Double Spiro Compound for OLED Electron Transport

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Solution Overview

Problem

There is a continuous need for developing new materials to improve the efficiency and stability of organic light emitting devices, particularly in terms of reducing driving voltage and enhancing lifetime characteristics.

Innovation Solution

An organic light emitting device is developed using a double spiro structured compound incorporated into the organic material layer, which includes a specific chemical formula that enhances electron transport and injection properties, thereby improving device efficiency and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic materials are used in the organic material layer, then the device structure is simple, but the efficiency and lifetime characteristics are insufficient

Engineering Contradiction:

Improvelifetime characteristicsVSAvoidmolecular structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs a composite molecular structure combining spirobifluorene core with dibenzofuran or dibenzothiophene moieties, creating a hybrid organic material that integrates the structural stability of spiro compounds with the electron transport capabilities of heterocyclic groups, thereby achieving improved lifetime characteristics while maintaining reasonable structural complexity

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent systematically varies molecular parameters including substituent types (electron-donating or electron-withdrawing groups), substituent positions, and heterocyclic group selections to optimize the balance between molecular structure complexity and device performance, specifically targeting improved lifetime characteristics

Inventive Principle:

Principle #35Parameter changes

2Use of energy by moving object

If conventional organic materials are used in the organic material layer, then the material selection is simple, but the driving voltage remains high

Engineering Contradiction:

Improvedriving voltageVSAvoidmolecular structure complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent adjusts key molecular parameters including HOMO-LUMO energy levels, electron affinity, and molecular geometry through systematic modification of the spirobifluorene core and substitution patterns, thereby optimizing electron transport properties and reducing driving voltage requirements

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces functionally distinct regions within the molecule: the spirobifluorene core provides structural rigidity and stability, while the dibenzofuran/dibenzothiophene moieties contribute electron transport pathways, and specific substituents fine-tune energy levels, creating localized functional zones that collectively reduce driving voltage

Inventive Principle:

Principle #3Local quality

3Reliability

If conventional organic materials are used in the organic material layer, then the synthesis process is simple, but the electron transport properties are insufficient

Engineering Contradiction:

Improveelectron transport propertiesVSAvoidsynthesis complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent designs the molecule as segmented building blocks: a spirobifluorene core unit, dibenzofuran or dibenzothiophene units, and various substituent groups that can be synthesized separately and then coupled together through established organic synthesis methods, thereby improving electron transport properties while managing synthesis complexity through modular construction

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs universal synthetic strategies and common building blocks (spirobifluorene, dibenzofuran, dibenzothiophene) that can be combined through standard coupling reactions to generate multiple derivative compounds with different electron transport properties, enabling systematic optimization without requiring entirely new synthesis pathways for each variant

Inventive Principle:

Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The use of the double spiro structured compound in the organic material layer leads to improved efficiency, reduced driving voltage, and extended lifetime of the organic light emitting device, making it suitable for electron transport or injection applications.

Implementation Method 1

the compound according to at least one exemplary embodiment may improve efficiency, achieve low driving voltage and/or improve lifetime characteristics in the organic light emitting device. In particular, the compound described in the present specification may be used as a material for electron transport or electron injection.

Methodology Applied

Scientific EffectElectron transport: Conduction (electrical)

Implementation Method 2

An organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy by using an organic material... when the injected holes and electrons meet each other, an exciton is formed, and light is emitted when the exciton falls down again to a ground state.

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS10910567B2Double spiro-type compound and organic light emitting diode comprising same

Publication Date: 2021.02.02 LG CHEM LTD

AI summary

The present specification provides a double spiro structured compound and an organic light emitting device including the same.