For the first time ever, researchers at the Siemens subsidiary Osram Opto Semiconductors were able to successfully produce gallium nitride LED chips on a silicon substrate instead of the much more expensive sapphire backing.
Silicon is a standard material in the semiconductor industry and is therefore an inexpensive and easily obtainable alternative. This development goes a long way toward making it possible for Osram to produce LED components at a much lower cost while maintaining the same level of quality and performance.
LEDs are an efficient and, above all, energy-conserving alternative to traditional types of room lighting. However, until now the manufacturing costs for LEDs have been higher than those of other more established types of lighting, so they have not been widely adopted for everyday use.
Using this new procedure, it should be possible to use large sheets of silicon for LED production, which would result in a major improvement of manufacturing efficiency. Osram has already succeeded in producing high-performance LED chips on a 150-millimeter (six-inch) wafer. Theoretically, one such wafer would be sufficient to produce 17,000 LED chips of one square millimeter each.
Researchers are already working on the adjustment of the production process to handle eight-inch wafers. This would increase the number of chips per substrate, thereby further reducing the cost of production. The first commercially available LED products using silicon-based chips are expected to be on the market in about two years.
These new thin-film-based LEDs are still only at the pilot stage and will have to be tested under real-world conditions. The blue and white silicon-based prototypes display performance characteristics that are on a par with the LEDs available on the market today. A blue chip measuring one square millimeter in a standard housing delivers a record brightness of 634 milliwatts at 3.15 volts. That's an efficiency rate of 58 percent. Those are excellent results for a chip of that size at a current of 350 milliamperes.
The development of these new manufacturing technologies is based on the specialized knowledge regarding the growth of artificial crystals that has been gathered by the researchers at Osram Opto Semiconductors.
The major breakthrough was a special epitaxy process which made it possible to slice off particularly stable silicon films without the cracking that has often been a problem in the past. At the same time, these silicon films are also comparable to sapphire backing with regard to the LEDs' brightness and stability.
Dr. Norbert Aschenbrenner | Siemens InnovationNews
'Super yeast' has the power to improve economics of biofuels
18.10.2016 | University of Wisconsin-Madison
Engineers reveal fabrication process for revolutionary transparent sensors
14.10.2016 | University of Wisconsin-Madison
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.
In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...
'Ferroelectric' materials can switch between different states of electrical polarization in response to an external electric field. This flexibility means they show promise for many applications, for example in electronic devices and computer memory. Current ferroelectric materials are highly valued for their thermal and chemical stability and rapid electro-mechanical responses, but creating a material that is scalable down to the tiny sizes needed for technologies like silicon-based semiconductors (Si-based CMOS) has proven challenging.
Now, Hiroshi Funakubo and co-workers at the Tokyo Institute of Technology, in collaboration with researchers across Japan, have conducted experiments to...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
21.10.2016 | Health and Medicine
21.10.2016 | Information Technology
21.10.2016 | Materials Sciences