Organic Electric Element Charge Generating Layer Optimization
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Solution Overview
Problem
Conventional organic electric elements used in portable display devices face challenges in achieving high light emission efficiency and long lifespan, particularly due to limitations in the organic materials used, which affect their driving voltage and overall performance.
Innovation Solution
The organic electric element comprises a first electrode, a second electrode, and an organic layer with a charge generating layer positioned between two stacks, where the charge generating layer includes specific compounds represented by chemical formulas, enhancing light emission efficiency and lifespan by optimizing the energy levels of the molecular orbitals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic materials are used in organic electric elements, then the device structure can be maintained, but the light emission efficiency and lifespan are insufficient
Solution Approach 1:
The patent applies parameter changes by carefully selecting organic materials with specific HOMO and LUMO energy levels. The first organic material in the charge generating layer has a HOMO level of 5.8-6.5 eV and LUMO level of 2.0-3.0 eV, while the second organic material has a HOMO level of 5.5-6.2 eV and LUMO level of 2.2-3.2 eV. This precise parameter optimization enables efficient charge generation and transport, simultaneously improving light emission efficiency and device lifespan without requiring structural modifications
Solution Approach 2:
The patent employs composite materials by combining two different organic materials in the charge generating layer. The first organic material (e.g., NPD, TCTA) and second organic material (e.g., Alq3, Bphen) work synergistically to achieve both high light emission efficiency and long lifespan. This composite approach allows the device to benefit from the complementary properties of different materials, resolving the contradiction between efficiency and reliability
2Reliability
If the organic layer structure is optimized for better performance, then efficiency and lifespan improve, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the charge generating layer into two distinct sub-layers, each with specific functional requirements. The first sub-layer uses materials with specific energy level ranges (HOMO: 5.8-6.5 eV, LUMO: 2.0-3.0 eV), while the second sub-layer uses materials with different energy levels (HOMO: 5.5-6.2 eV, LUMO: 2.2-3.2 eV). This segmentation allows independent optimization of each layer's properties, achieving high reliability while maintaining manageable structural complexity through systematic design
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
This configuration results in improved luminous efficiency and extended lifetime of the organic electric element, effectively addressing the limitations of existing technologies by optimizing the energy levels and material combinations within the organic layer.
Implementation Method 1
An organic light emitting phenomenon refers to the phenomenon of converting electrical energy into light energy by means of an organic material
Implementation Method 2
a charge generating layer positioned between the first stack and the second stack... enhancing light emission efficiency and lifespan by optimizing the energy levels of the molecular orbitals
Data Source
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AI summary
Provided are an organic electric element, a display panel and a display device including the organic electric element which include a charge generating layer including a first layer comprising a first compound and a second compound and a second layer comprising a third compound so that they may have excellent efficiency or lifespan.