Also checks how they can be us in practice. Finally, the fourth group of scientists bas on organic compounds makes devices: for example, transistors (OFET) and organic light emitting diodes (OL) without heavy metals in the composition and with a luminous efficiency of 100%. As a result, out of hundrs of initially model compounds, only a few become emitters. Ls of three generations The Novosibirsk laboratory produces Ls of the third generation. They have a glow efficiency of 100% (unlike the first generation, 25%) and do not contain heavy metals (unlike the second generation, which is characteriz by the use of iridium.
Where the glow efficiency reaches barely
The main elements in the structure of semiconductors in such Sweden Phone Numbers List a diode are sulfur, nitrogen, oxygen, hydrogen and carbon, that is, exclusively organic compounds, due to which the third generation has a number of advantages: Cheapness . Iridium and other useful heavy metals are min mainly abroad. In addition, the world’s reserves of, large-scale use of organic light emitting diodes. And sulfur, carbon, oxygen, hydrogen and nitrogen can be obtain literally from natural sources, available in unlimit quantities. Environmental friendliness . Heavy metals are harmful to living organisms. But some of the synthetic blocks us to assemble the final organic emitter molecules can be isolat from natural raw materials.
These metals are not large enough for widespread
Resource intensity To deposit silicon on the diode USA CFO substrate, physical and chemical evaporation-spraying methods are us. And for organic compounds – solution methods. That is, after evaporation of the solvent from the solution with the emitter, the resulting layer is immiately ready for use. It is technologically simpler, faster and cheaper. Physical flexibility . The silicon wafer breaks easily when you try to bend it. But a sensor made of organic molecules in the form of a thin film easily takes the form of a substrate (for example, a finger). such an efficient extraction.