Organic EL Hole Injection Material Reducing Voltage and Leakage
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Solution Overview
Problem
Conventional organic electroluminescence (EL) devices have high driving voltage, large leakage current, and short lifetime, limiting their practical application.
Innovation Solution
A novel compound with a specific structure is used as a hole injecting material, optimizing electron-accepting properties and thin film formation to reduce driving voltage and leakage current, while extending the device's lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional organic EL device materials are used, then the device can be manufactured with existing technology, but the driving voltage is high and leakage current is large
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of organic compounds used in the EL device. Specifically, it introduces compounds with structure (1) containing electron-accepting groups (cyano, nitro, or carbonyl groups at positions 2 and 6) and aromatic hydrocarbon groups at positions 3 and 5, which changes the electrical and optical parameters of the material to achieve lower driving voltage and reduced leakage current while maintaining manufacturability
Solution Approach 2:
The patent employs composite materials by combining specific structural elements within the organic compound molecules. The compounds consist of multiple functional groups (electron-accepting groups and aromatic hydrocarbon groups) integrated into a single molecular structure, creating a composite material that exhibits improved electrical properties including lower driving voltage and reduced leakage current compared to conventional materials
2Device complexity
If conventional organic EL device materials are used, then the device structure is simple, but the lifetime is short
Solution Approach 1:
The patent improves lifetime by changing the chemical parameters of the organic materials. The specific molecular structure with electron-accepting groups and aromatic hydrocarbon groups enhances material stability and reduces degradation, thereby extending device lifetime without complicating the overall device structure
Solution Approach 2:
The patent addresses the short lifetime issue by developing new organic compounds that are stable and durable, replacing the conventional short-living materials. The novel compounds with structure (1) provide long-term operational stability, effectively transforming the transient nature of conventional organic EL materials into long-lasting functional materials
3Ease of manufacture
If conventional organic EL device materials are used, then the device can be produced with current technology, but the luminance and light emission efficiency are low
Solution Approach 1:
The patent enhances luminance and light emission efficiency by changing the optical and electrical parameters of the organic materials. The introduction of structure (1) with specific electron-accepting and aromatic hydrocarbon groups optimizes charge transport and recombination processes, resulting in higher luminance and efficiency while maintaining compatibility with existing manufacturing technologies
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 compound enables organic EL devices to operate with low voltage, reduced leakage current, and improved longevity, making them more suitable for practical use.
Implementation Method 1
the compound according to the present invention has high electron-accepting properties
Implementation Method 2
The emission of light from the EL device is such a phenomenon that, when an electric field is applied between these electrodes, electrons are injected into the emitting layer from the side of the cathode, while holes are likewise injected into the layer from the side of the anode, subsequently the electrons are recombined with the holes within the emitting layer to generate excited states and energies are converted in the form of light to be emitted when the excited states are brought back to the ground states
Data Source
AI summary
Disclosed is a novel compound useful as a constituent of an organic EL device. Also disclosed is a practical organic EL device using this compound. This organic EL device has low driving voltage, long life, and reduced leakage current. Specifically disclosed is a compound characterized by having at least one structure (1) shown below in a molecule. Structure (1)