Researchers at Rensselaer Polytechnic Institute announced their light-emitting diode (LED) on research progress, can greatly enhance the LED lighting performance and energy efficiency.

They co-developed with Samsung Electro-polarization matching LED, the light output increased by 20%, while the parameters of conversion efficiency LED characterization, electro-optical conversion efficiency increased by 25%. LED traditional GaInN / GaN active region, and a new polarization matched GaInN / GaInN active region of the energy band diagram.

The new device significantly reduces the “effective settlement” phenomenon, but the phenomenon is the efficiency of LED devices are a major limiting factor. As we all know, when the low-density current flows through the LED, its highest efficiency. However, some applications, such as higher brightness of light bulbs need to use high-power devices, the efficiency of this LED will be lost. Although the efficiency of the principle of the settlement have not yet fully clear, but studies have demonstrated that a large proportion of leakage from the electron.

“Over the past two years, the issue gained widespread attention the research community; is the application of solid-state lighting technology major obstacle,” the research project director Fred Schubert introduced, who is also a professor at Rensselaer, and the School National Science Foundation (NSF) Engineering Research Center funded intelligent light director.

“We track the electrons from the light of the active region escape the process. In the active region, we hope to keep the hole in E, so you can reorganize and light; However, if the carrier left the active area, obviously will not be re-occur again. We think this is the source of the efficiency of settlement: one carrier left the active zone; This form of active area leakage. ”
As the current high brightness LED are working in more than peak efficiency of high current density range, so the phenomenon is widespread. Natural idea is to reduce the operating current density to the peak efficiency region, but its brightness can not accept, so this problem has become a huge obstacle LED applications.

Other researchers have tried to e-blocking layer, but the result was not perfect. PRI’s team?? By the academics, industry partners and students?? Are using the concept of polarization match. They use the four-polarity active region material, with four polar and three polar compound materials, with different ways to reduce the polarity of each method have been positive results.

The new LED has a new design of the polarity – matching active region, allowing the device at high current density region was peak efficiency. They studied the LED light generated in active region, the researchers found, which polarity mismatch with the material, it is likely that e-disclosure, that is, reasons of low efficiency. More research shows that by using different quantum barriers designed to greatly reduce the polarity mismatch. Conventional GaInN / GaInN to replace the LED active region of the GaInN / GaN layers. Get more matching polarity, reducing leakage and efficiency of electronic settlement.

“Nitride is a special class of semiconductors, and silicon and gallium arsenide different,” Schubert said. “GaN has a high internal electric field, this is trouble. Our match with just a long polar c plane sapphire substrates in such active areas can greatly reduce the electric field. A result, inhibit the efficiency of settlement , light output power increased by about 20%, electro-optical conversion efficiency of about 25%. for the LED industry, this is a very surprising number. In order to improve the efficiency of 5%, the industry is willing to do any work; 20% very great improvement.

Schubert noted that the reason for the efficiency of a single settlement, academia has not yet been agreed. “The next step is to identify the reasons behind the physical and comprehensive lifting of the efficiency caused by reason of settlement, detailed understanding of all aspects.” The team will continue to explore possibilities to further improve the device’s other possible LED structure. According to Schubert Introduction, LED can also achieve other additional features, for example, to change the luminescent properties, similar to sunlight, the color and temperature, it can get more natural full spectrum lighting.

“We can modulation spectrum,” he said. “This can be natural, can adjust the light source, and can be used to process the data. This is one of our goals: to generate light and to deal with the dual function of the data. Imagine the airport terminal’s lights, road traffic signals , in addition to lighting function, but also can be used to communication; building where the light source can with the room number and information to track objects within the building. intelligent light source can achieve all this.

This is our long-term goal. “Schubert expect , and health care, transportation systems, digital display and computer networks, and solid-state lighting based on LED illumination device can set off a new environmental, energy saving and low-cost wave.

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