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Stefan Mogck, Jacqueline Hauptmann, Claudia Keibler, Christian MayFraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP
HIGHLY CONDUCTIVE POLYMER FILM FOR LARGE AREA LIGHTING
High conductivity embedded metallic wires result in a conductivity of 0.01 Ohmand in a transparency of about 90%. Electrode film and OLED embedded in a so called “Ravioli” approach.
SIDE INGRESS VERSUS DIFFUSION THROUGH THE BARRIER ADHESIVE
Ca-test lamination of ZTO / Al2O3 coated glass with 5 mm edge sealing Side diffusion > 10-4 g/m²d (adhesive without water getter) Interfacial diffusion means strong dependency of the barrier film
LIFETIME MEASUREMENT FROM R2R OLEDS ON BARRIER FOILS
#7B dark spots: 0.18%#7B dark spots: 0.08% #20A dark spots: 0.02% #20A dark spots: 0.03%
Part 2: with out-gassing in vacuum (OLED 1 cm² and 10 cm²)Part 1: no out-gassing in vacuum
OLED devices after 1500h storage under ambient condition on WVTR 10-3 g/d*m² barrier film.
OLEDs from not out-gassed part show higher level of degradation (shadings) -> water residues cause a significant reduction of the OLED lifetime (1x1 cm²).
For “large” OLED areas at present it´s hard to get it dark spot free just a matter of price to guarantee very low pinhole levels in plastic barrier films?
AUTOCLAVE EXPERIMENTS OF ROLL-TO-ROLL OLED SAMPLES FOR AUTOMOTIVE APPLICATIONS
OLED on PET plastic barrier film. Temperature treatment at 125 °C for 90 minutes at 1 bar. Resin interlayer film: EVA Tiny degradation after autoclave process visible. Trend of higher leakage current!
Residual layer stress by TCO coatings on ultra-thin glass
Water vapor transmission rate for barrier films is an important value, but there exist more criteria to meet the requirements.
Good statistic analysis is needed for identification of killer defects.
Memory effect in coils: Standardization of winding and web tension.
Keep the OLED substrate development untouched for a while
Ultra-thin glass helped a lot for R2R process development
Changing of planarization and interlayer in barrier coatings have a huge impact on the winding process and process.
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 688093
Consortium & Capabilities
The pilot line includes all the steps required to create advanced flexible OLED product prototypes:• High performance moisture barrier and electrode films• Flexible OLED fabrication in sheet-to-sheet and roll-to-roll process• Flexible device encapsulation• Lamination, bonding and system-level hybrid integration of thin film flexible electronics
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10/25/2017
2017 OLED DOE Stakeholder Meeting, October 10-11th, 2017, St. Paul, MN
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 688093
PI-SCALE
The PI-SCALE pilot line service fills that gap and helps to translate your ideas into products
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TRL 1-4Research
Mainly Public
TRL 5-7Technology
DevelopmentPublic/Private Collaboration
TRL 8 & 9Commercializa
tionPrivate
10/25/2017
2017 OLED DOE Stakeholder Meeting, October 10-11th, 2017, St. Paul, MN
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 688093
Roll-to-roll OLED fabrication can be made feasible on metal-, plastic- and ultra-thin glass web for different kind of target applications Ultra-thin glass: great opportunity for high quality and dark spot free OLED
devices Metal foil: good heat management, but extra planarization layer needed Plastic barrier film: high bendability, but how to guarantee no pin holes?
Comparable power efficacy between R2R and lab-scale OLED possible Residual water as the most critical impact for reproducibility for R2R
manufacturing get the polymer film as thin as possible! Reliability improvements will be pushed within the EU PI-Scale project for S2S
and R2R Starting pilot production in Roll-to-Roll fabrication on ultra-thin glass with barrier
film as encapsulation coming soon feasible Remove residual moisture in coils needs to further minimized < 100 ppm Changes in the barrier film layer structure influences the winding behavior Module separation and patterning as currently hot development topics
The research is funded within the framework for technology promotion by means of the European Fund for Regional Development (EFRE) as well as by means of the Free State of Saxony.
Parts of this work were supported by the German Federal Ministry of Education and Research within the projects R2Flex (FKZ 13N11058), R2D2 (FKZ: 13N12948) and this activities has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No. 688093 (PI-SCALE).
Special thanks to my colleagues, especially: Michael Stanel, André Philipp, Matthias Fahland, John Fahlteich, Nicolas Schiller, Manuela Junghähnel, Michael Törker, Jan Hesse