Electroluminescence emission of light under the influence of an external electric field are widely used in electronics, for example, in the manufacture of LCDs. Scientists continue to investigate the materials suitable for electroluminescence. Promising group of substances — is combining the elements of II and IV of the periodic system.
Light emission occurs in the contact zone of two different semiconductors. Today, for the manufacture of luminescent panels use thin-film technology. In this part of the semiconductor film introduced a small amount of impurities — other semiconductor. Researchers from the Physico-Technical Institute of the Ural Branch of the Russian Academy of Sciences, Udmurt State University and Moscow State University. University offered a different technological solution.
As the semiconductor nanocrystals are used conductive zinc selenide (ZnSe), already in the preparation enclosed in an amorphous matrix of the same composition. This combination has helped to avoid the standard procedure of doping conductive film. The work program supported by the Presidium of Russian Academy of Sciences, an innovative project of young scientists RAS, a grant from the President of the Russian Federation and the contract with the FASI (Ministry of Education), published in the "Journal of Technical Physics."
Richat VALEEV and his colleagues received the film amorphous-crystalline zinc selenide by explosive powder evaporation in a vacuum. Prototyping scientists electroluminescent emitter applied to the substrate alloy of indium tin oxide which is a good conductor of electric current. Was deposited on top of it working layer of zinc selenide. In order to prevent breakdowns of the working layer on both sides also covered by dielectric layers limiting the current.
Conducted by means of electrochemistry and spectroscopy studies confirmed the presence of the electroluminescent properties of the resulting structures. The maximum intensity of the glow of the new emitter is at the wavelength 335 nm is observed when an external voltage 270 V with a frequency of 220 Hz.
Number of contacts semiconductors depends on the size of the nanocrystalline particles. Researchers note that resizing ZnSe nanoparticles range from 5 to 100 nm can regulate the intensity of the radiation.