Brighter and cheaper LEDs could be made from perovskite b4in.org/f6uZ Researchers at University of Cambridge, University of Oxford, and Ludwig-Maximilians-Universität are performing research on perovskite-based devices that work the other way around by emitting light. Their research has turned out promising results that suggest high-brightness LEDs, manufactured at low cost and more easily, can be harnessed using perovskite. High power LEDs of the future “Perovskite” is a general term used to describe a group of materials that have a distinctive crystal structure of cuboid and diamond shapes. Their efficiency at converting light into electrical energy has opened up a wide range of potential applications. The perovskites that were used to make the LEDs are known as organometal halide perovskites, and contain a mixture of lead, carbon-based ions, and halogen ions known as halides. These materials dissolve well in common solvents, and assemble to form perovskite crystals when dried, making them cheap and simple to make. “These organometal halide perovskites are remarkable semiconductors,” said Zhi-Kuang Tan, a PhD student at the University of Cambridge’s Cavendish Laboratory and the paper’s lead author. “We have designed the diode structure to confine electrical charges into a very thin layer of the perovskite, which sets up conditions for the electron-hole capture process to produce light emission.” More b4in.org/f6uZ
Posted on: Thu, 14 Aug 2014 22:46:44 +0000
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