Polycyclic Compounds in Charge Generation Layers for Low-Voltage Tandem OLEDs

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Solution Overview

Problem

Existing organic electronic elements face challenges in maximizing luminous efficiency, lifespan, and reducing driving voltage, particularly in Tandem OLEDs, due to insufficient development of stable and efficient organic material layers.

Innovation Solution

The use of polycyclic compounds represented by Formula (32) in the charge generation layer of organic electronic elements, specifically as a p-type charge generation layer, to enhance charge distribution and reduce optical energy loss.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional organic materials are used in the charge generation layer, then the device can be manufactured with existing materials, but the luminous efficiency and lifespan are insufficient

Engineering Contradiction:

Improveluminous efficiencyVSAvoidlifespan

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent modifies the chemical structure parameters of organic materials by introducing specific polycyclic compound structures with defined molecular weights and functional groups. This structural parameter change optimizes charge generation efficiency and device stability, simultaneously improving luminous efficiency and lifespan without requiring entirely new material systems

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite organic material systems in the charge generation layer, combining polycyclic compounds with complementary functional properties. This composite approach allows synergistic effects that enhance both luminous efficiency through improved charge generation and lifespan through enhanced material stability and reduced degradation

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If the driving voltage is reduced to save power, then power consumption decreases, but the efficiency of charge generation may be compromised

Engineering Contradiction:

Improvepower consumptionVSAvoidcharge generation efficiency

Core Design Contradiction:

Use of energy by moving objectVSProductivity

Solution Approach 1:

The patent optimizes the energy level parameters (HOMO/LUMO levels) of the polycyclic compounds in the charge generation layer to achieve better energy alignment with adjacent layers. This parameter optimization enables efficient charge generation at lower driving voltages, reducing power consumption while maintaining or improving charge generation efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces high-voltage-driven charge generation mechanisms with materials that enable low-voltage operation through intrinsic molecular properties. The polycyclic compounds' inherent charge generation capability substitutes for high-voltage requirements, achieving efficient charge generation at reduced voltages and lower power consumption

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of manufacture

If the organic material layer is simplified to reduce manufacturing complexity, then ease of manufacture improves, but color purity and luminous efficiency decrease

Engineering Contradiction:

Improvemanufacturing complexityVSAvoidcolor purity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent achieves color purity enhancement through precise control of the polycyclic compound's molecular structure parameters, including ring size, substitution patterns, and conjugation length. These parameter optimizations enable narrow emission spectra and high color purity that can be achieved through material design rather than complex multi-layer structures, simplifying manufacturing while maintaining precision

Inventive Principle:

Principle #35Parameter changes

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

This approach achieves high luminous efficiency, low driving voltage, and improved heat resistance, along with increased color purity and lifespan of the organic electronic elements.

Implementation Method 1

the organic material layer includes a charge generation layer, and the compound according to claim 1 is included in the charge generation layer

Methodology Applied

Scientific EffectCharge generation:

Implementation Method 2

to enhance charge distribution

Methodology Applied

Scientific EffectCharge transport:

Implementation Method 3

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

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 4

the excitons generated in the emitting layer are transported to the dopant to emit light with high efficiency

Methodology Applied

Scientific EffectEnergy transfer:

Implementation Method 5

to enhance charge distribution and reduce optical energy loss

Methodology Applied

Scientific EffectOptical energy loss reduction:

Data Source

PatentUS20250243162A1Compound for organic electric element, organic electric element using the same, and electronic device thereof

Publication Date: 2025.07.31 DUK SAN NEOLUX

AI summary

Provided are a compound of Formula 32 capable of improving luminous efficiency, stability and lifetime of an organic electric element employing the same, the organic electric element and an electronic device thereof.