Russian and South Korean scientists have created a new type of light-emitting element for displays. They use two-dimensional semiconductors and metasurfaces. These elements shine 1600 times brighter than conventional semiconductor layers. At the same time, they are more durable and thinner than analogs that have the same brightness. This was reported by the press service of ITMO University.
The new type of element has a crystalline structure, and therefore can withstand the effects of light and electricity. Physicists suggest that such an element will have practically no "expiration date", while the service life of organic light-emitting elements is limited to several years.
A group of South Korean and Russian scientists, led by Vasily Kravtsov, a leading researcher at the New Physics and Technology Department of ITMO University in St. Petersburg, has created a new type of light-emitting element. The invention is based on thin films of molybdenum diselenide, a two-dimensional semiconductor material with special properties. A metasurface made of gold is also used.
Metasurfaces, according to physicists, are artificial structures made of nanoparticles or small elements that can interact in a special way with light and other waves. Russian scientists have created a system of slits in a thin gold film. These slits cause two types of collective electron oscillations. The oscillations amplify each other and increase the radiation generated by the two-dimensional semiconductor.
Scientists have made significant progress in creating LEDs. They increased the luminescence of a layer of molybdenum diselenide by 1,600 times. At the same time, the thickness of the entire structure was reduced to 30 nanometers, which is only a few hundred times thinner than a human hair.
Such LEDs will become the basis for bright and durable displays. They can be used in quantum communications. They are also suitable for storing information and solving other physical problems.
We want to increase the number of semiconductor layers and assemble a heterostructure. Such light-emitting elements have an increased lifetime of excited states and have new degrees of freedom in which optical states can be stored. Potentially, this will allow the creation of ultra-compact devices for simultaneous detection, processing and transmission of optical information.
Earlier, scientists from Perm Polytechnic University created a mathematical model that significantly improves the recognition of touches on acoustic touch screens. The technology allows you to determine the coordinates of the touch with an accuracy of 0.1 millimeters, even when exposed to vibrations, moisture, dust or mechanical damage.
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