With the participation of the ZIOC, the development of OLEDs emitting in the near infrared region is underway
Organic Light Emitting Diodes (OLEDs) have been the subject of intensive scientific research in the past two decades due to their wide application in various fields of modern technology. However, most studies are limited to materials emitting in the visible region of the spectrum (400–700 nm), and luminophores emitting in the near infrared region have been studied very little. However, in night vision devices, analytical sensors and bioimaging devices, as well as wireless communication technologies, it is diodes that emit in the near infrared region that are used.
Researchers of the Laboratory of Polysulfur-Nitrogen Heterocycles of the Zelinsky Institute together with scientists from the Lebedev Physical Institute and the Mendeleev University created new infrared light sources based on compounds of the D-π-A-π-D type containing a pyridazinothiadiazole acceptor fragment. The devices have electroluminescence in the region of 700-850 nm. One of the resulting structures demonstrated optical power and external quantum efficiency close to the theoretical limit calculated for near-infrared fluorescent OLEDs based on small organic molecules with a small band gap. Based on the synthesized molecules, light-emitting devices were created that can be used in the manufacture of night vision devices and sensors. A relatively simple manufacturing technology for these diodes and inexpensive raw materials will allow in the future to create light sources in the form of flat panels of sufficient area with adjustable brightness.
Vladislav M. Korshunov, Timofey N. Chmovzh, Alexandra Ya. Freidzon, Mikhail E. Minyaev, Artem D. Barkanov, Ivan S. Golovanov, Lyudmila V. Mikhalchenko, Igor C. Avetisov, Ilya V.Taydakov, Oleg A. Rakitin Small D–π–A–π–D organic dyes for near-infrared emitting OLEDs with excellent external quantum efficiency // Dyes Pigm., 2022, 110860. DOI: 10.1016/j.dyepig.2022.110860.