Organic Electronic Element with Host-Dopant Emission Layer
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Solution Overview
Problem
Current organic electric elements face challenges in achieving high luminous efficiency, color purity, and extended life span due to limitations in the stability and efficiency of their material layers, particularly in charge balance and thermal stability, which are crucial for large-scale portable displays.
Innovation Solution
The development of an organic electric element incorporating a compound represented by specific formulas for the emission-auxiliary and hole transport layers, and a compound for the light emitting layer, which enhance luminous efficiency, color purity, and life span by optimizing energy levels and material properties across the organic material layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a host/dopant system is used to enhance color purity and luminous efficiency, then luminous efficiency and color purity are improved, but the complexity of the organic material layer increases
Solution Approach 1:
The patent employs a host/dopant composite material system where a host material (e.g., mCP, TCTA) is combined with a dopant material (e.g., Ir(ppy)3, PtOEP) to create the light-emitting layer. This composite approach enables energy transfer from host to dopant, achieving high luminous efficiency and color purity while managing the complexity through systematic material selection and layer design.
2Power
If efficiency is increased to lower driving voltage, then driving voltage is reduced and life span increases, but achieving optimal efficiency requires complex optimization of multiple material properties
Solution Approach 1:
The patent systematically optimizes key parameters including HOMO/LUMO energy levels, triplet energy levels (T1), charge mobility, and interfacial properties of different material layers. By adjusting these parameters through selective material choice (e.g., using specific hole transport materials with appropriate energy levels), the invention achieves low driving voltage and extended life span while managing the optimization complexity through a structured approach to parameter matching across layers.
3Ease of manufacture
If the organic material layer is simplified to ease manufacturing, then ease of manufacture is improved, but luminous efficiency, color purity, and life span cannot be simultaneously maximized
Solution Approach 1:
The patent divides the organic material layer into multiple functional sub-layers including hole injection layer, hole transport layer, light-emitting layer, electron transport layer, and electron injection layer. Each sub-layer is optimized for its specific function with appropriate material selection, enabling simultaneous achievement of high luminous efficiency, color purity, and life span while maintaining manufacturing feasibility through modular layer structure.
4Duration of action of stationary object
If thermal stability is improved to prevent crystallization, then life span is extended, but achieving thermal stability requires careful selection of materials with specific energy levels and properties
Solution Approach 1:
The patent addresses thermal stability by selecting materials with appropriate triplet energy levels (T1), HOMO/LUMO energy levels, and molecular weight characteristics. The host material is chosen to have higher T1 energy than the dopant to prevent reverse energy transfer and crystallization. This systematic parameter-based material selection extends device life span by preventing thermal degradation while managing selection complexity through established design rules.
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 significantly improves driving voltage, luminous efficiency, and color purity while extending the life span of the organic electric element, addressing the limitations of existing materials by providing a stable and efficient organic material layer configuration.
Implementation Method 1
An organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy of an organic material
Implementation Method 2
excitons generated in the light emitting layer are transported to the dopant, thus emitting light with high efficiency
Data Source
AI summary
Disclosed is an organic electric element comprising a first electrode, a second electrode, and an organic material layer between the first electrode and the second electrode, wherein the organic material layer comprises the compound of Formula 1 and Formula 2 to improve driving voltage, luminous efficiency, color purity, and life span.