OLED Electron Blocking Layer Compound Formula 1
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Solution Overview
Problem
Existing organic electroluminescent devices face challenges in achieving high luminous efficiency and long lifespan, particularly in the use of specific combinations of compounds as an electron blocking layer and host material for the light-emitting layer.
Innovation Solution
An organic electroluminescent device is designed with a first electrode, a second electrode, a light-emitting layer between the electrodes, and at least one electron blocking layer between the first electrode and the light-emitting layer. The electron blocking layer comprises a compound represented by Formula 1, and the light-emitting layer includes at least two kinds of compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional phosphorescent materials are used in OLEDs, then luminous efficiency is improved, but device lifespan and stability deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the electron blocking layer by introducing specific compounds with Formula 1 containing nitrogen-containing heterocyclic groups and diphenylamine structures. This parameter change in material composition improves both luminous efficiency and device lifespan simultaneously, resolving the contradiction between efficiency and reliability
Solution Approach 2:
The patent uses composite material strategy by combining the novel electron blocking layer compound (Formula 1) with specific host materials (Formula 2 or 3) and phosphorescent dopants. This composite approach creates synergistic effects that enhance both luminous efficiency and operational stability, addressing the contradiction between efficiency improvement and lifespan deterioration
2Device complexity
If existing compound combinations are used in electron blocking layer and light-emitting layer, then device structure is simple, but luminous efficiency and lifespan are insufficient
Solution Approach 1:
The patent applies local quality principle by optimizing the electron blocking layer with a specifically designed compound (Formula 1) that has localized electron-blocking functionality. This targeted local optimization in the electron blocking layer, while maintaining simplicity elsewhere in the device structure, achieves high luminous efficiency without significantly increasing overall device complexity
3Device complexity
If existing compound combinations are used in electron blocking layer and light-emitting layer, then device structure is simple, but lifespan characteristics deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the electron blocking layer compound to include specific structural features (nitrogen-containing heterocyclic groups, diphenylamine structures) that enhance device lifespan. This parameter optimization achieves long lifespan characteristics while maintaining relatively simple device structure
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 proposed solution enables the creation of organic electroluminescent devices with high luminous efficiency and long lifespan characteristics, effectively addressing the limitations of existing technologies.
Implementation Method 1
Organic electroluminescent device and organic electroluminescent compound for the same
Data Source
AI summary
The present disclosure relates to an organic electroluminescent device. By comprising a compound and/or an organic electroluminescent material according to the present disclosure, an organic electroluminescent device exhibiting higher luminous efficiency and/or longer lifespan characteristics compared to conventional organic electroluminescent devices can be provided.