Conductive Polymer Buffer Layer for OLED Hole Injection
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Solution Overview
Problem
There is a need for buffer materials with improved properties in organic electronic devices, particularly in OLEDs, where existing materials do not adequately facilitate hole injection and transport.
Innovation Solution
An electrically conductive polymer composition is developed, comprising an electrically conductive polymer and a partially-fluorinated acid polymer, where at least 50% of the acid protons are replaced with inorganic or organic cations, enhancing conductivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing buffer materials are used in OLEDs, then device assembly is simple, but hole injection and transport performance is insufficient
Solution Approach 1:
The patent employs composite materials by combining electrically conductive polymers with partially fluorinated polymeric acids to create a buffer layer with superior hole injection and transport properties. This composite approach allows the integration of multiple functional components (conductive polymer for charge transport, fluorinated acid polymer for stability and conductivity enhancement) into a single buffer layer material that outperforms conventional single-material buffers.
Solution Approach 2:
The invention utilizes parameter changes by modifying the chemical composition parameters of the buffer layer - specifically incorporating partially fluorinated polymeric acids with controlled fluorine content and conducting polymer ratios. By adjusting these compositional parameters, the buffer layer achieves optimized electrical conductivity, thermal stability, and hole injection capability while maintaining processability.
2Stability of the object's composition
If conventional buffer materials are used, then manufacturing process is simple, but thermal stability is insufficient
Solution Approach 1:
The composite structure of conducting polymer and fluorinated acid polymer provides synergistic thermal stability. The fluorinated acid polymer component contributes high thermal stability due to the strong C-F bonds and stable polymeric structure, while the conducting polymer maintains electrical functionality. This composite approach achieves superior thermal stability without requiring complex multi-step manufacturing processes.
Solution Approach 2:
The patent achieves enhanced thermal stability by changing the chemical composition parameters - specifically incorporating fluorinated groups which have inherently high thermal stability due to the strength of carbon-fluorine bonds. The controlled incorporation of these fluorinated polymeric acid components raises the thermal decomposition temperature and improves overall thermal stability of the buffer layer.
3Reliability
If buffer layer conductivity is increased, then hole injection improves, but material complexity increases
Solution Approach 1:
The composite of conducting polymer and fluorinated acid polymer creates a synergistic effect where the fluorinated acid polymer enhances the electrical conductivity of the conducting polymer component. The acidic groups in the fluorinated polymer facilitate doping of the conducting polymer, increasing charge carrier density and electrical conductivity without requiring complex doping procedures or additional materials.
Solution Approach 2:
The fluorinated acid polymer acts as an intermediary that facilitates charge transport and enhances conductivity of the buffer layer. It serves as a mediating component between the anode and the EL material, providing both structural support and electrical functionality through its ability to donate protons and form conductive complexes with the conducting polymer.
Data Source
AI summary
There is provided an electrically conductive polymer composition. The composition includes an electrically conductive polymer and a partially-fluorinated acid polymer. At least 50% of acid protons on the partially-fluorinated acid polymer are replaced with cations. The cations can be inorganic cations, organic cations, and combinations thereof.