Organic EL Electron Transport Composition for Low Voltage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic electroluminescence devices face challenges in achieving high performance with multiple materials used in combination, often resulting in deteriorated performance or failure to meet expected improvements in driving voltage and efficiency.
Innovation Solution
A composition comprising specific compounds represented by formulas (1) and (2), which are different, are used to enhance the performance of organic electroluminescence devices by forming a low-driving-voltage and high-efficiency organic EL device, with the compounds being used in the electron-transporting region between the emitting layer and the cathode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two or more materials are used in combination in an organic EL device, then device performance improvement is attempted, but the advantages of respective materials are not necessarily maintained and performance may be deteriorated
Solution Approach 1:
The patent changes the chemical structure parameters of the compounds by introducing specific heterocyclic groups (triazine, pyrimidine, pyridine rings) and controlling nitrogen atom positions to achieve optimal electron transport properties while maintaining material advantages in combinations
Solution Approach 2:
The patent uses composite materials by combining compounds with specific heterocyclic structures (formulas 1 and 2) that contain multiple heterocyclic rings and nitrogen atoms, creating synergistic effects that improve device performance while avoiding the pitfalls of random material combinations
2Ease of manufacture
If conventional materials are used in the electron-transporting region, then device fabrication is straightforward, but driving voltage remains high and efficiency is limited
Solution Approach 1:
The patent changes the electronic parameters of the electron-transporting materials by incorporating heterocyclic groups with specific nitrogen atom configurations, which modify the LUMO energy levels and electron mobility to reduce driving voltage while maintaining ease of fabrication through solution processing
3Device complexity
If conventional materials are used in the electron-transporting region, then device structure is simple, but efficiency is not sufficiently improved
Solution Approach 1:
The patent changes the molecular parameters of the compounds by introducing heterocyclic groups and controlling nitrogen atom positions to enhance electron transport efficiency while maintaining relatively simple device structures with standard layer configurations
Solution Approach 2:
The patent employs composite materials with specific heterocyclic compound combinations that achieve high efficiency through synergistic electron transport mechanisms while keeping the overall device structure simple and compatible with conventional fabrication processes
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 these compounds in the organic EL device achieves a significant reduction in driving voltage and improvement in efficiency, as demonstrated by the examples provided, where specific combinations and ratios of the compounds in the electron-transporting layers enhance the device's performance.
Implementation Method 1
When voltage is applied to an organic electroluminescence device, holes and electrons are injected into an emitting layer from an anode and a cathode, respectively. Then, thus injected holes and electrons are recombined in the emitting layer, and excitons are formed therein.
Implementation Method 2
an organic electroluminescence device (hereinafter, referred to as an organic EL device), holes and electrons are injected into an emitting layer from an anode and a cathode, respectively
Data Source
AI summary
A composition comprising a compound represented by the following formula (1) and a compound represented by the following formula (2), provided that the compound represented by the formula (1) and the compound represented by the formula (2) are different compounds: