Date
Place
- Room B (Room 324)
- 23. OLED Materials
- August 20, 2015 (Thursday)
- 09:00 ~ 10:10
- [23-4]
- 09:45 ~ 10:10
- Title:[Invited] Iridium-Free OLEDs Solutions for the Whole Color Spectrum
- Daniel?Volz and Thomas?Baumann (Cynora GmbH, Germany)
Abstract: In the last three years, great progress has been made on the field of iridium-free OLEDs. Extraordinary high device performance by using thermally activated delayed fluorescence (TADF) ? or singlet harvesting ? instead of phosphorescence has been demonstrated with devices exhibiting more than 20% external quantum efficiency. This puts both organic and copper-containing emitters on eye level with modern iridium materials in terms of efficiency. We recently presented TADF solutions to cover the whole color spectrum, from deep blue to red. The new TADF materials are suitable for both vacuum processing and solution processing techniques such as inkjet printing. Especially the realization of deep-blue emitters using the singlet-harvesting approach is of interest. Due to direct emission from the S1-state, the generation of UV-photons, a known problem of phosphorescent emitters, can be avoided. Without using outcoupling-enhancement techno-logy, external quantum efficiency values up to 23% were realized in solution-processed green OLEDs, which is close to the theoretical efficiency limit.
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