PEDOT Complexes in Organic Solvents for OLED Stability
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Solution Overview
Problem
Current polythiophene/polyanion complexes, particularly those with polystyrene sulphonic acid, face limitations in solubility in water-immiscible solvents, leading to suboptimal film-forming properties and short OLED lifetime, with existing solutions requiring complex synthesis steps or polar solvents.
Innovation Solution
Development of complexes comprising polythiophene and sulphonated synthetic rubber, specifically styrene-diene or styrene-isoprene block copolymers, which are sulphonated and used in water-immiscible organic solvent systems, allowing for improved film-forming properties and longer OLED lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If PEDOT/PSS dispersions are used in water-immiscible solvents, then film-forming properties improve, but the complexes are not soluble in water-immiscible solvents
Solution Approach 1:
The invention changes the chemical structure of the polyanion by using sulphonated synthetic rubber instead of PSS, which fundamentally alters the solubility parameters of the complex to enable dissolution in water-immiscible solvents while maintaining film-forming capabilities
Solution Approach 2:
The invention creates a composite material system combining PEDOT with sulphonated synthetic rubber in a non-aqueous environment, producing a new type of complex that exhibits both solubility in water-immiscible solvents and good film-forming properties
2Ease of manufacture
If aqueous PEDOT/PSS dispersions are used to produce hole-injection layers in OLEDs, then the layers can be produced, but the lifetime of OLEDs decreases quickly
Solution Approach 1:
The invention changes the solvent system from aqueous to water-immiscible organic solvents and modifies the polyanion structure, which fundamentally improves the stability and lifetime of OLEDs while maintaining ease of manufacture through similar processing methods
3Quantity of substance
If existing methods are used to produce PEDOT-comprising systems in anhydrous solvents, then water content is reduced, but complex synthesis steps are required
Solution Approach 1:
The invention uses readily available starting materials including commercial sulphonated synthetic rubber and standard oxidizing agents, eliminating the need for complex multi-step syntheses while achieving low water content systems
Solution Approach 2:
The invention simplifies the synthesis pathway by changing the polyanion component to sulphonated synthetic rubber, which can be directly used in the polymerization reaction without requiring complex preparatory steps
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The complexes achieve high polythiophene concentrations, enhanced film-forming capabilities, and extended OLED lifetime with reduced surface resistance, using simpler synthesis steps and readily available starting materials.
Implementation Method 1
thiophene monomers are oxidatively polymerised in the presence of the sulphonated synthetic rubber
Implementation Method 2
complexes comprising a polythiophene and a sulphonated synthetic rubber... in a water-immiscible organic solvent or a mixture of water-immiscible organic solvents
Data Source
Figure 1
AI summary
The present invention relates to complexes comprising a polythiophene and a sulphonated synthetic rubber. The present invention also relates to a process for producing complexes, the complexes obtain¬ able by this process, a composition, a layer structure, a process for producing a layer structure, the layer structure obtainable by this process, electronic components and the use of a composition.