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8:44 PM  July 31, 2019

TSU physicists created blue diodes on organics for smartphone displays

© предоставлено пресс-службой ТГУTSU physicists created blue diodes on organics for smartphone displays

TOMSK, Jul 31 – RIA Tomsk. Scientists of Tomsk State University (TSU) developed a technology for the production of blue diodes based on organic molecules, which are necessary for creating displays for phones, televisions and tablets, the press service of the university said on Wednesday.

It is specified that TSU physicists were the first in Russia to solve the problem of creating blue organic light-emitting diodes (OLED – organic light-emitting diode). OLED technology is much cheaper and more economical than LCD (liquid crystal) technology. In addition, these LEDs are easy to dispose of. The project was implemented with the support of a grant of the Russian Science Foundation (RSF).

"They are necessary to create displays for phones, televisions, tablets and other devices based on cheap materials – hetero[8]circulenes. Blue diodes on organics remain the last technically complex "link" for the RGB structure (red, green, blue)", – is said in the statement.

According to TSU scientists, the technology of creating red and green OLEDs is almost perfected, and the creation of blue OLEDs for RGB layers is still an urgent task. Here it is necessary to search for stable substances that shine effectively in the blue range at low voltages. TSU physicists proposed to use organic molecules of circulenes, which are highly stable and have good luminescent characteristics.

"In 2016 we predicted the luminescent properties of circulenes using quantum chemistry methods. Later, our colleagues from University of Copenhagen were able to synthesize them. This year we were able to create OLEDs in Tomsk. First, white OLEDs were made on them, because it was difficult to create blue ones. But we solved the technical problem by removing the excimer radiation", – the associate professor of TSU Rashid Valiyev is quoted in the message.

White OLEDs are used in the manufacture of luminaires: with low power supply, they are highly efficient. In the future, scientists are planning to improve the technology of production of blue OLED on circulenes for flexible displays. According to the university, OLED technology has recently captured the consumer electronics market, including phones, televisions and laptops. TSU has been engaged in the OLED technology since 2013.

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