Heterocyclic Compounds for OLED Lifetime and Efficiency
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Solution Overview
Problem
There is a need for heterocyclic compounds that improve the performance of organic electroluminescent devices in terms of lifetime, efficiency, operating voltage, color purity, and processibility, particularly as emitters and matrix materials for red, green, and blue electroluminescent devices, while maintaining performance across a broad temperature range and being cost-effective.
Innovation Solution
The development of specific heterocyclic compounds with defined structures, including aromatic and heteroaromatic ring systems, which are used as emitters and matrix materials in organic electroluminescent devices to enhance their performance by optimizing their chemical structure for improved efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional phosphorescent organometallic complexes or fluorescent compounds are used as emitting materials, then electroluminescent devices can be manufactured, but the device lifetime and efficiency need improvement
Solution Approach 1:
The patent changes the chemical structure parameters of the emitting materials by introducing specific heterocyclic compounds with defined molecular structures (formula I) containing aromatic and heteroaromatic ring systems. This structural parameter change optimizes both the lifetime and efficiency of the electroluminescent devices simultaneously
Solution Approach 2:
The patent employs composite material strategies by combining heterocyclic compounds with specific functional groups (Z1, Z2, W1, V1, V2, W2 groups) to create novel emitting materials that exhibit both long lifetime and high efficiency properties, overcoming the limitations of conventional single-material systems
2Reliability
If heterocyclic compounds with improved lifetime and efficiency are developed, then device performance increases, but the operating voltage and processibility must also be optimized
Solution Approach 1:
The patent optimizes molecular parameters such as HOMO-LUMO energy levels, molecular weight, and structural configuration of the heterocyclic compounds to achieve low operating voltage while maintaining improved lifetime and efficiency. The specific structural features in formula (I) are designed to facilitate charge transport at reduced voltage
3Reliability
If compounds are optimized for device performance, then lifetime and efficiency improve, but color purity and processibility must be maintained
Solution Approach 1:
The patent applies local quality by introducing specific functional groups and substituents at particular positions in the heterocyclic compound structure (formula I). These localized structural modifications optimize color purity and emission characteristics without compromising the overall device lifetime and efficiency
Solution Approach 2:
The patent changes optical parameters such as emission wavelength, full width at half maximum (FWHM), and quantum efficiency by adjusting the molecular structure of the heterocyclic compounds. This enables precise control over color purity while maintaining device performance
4Productivity
If specific heterocyclic compound structures are used to improve device performance, then efficiency and lifetime increase, but manufacturing cost and complexity must be considered
Solution Approach 1:
The patent segments the complex heterocyclic compound structure into modular components (core heterocyclic ring, substituent groups, linking moieties) that can be independently optimized and synthesized. This modular approach enables systematic improvement of device efficiency while managing structural complexity through standardized building blocks
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
These compounds lead to organic electroluminescent devices with improved lifetime, efficiency, and color purity, while maintaining low operating voltage and excellent processibility, and are suitable for a range of applications across varying temperatures.
Implementation Method 1
Emitting materials used in organic electroluminescent devices are frequently phosphorescent organometallic complexes or fluorescent compounds
Implementation Method 2
Emitting materials used in organic electroluminescent devices are frequently phosphorescent organometallic complexes or fluorescent compounds
Implementation Method 3
Emitting materials used in organic electroluminescent devices are frequently phosphorescent organometallic complexes or fluorescent compounds
Data Source
AI summary
The invention relates to heterocyclic compounds which are suitable for use in electronic devices, and to electronic devices, in particular organic electroluminescent devices, containing said compounds.