Lower cost and higher brightness, the United States researchers prepared LED perovskite

[LED] China network research team from the Florida State University developed a new type of light emitting diode (LED), using an organic inorganic hybrid material, this material can be made cheaper, more light and display.

Assistant professor of physics Hanwei Gao (transliteration: Gao Hanwei) and associate professor of chemical engineering Biwu Ma (transliteration: Ma Biwu) is using a class of materials called organic metal halide perovskite materials to produce a high-performance LED. They published their findings in the journal advanced materials.

Left: Gao Hanwei; right: Ma Biwu

"Earlier work found that perovskite could be a promising material for making LED," Gao Hanwei said. "But its performance has not yet reached its full potential. We think there is room for improvement. "

In the past, other researchers have tried to make LED with perovskite, but none of them is particularly efficient. Gao Hanwei and Ma Biwu believe that if the formula is adjusted, the organic-inorganic mixture can make LED better performance.

"When we think about this stuff, we know it's going to be better," said Ma Biwu. We propose a new method to solve some of the key issues, thus creating a high-performance LED. "

After a few months of experiments in the control of the structure of the device by performing a fine tuning of the material properties and equipment engineering through synthetic chemistry, they eventually produced a higher performance than expected LED. The material is particularly dazzling.

After the measurement, under the driving voltage of 12V, the luminescence intensity of about 10000 candelas per square meter. Generally speaking, on the computer screen, the luminescence intensity of about 400 candelas per square meter LED is bright enough.

"This extraordinary brightness is largely determined by the high luminous efficiency inherent in this surface treatment, highly crystalline nanomaterials," said Gao Hanwei.

The production of this material is fast and simple. In the lab, Gao Hanwei and Ma were able to make the material in about an hour, about half a day to create a complete device and test it.

In addition, although the bare mixed perovskite is unstable in the humid air, the perovskite structure has good stability because of its specially designed surface chemistry. Such chemical stability greatly reduces the need for the production of this new LED facility, which is of great benefit to the future of high cost production.

This research is crucial to the advancement of LED technology, which is rapidly becoming a channel for reducing power consumption. Although the market has a variety of LED lighting products for sale, but because of the cost of materials and quality related issues led to the slow popularity of LED lighting.

However, the LED lamp is an indisputable fact that energy conservation. According to the U.S. Department of energy, residential LED lighting than ordinary incandescent at least 75%.

"If you can make a low-cost, high-performance LED, everyone will choose it," said Ma Biwu. "For the industry, our approach has a great advantage, because it can be very economical way of processing the earth's rich materials can be made of this material. "

They work also includes a focus on LED technology research assistant professor of industrial and manufacturing engineering Zhibin Yu (transliteration: Yu Zhibin, assistant professor of Chemistry) and Kenneth Hanson (Kenneth Hansen), he was co-author of the paper.

"High hanvit and Ma Biwu, and Kenneth Hansen are 11 new faculty members employ energy and raw materials strategic recruitment plan," Vice President W. Ross Ellington said the research associate. "The current work, as well as other recent joint publications, suggest that synergy is expected to be achieved through efforts".

In addition to Gao Hanwei and Ma Biwu, the other researchers at the Florida State University also includes Hanson, a postdoctoral research associate Yichuan Ling (transliteration: Ling a) and Zhao Yuan (transliteration: Yuan Zhao), and graduate student Yu Tian (transliteration: Tian Yu), Xi Wang (transliteration: Wang Xi) and Jamie C. Wang. (compile: China LED network /Nicole)

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