Organic Compound Triazin Core Reduces OLED Driving Voltage
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Solution Overview
Problem
The existing organic light emitting diodes (OLEDs) face issues with increased driving voltage and decreased emitting efficiency and lifetime due to the diffusion of alkali metals into the electron transporting layer, which reduces the electron injection property.
Innovation Solution
An organic compound with a triazin core and bipyridine moiety is used, connected via a linker, to enhance electron transporting and injection properties, preventing electron localization and improving the efficiency of electron injection into the emitting material layer, while also preventing the diffusion of alkali metals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an alkali metal or alkali earth metal is included in the electron injection layer, then the electron injection property is improved, but the alkali metal diffuses into the electron transporting layer causing increased driving voltage and decreased emitting efficiency and lifetime
Solution Approach 1:
The patent introduces a specific organic compound as an intermediary material between the alkali metal-containing electron injection layer and the electron transporting layer. This intermediary compound prevents the diffusion of alkali metals into the electron transporting layer while maintaining effective electron injection, thereby resolving the contradiction between improving electron injection property and preventing lifetime degradation
Solution Approach 2:
The patent modifies the chemical composition and structural parameters of the organic compound used in the electron transporting layer. By selecting compounds with specific molecular structures and electronic properties, the patent optimizes the energy levels and transport characteristics to prevent alkali metal diffusion while maintaining high electron injection efficiency, thus improving both reliability and lifetime
2Reliability
If an alkali metal or alkali earth metal is included in the electron injection layer, then the electron injection property is improved, but the amount of electron from the electron injection layer into the electron transporting layer is decreased
Solution Approach 1:
The patent optimizes the energy level parameters and molecular structure of the organic compound in the electron transporting layer to achieve better energy level alignment with the electron injection layer. This parameter optimization ensures that electrons can be effectively injected from the electron injection layer into the electron transporting layer, maintaining high emitting efficiency while utilizing the electron injection enhancement provided by alkali metals
3Reliability
If an alkali metal or alkali earth metal is included in the electron injection layer, then the electron injection property is improved, but the driving voltage is increased
Solution Approach 1:
The patent adjusts the energy level parameters and electronic structure of the organic compound in the electron transporting layer to optimize the energy level alignment with the electron injection layer. This parameter optimization reduces the energy barrier for electron injection, allowing for effective electron transfer at lower driving voltages, thus resolving the contradiction between improving electron injection property and maintaining low driving voltage
Data Source
AI summary
The present invention provides an organic compound represented by:an organic light emitting diode and an organic light emitting display device using the organic compound. The organic compound of the present invention is capable of reducing a driving voltage of an organic light emitting diode and improving an emitting efficiency and a lifetime of the organic light emitting diode and the organic light emitting display device including the organic compound.