Organic Compound for Lowering Driving Voltage in OLEDs

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Solution Overview

Problem

Organic electroluminescent devices face challenges in achieving high efficiency and long lifespan due to suboptimal energy levels and interfacial properties within the organic material layers, and require an emission-auxiliary layer to address luminescence issues in hole transport layers, necessitating the development of materials that improve driving voltage, luminous efficiency, and lifetime.

Innovation Solution

A compound represented by a specific formula is used in the organic electric element, specifically in layers such as the hole injection layer, hole transport layer, emission-auxiliary layer, light emitting layer, electron transport layer, and electron injection layer, optimizing energy levels and interfacial properties to reduce driving voltage and enhance efficiency and lifespan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional organic material layers are used in organic electroluminescent devices, then the device structure is simple and ease of manufacture is maintained, but the luminous efficiency is low and driving voltage is high

Engineering Contradiction:

Improveluminous efficiencyVSAvoiddriving voltage

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent applies parameter changes by systematically optimizing the chemical structure of organic compounds in the material layers. Specific molecular structures with defined energy levels (HOMO/LUMO), carrier mobility values, and triplet energy (T1) values are selected to achieve optimal energy transfer, reduced non-radiative recombination, and improved charge transport, thereby simultaneously enhancing luminous efficiency and reducing driving voltage.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite materials by combining multiple organic compounds with complementary properties in the same layer or across different layers. This includes mixing host materials with dopants, combining electron-transporting and hole-transporting materials, and creating multi-component systems that synergistically improve both efficiency and voltage characteristics.

Inventive Principle:

Principle #40Composite materials

2Device complexity

If the organic material layer structure is simplified, then device complexity is reduced and ease of manufacture is improved, but energy level optimization and interfacial properties cannot be achieved

Engineering Contradiction:

Improveorganic material layer structureVSAvoidenergy level and interfacial properties

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent applies universality by designing multi-functional organic compounds that can serve multiple roles within the same layer or across different layers. For example, certain compounds function as both charge transport materials and emission auxiliaries, or as host materials that simultaneously provide structural framework, energy transfer pathways, and interfacial compatibility, thereby maintaining simple device structure while achieving optimal performance.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If emission-auxiliary layers are added to solve luminescence issues in hole transport layers, then luminous efficiency is improved, but device complexity and material development requirements increase

Engineering Contradiction:

Improveluminous efficiencyVSAvoidlayer structure and material requirements

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies merging by integrating the functions of hole transport layers and emission-auxiliary layers into a single multi-functional layer or by using compounds that simultaneously perform both roles. This eliminates the need for separate dedicated emission-auxiliary layers, reducing device complexity while maintaining improved luminous efficiency through the combined charge transport and emission enhancement capabilities.

Inventive Principle:

Principle #5Merging (Combining)

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 this compound significantly lowers driving voltage and improves luminous efficiency and lifetime of the organic electric element by optimizing energy levels and interfacial properties, outperforming comparative examples with similar structures but different substituents.

Implementation Method 1

An organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy of an organic material

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 2

the crystallization of an organic material due to Joule heating generated during operation is reduced as driving voltage is lowered

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS20230345821A1Compound for organic electric element, organic electric element using the same, and an electronic device thereof

Publication Date: 2023.10.26 DUK SAN NEOLUX

AI summary

A compound according to an embodiment is represented by Formula 1. An organic electric element includes a first electrode, a second electrode, and an organic material layer including the compound represented by Formula 1 between the first electrode and the second electrode. The driving voltage of the organic electric element can be lowered, and the luminous efficiency and life time can be improved.