Organic Electronic Element Host-Dopant Composition for Efficiency

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Solution Overview

Problem

Current organic electronic elements face challenges in achieving high luminous efficiency, color purity, stability, and lifespan due to limitations in the organic material layer, particularly in the host material for the emitting layer.

Innovation Solution

A composition comprising a mixture of a compound represented by Formula 1 and a compound represented by Formula 2 or Formula 5 is used to form an organic electronic element, which improves the driving voltage, luminous efficiency, color purity, stability, and lifespan of the element.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single light emitting material is used, then the device structure is simple, but color purity is lowered and luminous efficiency is reduced due to intermolecular interaction and emission attenuation

Engineering Contradiction:

Improvedevice structureVSAvoidcolor purity

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent uses a host/dopant composite material system where a host material and dopant material are combined in the emitting layer. The dopant (e.g., Ir(ppy)3, PtOEP) has a smaller energy band gap than the host, enabling efficient energy transfer from host to dopant. This composite approach achieves high color purity and luminous efficiency while maintaining reasonable device structure complexity.

Inventive Principle:

Principle #40Composite materials

2Productivity

If efficiency is increased, then luminous efficiency improves, but driving voltage increases and Joule heating increases which shortens lifespan

Engineering Contradiction:

Improveluminous efficiencyVSAvoidlifespan

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent optimizes multiple parameters including the energy levels, T1 values, HOMO/LUMO levels, and mobility of organic materials in the emitting layer. By carefully selecting and combining materials with complementary properties (e.g., host material with high mobility and dopant with appropriate energy gap), the system achieves high luminous efficiency while maintaining low driving voltage and resistance to Joule heating, thus extending device lifespan.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If metal oxide penetration from anode is delayed, then lifespan increases, but this requires materials with strong heat resistance which limits material selection

Engineering Contradiction:

ImprovelifespanVSAvoidmaterial selection

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent introduces an electron transport layer positioned between the anode and the emitting layer. This intermediary layer acts as a protective barrier that prevents metal oxide penetration from the anode into the organic layers, thereby extending device lifespan. The electron transport layer is specifically designed with appropriate energy levels and heat resistance properties to fulfill this protective function while allowing electron transport.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Productivity

If host and dopant energy levels are optimized, then energy transfer efficiency improves, but device complexity increases due to multi-layer structure requirements

Engineering Contradiction:

Improveenergy transfer efficiencyVSAvoidmulti-layer structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent combines the host material and dopant material within the same emitting layer, forming a homogeneous mixture that facilitates efficient energy transfer. The emitting layer integrates multiple functions (energy absorption, energy transfer, light emission) in a single layer structure, reducing the need for additional separate layers and simplifying the overall device structure while maintaining high energy transfer efficiency.

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 the described composition results in high luminous efficiency, low driving voltage, and improved heat resistance, along with enhanced color purity and extended lifespan of the organic electronic element.

Implementation Method 1

when a small amount of a dopant having a smaller energy band gap than that of the host forming the emitting layer is mixed in the emitting layer, excitons generated in the emitting layer are transported to the dopant to emit light with high efficiency

Methodology Applied

Scientific EffectEnergy transfer: Fluorescence

Implementation Method 2

organic light emitting phenomenon refers to a phenomenon that converts electric energy into light energy by using an organic material

Methodology Applied

Scientific EffectOrganic light emitting phenomenon: Electroluminescence

Implementation Method 3

crystallization of organic materials due to Joule heating generated during driving decreases

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS12317748B2Organic electronic element comprising compound for organic electronic element and an electronic device thereof

Publication Date: 2025.05.27 DUK SAN NEOLUX

AI summary

Provided are a compound that can improve the luminous efficiency, stability, and lifespan of an organic electronic element, an organic electronic element employing the compound, and an electronic device thereof.