Innovation in the field of LED technology continues to attract black technology [Full text]

The dynamic innovation of science and technology is almost a household word in the business world. In the West, more than 60% of the Standard & Poor's 500 companies have incorporated "innovation" into their corporate mission and deliberately used the word "innovation" when marketing or branding. The same innovation is also an important "vital power" for the development of the LED display industry.

As an epoch-making new source light source, LED has the advantage that many traditional light sources cannot match, and it also brings infinite possibilities for the lighting age. With the rapid development of LED technology, LED is constantly being applied in new fields.

U.S. Develops Monolithic Integrated Tri-Color LED Future Will Contain More Color Combinations

Based on indium gallium nitride technology and existing manufacturing facilities, strain engineering can provide a viable method for microdisplays.

Based on the strain engineering of indium gallium nitride (InGaN) multiple quantum wells, the University of Michigan has developed a monolithically integrated amber-green-blue LED. The strain engineering is achieved by etching nano-pillars of different diameters.

The researchers hope that in the future, red-green-blue LEDs can be produced using 635 nm photoluminescence quantum wells, providing a feasible method for microdisplays based on such pixel LEDs. Other potential applications include lighting, biosensors, and optogenetics.

In addition to the support of the National Science Foundation (NSF), Samsung also provided support for manufacturing and equipment design. Researchers hope to develop chip-level multicolor LED platforms based on existing manufacturing infrastructure.

Scientific researchers successfully developed ultra-pure green LED for the first time

Researchers at the Chemical Engineering Laboratory of the Federal Institute of Technology in Zurich recently invented an ultra-thin, flexible light-emitting diode (LED) that emits ultra-pure green light. The researchers used this fine tone to display the three letters “ETH”. ". Professor Chih-Jen Shih, head of the research team, was very satisfied with his research breakthrough: “So far, no one has succeeded in producing a pure green light like ours.”

Professor Shih pointed out that the study will help the next generation of ultra-high resolution displays for TVs and smartphones. Electronic device screens must be able to produce ultra-pure red, blue, and green lights so that the monitor can produce clearer, richer details and finer color range-adjusted images. Previous technical research has been able to achieve the purity of red and blue light production, but solid-color green light seems to encounter a technical bottleneck, it is difficult to achieve technical breakthroughs, mainly due to visual constraints. Compared with red and blue light, it is difficult for the naked eye to discern the change of green hue, which makes ultra-pure green very complicated in technical production.

Prof. Shih also pointed out that they have developed an ultra-thin, flexible LED that can be used simply to emit pure green light at room temperature. He said: “Because our LED technology process does not require high temperatures, this opens up opportunities for simple, low-cost industrial production of ultra-pure green LEDs in the future.” The research team used perovskite as a semiconductor crystal for LED radiation. The thickness of the perovskite material in the LED is less than 4.8 nm. The LED material can be bent as a paper-like image, so it can achieve rapid roll-to-roll process, which not only improves production efficiency, but also reduces production costs. However, this ultra-pure green LED still needs some time before it is put into industrial applications.

LED brings great changes to the optical microscope industry

In the microscope, the light source that has been used for a long time is the quartz-halogen incandescent lamp. At present, the LED is entering the microscope because the halogen source usually dissipates 50W-100W. However, it can be seen that halogen sources are still very advantageous, and they are essentially black body radiators.

This means that they produce a continuous spectrum of light, without any bulges, so any object of any visible color can be seen, and any visible color can be separated by optical filtering.

"The benefit of halogen is that it is a good broad-spectrum light source. The spectrum is very uniform and the colors are very good," said Clive Beech, component manager at British LED manufacturer Plessey.

The first problem with halogens is to protect the sample from heat. Beech said: "It has a high load of infrared, which is harmful to any tissue sample or organic material, so you have to filter it out."

LEDs avoid this layer of filtering because the standard blue-plus-phosphor technology does not produce IR. Plessey optical designer Samir Mezouari said, "Most [LED companies] can simulate the blackbody emission spectrum. But the challenge is how to get the best performance."

Lighting new results! New carbon nanotube yarn stretches to light LED

In simple terms, you take a piece of yarn and stretch it to produce electricity. Sew them into the coat, no external power supply, people can breathe normally to generate electrical signals. Dr. Carter Haynes, of the Nano Research Institute at the University of Texas at Dallas, said in an interview with a Sino-foreign cooperation research published in the journal Science recently.

This yarn, called Twistron, is spun from many carbon nanotubes. The diameter of a single carbon nanotube is 10,000 times smaller than the diameter of a human hair. In order to make the yarn highly elastic, the researchers continuously improve the twist, making it a spring-like structure.

"These yarns are essentially supercapacitors, but they don't need an external power source to charge them," said Dr. Li Na of Nano Research Institute. Because the chemical potential of the carbon nanotubes and the electrolyte is different, when the yarn is immersed in the electrolyte, a portion of the charge is embedded therein. When the yarn is stretched, the volume is reduced, the charges are brought closer to each other, the voltage generated by the charge is increased, and electrical energy is obtained.

“When stretched at a rate of 30 times per second, the yarn produces 250 watts per kilogram of peak electrical power. A yarn weighing less than the fly can light up one LED each time it is stretched.” Nano Research According to Dr. Ray Bowman, director of the Institute and author of the article, the electric power per unit weight of the Twistron yarn can be increased by more than 100 times compared to other woven fabrics.

Currently, the most suitable application for carbon nanotube yarns is to power sensors or IoT communications. "Based on the average output power we achieved, only 31 milligrams of yarn can be used to transmit 2 kilobytes of packets every 10 seconds for the IoT in a radius of 100 meters."

The original title was terrible word LED! A lot of innovative applications come out