Branched Charge-Transporting Polymer for Wet-Processed Organic EL

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Solution Overview

Problem

The wet-type process for manufacturing organic EL elements is inefficient and requires improvement in terms of element characteristics and efficiency.

Innovation Solution

An organic electronic material with a charge transporting polymer having a branched structure and a specific structural unit, represented by Formula (1), is used to form an organic layer with high solubility and charge transportability, facilitated by a liquid composition that can be easily prepared and applied using a wet-type process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If a wet-type process is used for manufacturing organic EL elements, then large-area and low-cost production is enabled, but manufacturing efficiency and element characteristics are insufficient

Engineering Contradiction:

Improvedisplay areaVSAvoidmanufacturing efficiency

Core Design Contradiction:

Area of stationary objectVSProductivity

Solution Approach 1:

The patent changes the chemical structure parameters of the charge transporting polymer by introducing a specific structural unit (Formula 1) with aromatic ring groups and substituents. This structural modification improves solubility and enables better film formation in wet-type processes, thereby increasing manufacturing efficiency while maintaining large-area production capability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system by combining the charge transporting polymer with specific solvents and additives. This composite approach optimizes the liquid composition for wet-type processing, improving both manufacturing efficiency and element characteristics while preserving large-area production benefits

Inventive Principle:

Principle #40Composite materials

2Reliability

If conventional organic materials are used, then basic functionality is achieved, but charge transportability and solubility are insufficient

Engineering Contradiction:

Improvecharge transportabilityVSAvoidsolubility

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent modifies the molecular parameters of the charge transporting polymer by incorporating structural units with Formula (1) that contain aromatic ring groups (Ar) and specific substituents (Ra, Rb). This structural parameter change simultaneously improves charge transportability through enhanced molecular packing and electron mobility, while the substituent groups improve solubility in common solvents for easier manufacturing

Inventive Principle:

Principle #35Parameter changes

3Productivity

If the wet-type process is improved for efficiency, then manufacturing speed increases, but element lifespan characteristics may deteriorate

Engineering Contradiction:

Improvemanufacturing efficiencyVSAvoidelement lifespan

Core Design Contradiction:

ProductivityVSDuration of action of stationary object

Solution Approach 1:

The patent optimizes the chemical structure parameters of the charge transporting polymer to achieve a balance between processing efficiency and device stability. The specific structural unit (Formula 1) with aromatic rings and substituents enables efficient wet-type processing while the molecular structure provides stability for long element lifespan, resolving the contradiction between manufacturing efficiency and durability

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12365759B2Organic electronic material and organic electronic element

Publication Date: 2025.07.22 RESONAC CORP

AI summary

An organic electronic material that includes a charge transporting polymer which has a branched structure and has a structural unit having a structure represented by Formula (1).