Philipp Stoessel

22.2: Novel Triplet Host Materials: High Performance Made Easy

Novel materials are the key to high performance phosphorescent devices. New host materials show significant advantages over the currently used class of carbazole based materials. A significantly simpler device structure can be used applying the new material classes. Compared to the classical triplet device structure (employing electron transport layers and hole-blocking layers) an even better EL performance in terms of efficiency and lifetime is observed.

17.5L: Late-News Paper: Novel Host Materials for Efficient and Stable Phosphorescent OLED Devices

A new class of matrix materials for phosphorescent OLEDs has been developed. Those materials show significant advantages over the currently used class of carbazole based materials. Device lifetime could be prolonged by a factor of 6 while significantly improving power efficiencies.

Developments in polymer materials for electroluminescence

In the last few years industrial research into materials fulfilling the needs of the fledgling OLED display industry have intensified considerably. At Covion we have developed a range of polymers based on phenyl-PPV derivatives which are now being commercially exploited in the first polymer LED applications. These materials have been developed systematically with the demanding requirements of the devices (e.g., high efficiency and lifetime) and the industrial applicability (e.g. processibility, reproducibility and reliability of supply) in mind. However due to market forces, such as the introduction of 3rd generation mobile communication technology, there will be an immediate demand for materials for full color OLED displays. In this paper we will report on progress in the development of Red, Green and Blue (RGB) materials at Covion. The requirements for the different colors vary depending on band gap (amongst others) and therefore the challenges for each color are different. The experience gained in understanding the important structure-property relationships in the phenyl-PPVs has been used to develop these new RGB materials.