiLab laboratory developed the world's first RGB LED. This LED is based on GaN technology, using three kinds of specific materials composed of quantum structure, can emit light of different colors, color LED can separate light or mixed light. The traditional LED is usually monochromatic, and only a single emission wavelength. To achieve the RGB lighting effects and colorful, the need to use multiple LED to mix to achieve the desired color.

The color is determined by LED phosphor coating or substrate material. Only a few researchers attempting to create a single LED chip to transmit the full range of color RGB.

GaN LED let green light

Electronic and computer engineering University of Illinois, Urbana-Champaign scientists have developed a new method, can make brighter and more efficient green LED. The semiconductor growth method using industry standard, the growth of gallium nitride on silicon substrate (GaN) cubic crystals, for solid state lighting to generate strong green light.

Usually, one of the two crystal structure formation of GaN: six square or cubic crystal. Six square GaN is thermodynamically stable, and the traditional form is used in semiconductor applications. However, the six party GaN is easy to appear the polarization phenomenon, the internal electric field will negative electrons and positrons apart, preventing them from binding, thereby reducing the light output efficiency.

White LED manufacturing efficient use of new materials

Researchers at the National Tsinghua University in a paper published recently in the scientific journal ACS Nano, they succeeded in using new materials instead of rare earth metals to produce white LED products. This LED is basically made of alkali metal strontium, combined with metal organic framework (MOF), graphene and other materials are combined in the upper and lower MOF, made of white LED. Made of new material LED can be issued with natural light of similar quality beam, and does not emit strong blue light. Lumen efficiency is enhanced, because it does not have to filter out other colors.

No Japanese R & D red LED rare elements

Tokyo Institutet of Technology and Kyoto University jointly announced has developed without the use of expensive rare elements of red light emitting semiconductor.

Researchers are turning to the use of rich earth elements as an alternative, such as the use of nitrogen and zinc as the standard component screening method. Low cost materials can reduce the red LED and solar cell production cost.

Hybrid nano crystal LED inhibition efficiency decreased

Researchers at the Nanjing University have discovered a new application of hybrid nano crystal, can be used for filling InGaN or GaN LED structural holes, to significantly improve the luminous efficiency of white LED.

The study was published in the "Applied Physics Letters", points out that improving the color conversion efficiency (CCE) is the key to the effective non radiative resonance energy transfer decision, rather than with the blue InGaN/GaN LED, or down conversion material (such as phosphorus or even semiconductor nanocrystals).

UV LED free surface light distribution technology

The important progress made in the application of Chinese Academy of Sciences Chongqing Green Intelligent Technology Research Institute for integrated optoelectronic technology research center in the ultraviolet LED free surface light distribution technology, the success of LED ultraviolet light source for exposure machine, products have been in the PCB, LCD panel, touch screen industry was used. The traditional parallel light exposure machine using high pressure mercury lamp as the light source, the life of only 1000 hours, high power consumption, and pollution. Using UVLED to replace the mercury lamp, mercury lamp life of up to 50 times, the power consumption can be reduced by 90%, greatly reduce the production cost, no environmental pollution.

At present, the Chongqing academy has breakthrough the key technology of LED multi precision optical free-form surface, suitable for ultraviolet inorganic optical element processing, first developed a parallel light ultraviolet exposure head based on LED, the parallel angle can be controlled within about 2 degrees, lighting uniformity is less than 3%, lighting intensity reached 40mW/cm2.

The new breakthrough of LED heat radiating device

China light industry association senior engineer Li Kuanan introduced a kind of independent intellectual property rights innovation LED cooling technology. These companies can successfully eliminate all obstacles, and the use of wire forms and methods of cooling fan, and obtain a good cooling effect. Inventor Zhang Yixing pointed out that the design solves the problem of radiation, to meet the "high efficiency, high reliability and low cost" LED drive power demand, and fundamentally solve the two major problems in the development of LED.

New materials for white LED provide longer life

Professor Xiang Weidong School of chemical and material engineering Wenzhou University invented innovative materials, the LED lamp and prolongs the service life of nearly 10 years. Long time lighting makes this material can be widely used in luxury cars, aircraft, high-speed rail, subway and other lighting applications.

Weidong spent many years in a high temperature of 2000 DEG C under single LED chip synthesis on the Yellow light. If the 24W light source a blue LED chip with a 5.5mm * 5.5mm pairing on a single chip, yellow light crystal can stably emit white light. Because the chip thermal resistance, high conductivity, elastic LED lamps will be bigger, longer life. LED lighting is not easy to be damaged in high temperature and long time lighting, very suitable for luxury cars, car lights, high-speed rail, aircraft and submarine