Fused-Ring Organic Compound for OLED Efficiency and Lifespan

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Solution Overview

Problem

Current OLEDs face limitations in luminance, efficiency, and lifespan due to the need for multi-layer structures and the challenge of balancing charge transfer between organic functional layers.

Innovation Solution

An organic compound with a fused-ring carbazolo-fluorene structure and nitrogen-containing electron transport groups is used as an electron transport layer or light-emitting layer material, enhancing hole mobility, preventing molecular stacking, and improving film stability, thereby improving carrier migration and device performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a multi-layer structure is adopted to improve luminance and efficiency, then the injection efficiency of carriers is improved, but the device complexity increases

Engineering Contradiction:

ImproveluminanceVSAvoidmulti-layer structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent combines the electron transport layer and light-emitting layer functions into a single organic compound molecule. The compound contains electron transport groups (such as triazole, tetrazole, or pyridine rings) integrated with light-emitting moieties, allowing one material to perform multiple functions that traditionally required separate layers, thereby reducing device complexity while maintaining high luminance and carrier injection efficiency

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The organic compound is designed with multi-functional groups that enable it to simultaneously serve as an electron transport material and a light-emitting material. The molecule contains both electron-transporting moieties (with high electron mobility) and light-emitting groups (with appropriate HOMO-LUMO gaps), making it a universal material that can replace multiple specialized materials in the OLED structure

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Productivity

If organic functional materials are used to achieve charge transfer, then the HOMO and LUMO levels are adjusted for efficient charge transfer, but the lifespan of the device is limited

Engineering Contradiction:

Improvecharge transfer efficiencyVSAvoiddevice lifespan

Core Design Contradiction:

ProductivityVSDuration of action of stationary object

Solution Approach 1:

The patent systematically adjusts molecular parameters including HOMO-LUMO energy gap, electron mobility, and molecular weight by modifying the chemical structure. The compound is designed with specific electron-deficient heteroaryl groups and electron-rich moieties to optimize charge transfer while the molecular weight and structural rigidity are controlled to reduce degradation, thereby extending device lifespan while maintaining efficient charge transfer

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The organic compound functions as a composite material integrating multiple functional groups within a single molecular structure. It combines electron-transporting groups (such as triazole, tetrazole), light-emitting moieties, and stabilizing structural elements, creating a composite functional material that simultaneously achieves efficient charge transfer and enhanced stability for extended device operation

Inventive Principle:

Principle #40Composite materials

3Stability of the object's composition

If the organic compound prevents molecular stacking, then the film stability is improved, but the manufacturing precision requirements increase

Engineering Contradiction:

Improvefilm stabilityVSAvoidfilm formation control

Core Design Contradiction:

Stability of the object's compositionVSManufacturing precision

Solution Approach 1:

The patent introduces localized bulky substituents (such as tert-butyl groups, adamantyl groups, or large aromatic substituents) at specific positions on the molecular structure. These local structural modifications create steric hindrance that prevents molecular stacking and aggregation, thereby improving film stability and reducing crystallization tendency without requiring complex manufacturing processes

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The compound is designed with molecular structures that form stable amorphous films under simple vacuum deposition conditions. The bulky substituents and rigid core structures ensure that the material forms stable, non-crystalline films during manufacturing, reducing the need for precise control of deposition parameters and simplifying the manufacturing process while maintaining film stability

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS20230301184A1Organic compound, organic electroluminescent device and electronic apparatus thereof

Publication Date: 2023.09.21 SHAANXI LIGHTE OPTOELECTRONICS MATERIAL CO LTD

AI summary

The present application relates to an organic compound, and there are electron transport and injection groups and a conjugated fused heteroaromatic ring in a structure of the organic compound. The organic compound can be used in a functional layer of an organic light-emitting device (OLED). When used in an OLED, the organic compound of the present application can improve the light-emitting efficiency and service life of the OLED.