Chemists have created a new class of phosphors for the electronics industry

© Depositphotos / alexraths Scientists in the laboratoryChemists have created a new class of phosphors for the electronics industry© Depositphotos / alexraths

An international team of chemists from China, Russia and Japan have synthesized a new crystalline material based on oxides of rare earth metals, as well as describe its structure and properties. Transcript radiographs new connection is established that he belongs to a new, previously unknown class. It is also established that the compound has properties that make it suitable for use in the electronics industry (e.g., monitors). The study is published in the prestigious British scientific journal «Chemistry – A European Journal».

A team of researchers from Bohai University (China), northeast University in Shenyang (China) and National Institute for Materials science (Japan), combining the nitrates of rare earth elements from sulfate and ammonium hydrates, synthesized a new powdered substance, with luminosity (the ability to convert electric energy into light). Fluorescent (luminosity) is widespread among the compounds of rare earth elements, and this would not be surprising, but the spectrum of the new compound was completely unique, unlike any of the known or anticipated. Comparison of radiographs with databases showed that the connection does not belong to any known classes.

To determine the crystalline structure of matter (descriptions from the atoms of which chemical elements composed of crystal and how the atoms in this crystal are located relative to each other) Sino-Japanese team brought to the Russian colleagues.

The employee of the Siberian Federal University and Institute of physics. L. V. Kirenskogo, FITS KSC SB RAS Maxim Molokeev solved the problem, confirming that the connection really refers to a previously unknown class.

«The main difficulty was that that was not possible to obtain a single crystal of the new compound, therefore, it was impossible to conduct a study on standard single crystal x-ray methods of structure determination. For powders this task much more difficult,» – said Maxim Molokeev.

Deciphering the powder x-ray Maxim Molokeev found that the new material consists of tetrahedra (chetyrehkantnomu) complex anions of sulfur dioxide (SO₄2−) and ions of rare earth elements, surrounded by oxygen atoms. Chetyrehkantnye of sulfur dioxide are not ordered.

The most striking feature of the new compounds was the fact that when heated to 800℃ is environmentally friendly synthesis of phosphors suitable for use in the electronics industry (production of light-emitting devices, e.g., monitors). It is noteworthy that in the synthesis of secreted exclusively normal water, while when obtaining other such phosphors usually releases toxic by-products.