Nitrogen Heterocycle Phenanthrene for OLED Charge Balance

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Solution Overview

Problem

Existing organic electroluminescent devices face issues with electron transport imbalance, requiring higher driving voltages and reduced efficiency and lifespan due to the faster transport of holes compared to electrons in common materials.

Innovation Solution

Incorporating nitrogen-containing heterocycles such as pyridine, triazine, or pyrimidine into the phenanthrene structure enhances electronegativity, thermal stability, and electron transport performance, leading to the development of an organic electroluminescent compound with improved thermal stability, film-forming properties, and strong electron mobility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If common organic electroluminescent materials are used, then hole transport is fast, but electron transport is slow causing charge imbalance

Engineering Contradiction:

Improvehole transport speedVSAvoidcharge balance

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent modifies the molecular structure of organic electroluminescent materials by incorporating electron-transporting groups (such as pyridine, pyrimidine, triazine rings) into the core structure. This changes the electronic parameters of the material, specifically increasing electron mobility and adjusting HOMO/LUMO energy levels to achieve better charge balance between electrons and holes

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates composite molecular structures by combining electron-transporting heterocyclic groups with light-emitting moieties. This results in multifunctional materials that simultaneously provide hole transport, electron transport, and light emission capabilities, resolving the charge imbalance issue

Inventive Principle:

Principle #40Composite materials

2Power

If electron transport performance is improved, then driving voltage reduces, but material stability may be compromised

Engineering Contradiction:

Improvedriving voltageVSAvoidmaterial stability

Core Design Contradiction:

PowerVSStability of the object's composition

Solution Approach 1:

The patent optimizes molecular parameters by selecting specific heterocyclic groups and their positioning, achieving a balance between electron mobility enhancement and thermal stability maintenance. The结构设计 ensures that electron transport pathways are created without compromising the overall molecular framework stability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses stable heterocyclic building blocks (pyridine, pyrimidine, triazine rings) that are inherently thermally and chemically stable. These robust molecular units serve as reliable foundations that maintain material stability even when electron transport performance is enhanced through structural modifications

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Speed

If electronegativity is enhanced for better electron transport, then electron mobility increases, but thermal stability requirements become more stringent

Engineering Contradiction:

Improveelectron mobilityVSAvoidthermal stability

Core Design Contradiction:

SpeedVSTemperature

Solution Approach 1:

The patent carefully adjusts the electronegativity parameter by selecting appropriate heterocyclic groups and their substitution patterns. This optimization allows achieving high electron mobility while maintaining thermal stability within acceptable ranges for device operation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces electron-transporting heterocyclic groups at specific local positions within the molecular structure rather than uniformly throughout. This localized modification enhances electron mobility in critical regions while preserving thermal stability in other parts of the molecule

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20230086539A1Organic electronic material containing nitrogen atom heterocyclic ring, preparation method therefor and application thereof

Publication Date: 2023.03.23 SHANGHAI CHUANQIN NEW MATERIAL CO LTD

AI summary

The present disclosure provides an organic electronic material containing a nitrogen heterocycle and a preparation method and use thereof, and relates to the technical field of organic electroluminescence. Nitrogen-containing heterocycles such as pyridine, triazine or pyrimidine are introduced into a main structure of phenanthrene, such that the electronegativity of the material is enhanced, and the electron transport performance and the thermal stability of a compound are improved. The organic electron transport material provided by the present disclosure has a relatively good thermal stability, a high luminous efficiency and a high luminous purity. An organic light-emitting device prepared from the organic electronic material has effects of reducing a driving voltage, improving a luminous efficiency, enabling color purity to be excellent and prolonging a service life.