Thermally activated delayed fluorescence – as a solution to the low yield problem of the fluorescent OLEDs

Piotr PANDER* – Department of Physical Chemistry and Technology of Polymers, Faculty of Chemistry, Silesian University of Technology, Gliwice, Poland
Please cite as: CHEMIK 2016, 70, 6, 318–325

The development of display technologies has begun with the invention of the cinematograph; whereas a next important step was the cathode ray tube. CRT screens reached a high degree of development at the turn of the century, but they have been virtually superseded today by the liquid crystal displays (LCD). Another important step was made when organic LED screens (OLEDs) were introduced, in which only selected pixels are illuminated. The commercial OLED screens are already in production, and interest in the development of this technology is observed by leading electronic companies [1]. It should also be noted that OLED devices can be also successfully used for lighting purposes. [1÷6]

There are two approaches in design of OLEDs: devices based on small molecules, so-called SMOLED (Small Molecule Organic Light-Emitting Diode) or based on polymers, so-called PLED (Polymer Light-Emitting Diode) [3, 4, 7, 8]. Conjugated polymers are commonly employed as emitters in polymer LEDs [9, 10]. Decades ago the effects of light on conducting polymers was studied [11, 12], also then the first SMOLED was produced [13]. Since that times an incredible development of organic electronics has been achieved [4, 7]. However, in this article only those solutions that use small molecules will be described.

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