Nitrogen Hetero Ring Copolymer for Coated OLED Films

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Solution Overview

Problem

Current materials for organic electroluminescent devices lack both charge transporting properties and solubility, making it difficult to form films using a coating method effectively.

Innovation Solution

A copolymer with specific repeating units, including a main chain part and a nitrogen-containing condensed hetero ring, is developed, offering both charge transporting properties and solubility, allowing for film formation via coating methods in organic electronic devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If polymer materials with charge transporting properties are developed for coating methods, then solubility and film-forming capability are improved, but molecular weight increase is insufficient

Engineering Contradiction:

ImprovesolubilityVSAvoidmolecular weight

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent modifies the chemical structure parameters of the polymer by introducing specific repeating units with nitrogen-containing condensed hetero rings and adjusting the copolymer composition ratio, thereby achieving optimal balance between solubility and molecular weight for coating method fabrication

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a copolymer composite structure combining different repeating units (formula 1 and formula 2) to achieve synergistic effects, where one unit provides charge transporting properties while the other enhances solubility and molecular weight characteristics suitable for coating processes

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If copolymer structures are designed for coating method applicability, then film-forming capability is improved, but charge transporting properties may be compromised

Engineering Contradiction:

Improvefilm-forming capabilityVSAvoidcharge transporting properties

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent introduces different repeating units with distinct functions at local levels: formula 1 units provide charge transporting capability through nitrogen-containing hetero rings, while formula 2 units enhance solubility and film-forming properties, achieving local optimization of both requirements

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent optimizes the compositional ratio parameter between different repeating units to achieve the right balance, where sufficient charge transporting units are maintained while enough solubility-enhancing units are included to enable coating method fabrication

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9847490B2Copolymer, material for organic electronic element, material for organic electroluminescent element, and organic electroluminescent element

Publication Date: 2017.12.19 IDEMITSU KOSAN CO LTD

AI summary

Provided are a copolymer having plural repeating units each having a specific structure, and having a weight-average molecular weight of from 100,000 to 3,000,000; a material for organic electronic devices and a material for organic electroluminescent devices containing the copolymer; a solution containing the copolymer and a solvent; and an organic electroluminescent device using the material for organic electroluminescent devices. The copolymer has not only charge transporting properties but also solubility and is suitable for forming a film according to a coating method. The present invention provides the copolymer, and a material for organic electronic devices and a material for organic electroluminescent devices containing the copolymer, an organic electroluminescent device, and a solution containing the copolymer.