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New compounds for cheaper, tunable OLEDs

Posted: 27 Oct 2014 ?? ?Print Version ?Bookmark and Share

Keywords:tunable? OLED? compounds? Spain?

New organic compounds will soon pave the way for a cheaper manufacturing of tunable OLED devices. Researchers from the Organometallic Chemistry and Homogeneous Catalysis, and Photovoltaic and Optoelectronic Devices at Spain's Universitat Jaume I, developed the modular, stable and efficient compounds.

The two groups recently started a proof-of-concept project to verify that these compounds have the photoluminescent and electrochemical properties needed to produce tunable OLEDs that can emit in the blue portion of the visible spectrum, thus applying lower voltages and achieving a greater efficiency and a longer lifetime.(In related news: Physicists create polymer with tunable colours for white OLED)

The prepared compounds have tunable electronic and physical characteristics in which small changes in the original structure would make it possible to tune the photophysical properties of the final compound. The compounds allow the manufacture of solution-processable OLEDs with a cheap, scalable and more convenient method for industrial purposes. The devices are soluble in non-toxic solvents, and the structure of their molecules allows electronic connectivity between the two ends and the adjustment of the properties of electronic transport, thus improving the efficiency of the device.

Tunable OLEDs

Macarena Poyatos and Antonio Guerrero (Source: Universitat Jaume I)

During the research conducted by Macarena Poyatos and Antonio Guerrero, two families of pyrene-based nitrogen-donor compounds have been developed, given that pyrene is the chromophore of choice in fundamental and applied photochemical research. The synthesis of these compounds involves four steps at the most, which results in the generation of lower amounts of waste and the minimisation of the use of auxiliary reagents and solvents.

The family of neutral pyrene-based organic compounds can be prepared on a large scale and have proved to be stable. The compounds show strong emission in the blue portion of the electronic spectra and high quantum yields. The second family of compounds have been prepared starting out with the above mentioned neutral compounds, and they are also based on pyrene. The family of nitrogenous organic salts is highly robust, shows strong emission in the blue portion of the electronic spectra and offers moderate quantum yields.

Once they are implemented in OLED devices, the developed and patented compounds will form part of the light-emitting layer together with what is known as host. The so-called host, if used in isolation, would not produce visible light; but when adding an emitter to it (an organic or an organometallic compound), the emission occurs in the visible part of the spectrum. Since this technology allows the OLEDs to work at low voltages, the device is under less electronic strain and therefore exhibits longer emission lifetimes.

Researchers are seeking a manufacturer of OLED devices interested in the production and the commercialisation of such devices based on the compounds developed by the two research groups.

(Source: Universitat Jaume I)

- Paul Buckley
??EE Times Europe

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