GaN-on-silicon LEDs. Free Technical Library News

NEWS OF SCIENCE AND TECHNOLOGY, NOVELTY IN ELECTRONICS
Free technical library / timeline

GaN-on-silicon LEDs

19.04.2013

Plessey Semiconductors produced its first gallium nitride-on-silicon LED at its Plymouth factory.

As the company's chief engineer, Barry Dennington, said, "We can offer entry-level product samples and are already discussing other products." "Product batches can be ordered now, with a typical lead time of 6 weeks," Dennington said. "Basically, we are about 80% cheaper than silicon carbide LEDs," he added, saying that the cost of both the package and the die is about half the cost of the finished device in these small packages.

Before launching lighting LEDs, Plessey launched indicator LEDs, where price is more important than efficiency. The LEDs emit 2 lm at 20 mA in a 2 x 3,5 mm PLCC-2,7 package. The LEDs are made on 150 mm silicon wafers. Unlike the smaller and more expensive sapphire or silicon carbide LEDs used primarily for white, blue and green LEDs, "they are very cheap," Dennington said, without stating their selling price.

A family of four or five of these low-power devices will be available "in a month or two," said Chief Technology Officer Dr. Keith Strickland. What type are these devices? Plessey doesn't give answers. "Planning one for 4 lumens," was all Strickland could say. "When we reach 60 lm/W, we will introduce our first lighting products," said Strickland. "We will reach 100 lm/W in the next 12 months." The first lighting LED, he stressed, will probably have a power of 1 watt.

Plessey entered the white LED market through the acquisition of CamGaN, a spin-off from the GaN-on-Silicon Center at the University of Cambridge. At the time of the acquisition, Plessey was talking about lighting LEDs.

The efficiency of signaling LEDs with 2 lm luminous flux is 32 lm/W, which is not much compared to lower category lighting LEDs from other companies. However, the company is doing the right thing, as this is the first gallium-on-silicon LED production of any company, and Plessey, never an LED manufacturer, went all the way to state-of-the-art manufacturing in 15 months.

Last May, Toshiba and Bridgelux announced plans for 200mm GaN-on-silicon wafer lighting LEDs, and announced 150mm wafer production late last year, though no production is yet to be seen.

<< Back: The northern hemisphere is facing the hottest summer in 600 years 20.04.2013

>> Forward: Asus Dual Screen Ultrabook Tablet 19.04.2013

Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

The threat of space debris to the Earth's magnetic field 01.05.2024

More and more often we hear about an increase in the amount of space debris surrounding our planet. However, it is not only active satellites and spacecraft that contribute to this problem, but also debris from old missions. The growing number of satellites launched by companies like SpaceX creates not only opportunities for the development of the Internet, but also serious threats to space security. Experts are now turning their attention to the potential implications for the Earth's magnetic field. Dr. Jonathan McDowell of the Harvard-Smithsonian Center for Astrophysics emphasizes that companies are rapidly deploying satellite constellations, and the number of satellites could grow to 100 in the next decade. The rapid development of these cosmic armadas of satellites can lead to contamination of the Earth's plasma environment with dangerous debris and a threat to the stability of the magnetosphere. Metal debris from used rockets can disrupt the ionosphere and magnetosphere. Both of these systems play a key role in protecting the atmosphere and maintaining ... >>

Solidification of bulk substances 30.04.2024

There are quite a few mysteries in the world of science, and one of them is the strange behavior of bulk materials. They may behave like a solid but suddenly turn into a flowing liquid. This phenomenon has attracted the attention of many researchers, and we may finally be getting closer to solving this mystery. Imagine sand in an hourglass. It usually flows freely, but in some cases its particles begin to get stuck, turning from a liquid to a solid. This transition has important implications for many areas, from drug production to construction. Researchers from the USA have attempted to describe this phenomenon and come closer to understanding it. In the study, the scientists conducted simulations in the laboratory using data from bags of polystyrene beads. They found that the vibrations within these sets had specific frequencies, meaning that only certain types of vibrations could travel through the material. Received ... >>

Random news from the Archive

Device to quickly stop bleeding 18.12.2015

Prompt cessation of bleeding in a gunshot wound is the most important factor in survival. According to the US Department of Defense Institute for Surgical Research, 30-40% of people with gunshot wounds die as a result of blood loss and 33-56% of them die before arriving at the hospital.

The XSTAT Rapid Hemostasis System technology, patented by the American company RevMedX, is used to stop bleeding within 15 seconds and is indispensable in areas of the body where it is physically impossible to apply a conventional tourniquet.

XSTAT 30 is a large syringe applicator with a diameter of 30 millimeters containing 92 compressed cellulose sponges in the form of a tablet coated with a special absorbent layer.

When injected into a wound, the sponges swell and fill the wound cavity, thereby creating a physical barrier to blood flow. The number of jaws used can vary depending on the diameter and depth of the bullet hole.

The XSTAT 30 applicator is able to absorb about 0,6 liters of blood and stop bleeding for up to 4 hours. To facilitate extraction of the sponges from the wound, each of them contains an X-shaped radiological marker that will be clearly visible on the x-ray.

The unusual device was approved by the FDA in April last year for use by the Pentagon during the fighting, now the new technology is available to civilians.

See full Archive of science and technology news, new electronics

All languages of this page

Home page | Library | Articles | Website map | Site Reviews