Periodic Reporting for period 2 - MOSTOPHOS (Modelling stability of organic phosphorescent light-emitting diodes)
Reporting period: 2016-12-01 to 2018-05-31
We have organized an international workshop in Grenoble in 2017 (https://www.cecam.org/workshop-1383.html). The workshop was one of the major network and training events in the field. Moreover, a summer school was held in Mittelwihr in 2017 (http://www.softmattergraduate.uni-freiburg.de/summerschool2017) an international training activity for PhD students.
We have actively communicated with industrial partners, also outside the consortium: Schroedinger, Philips, sim4tec, OSRAM-OLED, BASF, FLUXIM, MERCK and CYNORA. Several collaborative spin-offs will continue even after the end of the project.
A clear set of results has been achieved:
1. We have developed and validated the models for the degradation process of OLEDs and the so-called efficiency roll-off, which is the reduction in efficiency of an OLED as the voltage is increased.
2. We have developed a developed software suite, including a streamlined GUI, which could help companies identify the right materials for OLED applications. Software package is designed to obtain OLED characteristics from scratch, starting from the chemical structures.
3. We have established the contacts with major European industrial players in the field (MERCK, CYNORA, OSRAM-OLED).
4. We have streamlined and aligned our codes, including interfaces and documentation of the data output.
5. We have proposed a new concept for overcoming limiting life-times of a blue pixel (Unicolor Phosphor Sensitized Fluorescence), proved it experimentally and identified directions for its further improvements.
Overall, this was a very dynamic and complex project. We have seen how the extremely competitive field of OLEDs forced a relocation of a large research flagship project from one company to another. Because of this, the project goals had to be re-oriented from a pure phosphorescent to a TADF OLED right in the middle of the action.
In spite of this, the project clearly fulfilled its initial goals. Moreover, because of this unforeseen changes in the consortium, we had to practically double our efforts, which of eventually resulted in an exceptionally high output: more than 60 publications and proceedings, 3 book chapters, and more than 80 conference presentations. In just three years we have co-organized an international workshop with more than 100 participants, and organized 8 well-attended software workshops.
Most importantly, the project has proposed a practical solution to the challenging problem of blue OLED stability, the new Unicolor Phosphor Sensitized Fluorescence (UPSF) concept. It has also contributed to the issue of reducing the injection barrier from a transparent electrode (oxide) into an organic layer by a novel way of injecting charge through a thin organic interlayer, thus helping to improve OLED efficiency by decreasing the contact resistance. Thus results will have an impact on both academic and industrial OLED designs.