High Molecular Weight Polymeric Binder for Organic Electronic Ink Formulation
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Solution Overview
Problem
Existing formulations for organic electronic devices, such as OLEDs and OPV cells, face challenges in achieving high efficiency, long lifetime, and low sensitivity to water or oxidation, while also requiring cost-effective and high-speed printing processes, particularly for flexible devices.
Innovation Solution
A formulation comprising an organic semiconducting compound with a molecular weight of up to 5,000 g/mol, a polymeric binder with a weight average molecular weight of at least 8,000,000 g/mol, and a viscosity of at least 15 mPas at 25°C, using aromatic and/or heteroaromatic solvents, is developed for use as a conducting ink in organic electronic devices, enabling improved film forming and printing quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymeric binders with high molecular weight (at least 8,000,000 g/mol) are used to improve film forming ability and device performance, then efficiency and lifetime of OLED devices are improved, but viscosity of the formulation increases (at least 15 mPas at 25°C)
Solution Approach 1:
The patent specifies precise molecular weight parameters for the polymeric binder (at least 8,000,000 g/mol) and formulation viscosity (at least 15 mPas at 25°C) to optimize both film forming ability and printability. By controlling these physical parameters within defined ranges, the invention resolves the contradiction between achieving high reliability through high molecular weight polymers and maintaining processability through controlled viscosity.
2Manufacturing precision
If high molecular weight polymeric binders are used to enhance film forming ability, then printing quality and homogeneity are improved, but the cost of materials increases
Solution Approach 1:
The patent defines specific molecular weight thresholds for the polymeric binder (at least 8,000,000 g/mol) to achieve optimal film forming properties and printing quality. By establishing this parameter boundary, the invention balances manufacturing precision requirements with material cost considerations, as higher molecular weight polymers provide better film formation but at increased cost.
3Ease of operation
If low molecular weight organic light emitting materials are used, then solubility is improved enabling printing techniques, but film forming ability deteriorates
Solution Approach 1:
The patent introduces a polymeric binder with high molecular weight (at least 8,000,000 g/mol) as an intermediary component to compensate for the poor film forming ability of low molecular weight organic light emitting materials. The binder acts as a matrix that provides structural support and improves film formation, while the low molecular weight emitter maintains good solubility for printing applications.
Data Source
AI summary
The present invention relates to a formulation comprising at least one organic semiconducting compound (OSC) having a molecular weight of at most 5000 g/mol, at least one organic solvent, and at least one polymeric binder having a weight average molecular weight of at least 5.000.000 g/mol, wherein the formulation comprises a viscosity at 25°C of at least 15 mPas. Furthermore, the present invention relates to the use of these formulations as inks for the preparation of organic electronic (OE) devices, preferably organic photovoltaic (OPV) cells and organic light emitting diodes (OLED) devices, to methods for preparing OE devices using these formulations, and to OE devices, OLED devices and OPV cells prepared from such methods and formulations.