Five-membered Hetero Ring Compound for OLED Efficiency
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Solution Overview
Problem
Current organic electrical elements face issues with luminous efficiency, stability, and color purity due to the limitations of existing materials used in their organic material layers, particularly in hole injection, transport, and light emitting layers.
Innovation Solution
A compound with two or more five-membered hetero rings is developed, which can function as a hole injection material, hole transport material, light emitting material, or electron transport material, enhancing efficiency and color purity, and is applicable in both fluorescent and phosphorescent elements across various colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a host/dopant system is used to enhance color purity and luminous efficiency, then color purity and luminous efficiency are improved, but the maximum luminescence wavelength shifts to a longer wavelength
Solution Approach 1:
The patent modifies the chemical structure of dopant materials by introducing specific five-membered hetero rings with particular substituents (R1-R6 groups), which changes the energy band gap parameters to achieve desired wavelength emission while maintaining color purity through the host/dopant energy transfer mechanism
Solution Approach 2:
The patent employs composite host/dopant material systems where the host material provides the base structure and the dopant material (with specific five-membered hetero ring structure) provides the desired emission characteristics, combining the advantages of both materials to achieve high color purity and appropriate wavelength
2Reliability
If multiple layers with different materials are used to improve efficiency and stability, then efficiency and stability are improved, but the device complexity increases
Solution Approach 1:
The five-membered hetero ring compound is designed to perform multiple functions simultaneously - it can serve as a hole injection material, hole transport material, light emitting material, or electron transport material depending on the specific embodiment, reducing the need for multiple specialized layers
Solution Approach 2:
By modifying the chemical structure parameters of the organic material (introducing specific five-membered hetero ring structures with various substituents), the patent achieves improved efficiency and stability within single or reduced-number layers, thereby reducing structural complexity
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 significantly improves the luminous efficiency, stability, and lifespan of organic electrical elements by reducing driving voltage and maintaining high color purity across different color emissions.
Implementation Method 1
excitons generated in the light emitting layer are transported to the dopant, thus emitting light with high efficiency
Implementation Method 2
a fluorescent material derived from electronic excited singlet states
Implementation Method 3
a phosphorescent material derived from electronic excited triplet states
Data Source
AI summary
A compound having a five-membered hetero ring, an organic electrical element using the same and a terminal thereof. An organic electric element includes a first electrode, a second electrode, and an organic material layer between the first electrode and the second electrode. The organic material layer includes the compound. When the organic electric element includes the compound in an organic material layer, luminous efficiency, stability, and life span can be improved.