New perovskite LED emits circularly polarized light

A group of physicists and chemists have developed a new type of LED that uses spintronics without the need for magnetic fields, magnetic materials or low temperatures. A huge leap can take the display to a new level.

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Vary Vardeny, professor of physics and astronomy at the University of Utah, said: “Companies that make LEDs or TVs and computer monitors don’t want to deal with magnetic fields and magnetic materials. This is heavy and expensive.” “Here, chirality. The molecules are self-assembled into a standing array like soldiers. They actively rotate and polarize the injected electrons, resulting in circularly polarized light emission. There is no magnetic field, no expensive ferromagnets, or extremely low temperatures. Those are right. It’s a taboo in this industry."

Most optoelectronic devices (such as LEDs) only control charge and light, not the spin of electrons. Electrons have tiny magnetic fields, just like the earth, with magnetic poles on opposite sides. Its spin can be seen as the direction of the pole, and binary information can be assigned-"up" spin is "1" and "down" spin is "0". In contrast, conventional electronic devices only transmit information along wires through electronic pulses, conveying messages in "1s" and "0s". However, spintronics devices can use these two methods at the same time, which is expected to process exponentially more information than traditional electronic devices.

One obstacle to commercial spintronics is setting the electron spin. Currently,Researchers at the University of Utah and the National Renewable Energy Laboratory (NREL) have developed a technology that can be used as a spin filter that consists of two layers called chiral two-dimensional metal halide calcium Made of titanium ore material. The first layer prevents electrons from spinning in the wrong direction. This layer is called a chiral induction spin filter by the author. Then, when the remaining electrons pass through the second luminescent perovskite layer, they cause the layer to produce photons that move in unison along a spiral path instead of the traditional wave pattern, resulting in circularly polarized electroluminescence.