Bis-Triazine Charge Generation Layer for OLED Voltage and Lifespan

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Solution Overview

Problem

Existing organic electroluminescent devices face challenges in achieving low drive voltage, high luminous efficiency, and improved lifespan.

Innovation Solution

Incorporating a bis-triazine derivative compound in the n-type charge generation layer between light-emitting units, which enhances electron injection and minimizes alkali metal diffusion, thereby improving device performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If conventional charge generation layer materials are used, then device structure is simpler, but driving voltage is high and luminous efficiency is low

Engineering Contradiction:

Improvedriving voltageVSAvoiddevice structure

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The patent changes the chemical composition parameters of the charge generation layer by introducing bis-triazine derivative compounds with specific molecular structures (Formula 1) and substituents (R1-R4), which fundamentally alters the layer's electronic properties to achieve lower driving voltage and higher luminous efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite charge generation layer by combining the bis-triazine derivative compound (Formula 1) with other organic materials such as electron transport materials and hole block materials in specific weight ratios (e.g., 1:9 to 5:5), achieving synergistic effects that improve device performance

Inventive Principle:

Principle #40Composite materials

2Productivity

If conventional charge generation layer materials are used, then manufacturing process is simpler, but luminous efficiency is low

Engineering Contradiction:

Improveluminous efficiencyVSAvoidmanufacturing process

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent optimizes the molecular structure parameters of the charge generation layer materials, specifically using bis-triazine derivatives with controlled substituents (R1-R4 being alkyl, aryl, or heteroaryl groups) to enhance electron injection efficiency and achieve higher luminous efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies local quality enhancement by positioning the bis-triazine derivative compound specifically in the charge generation layer between light-emitting units, where it performs its most critical function of electron injection, while other layers use different materials optimized for their specific functions

Inventive Principle:

Principle #3Local quality

3Duration of action of stationary object

If conventional charge generation layer materials are used, then device structure is simpler, but lifespan is short

Engineering Contradiction:

ImprovelifespanVSAvoiddevice structure

Core Design Contradiction:

Duration of action of stationary objectVSDevice complexity

Solution Approach 1:

The patent converts the potential harm of alkali metal diffusion (which degrades device lifespan) into a benefit by using the bis-triazine derivative compound's specific molecular structure to block diffusion pathways, thereby extending device lifespan while maintaining the charge generation layer's essential function

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent introduces the bis-triazine derivative compound as an intermediary material between the light-emitting units and alkali metal sources, which mediates the interaction by providing a diffusion barrier while still allowing charge generation functions to occur

Inventive Principle:

Principle #24Intermediary (Mediator)

4Productivity

If conventional charge generation layer materials are used, then electron injection is insufficient, but material cost is lower

Engineering Contradiction:

Improveelectron injection efficiencyVSAvoidmaterial cost

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent changes the electronic parameters of the charge generation layer by using bis-triazine derivatives with specific HOMO-LUMO energy levels and electron affinity values, which fundamentally improves electron injection efficiency despite the use of more expensive specialized materials

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

The use of a bis-triazine derivative compound in the n-type charge generation layer results in organic electroluminescent devices with lower driving voltage, higher luminous efficiency, and extended lifespan.

Implementation Method 1

Incorporating a bis-triazine derivative compound in the n-type charge generation layer between light-emitting units, which enhances electron injection

Methodology Applied

Scientific EffectElectron injection: Electron Beam

Implementation Method 2

This energy causes the organic light-emitting compound to be in an excited state, and as the excited state of the organic light-emitting compound returns to its ground state, the energy is released as emitted light

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20240208924A1Compound and organic electroluminescent device comprising the same

Publication Date: 2024.06.27 DUPONT SPECIALTY MATERIALS KOREA LTD

AI summary

The present disclosure relates to compounds and organic electroluminescent devices comprising them. When a compound according to the invention is included in specific organic electroluminescent devices, the organic electroluminescent devices may exhibit low drive voltage, high luminous efficiency, and improved lifespan properties