Organic Electric Element Capping Layer Surface Plasmon Polariton Loss Reduction
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Solution Overview
Problem
Current organic electric elements face challenges in achieving high luminous efficiency, heat resistance, and extended lifetime, particularly in large-area portable displays where efficient power consumption and color purity are crucial, due to limitations in the organic material layers and optical energy losses from surface plasmon polaritons.
Innovation Solution
Incorporating a capping layer with a specific compound on at least one surface of the electrodes opposite to the organic material layer, which enhances surface plasma resonance and reduces optical energy loss, thereby improving luminous efficiency and color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a metal electrode (such as Ag) is used to emit light, then electron emission is improved, but optical energy loss occurs due to surface plasmon polariton
Solution Approach 1:
The patent introduces an auxiliary layer between the metal electrode and the organic light-emitting layer. This auxiliary layer acts as an intermediary that prevents surface plasmon polariton formation while maintaining electron emission functionality. The auxiliary layer has specific optical properties that decouple the electron emission function from the harmful optical energy loss, allowing the metal electrode to emit electrons effectively without generating surface plasmons that would cause energy loss.
2Productivity
If the organic material layer is optimized for efficiency, then luminous efficiency increases, but thermal stability and lifetime are compromised due to Joule heating
Solution Approach 1:
The patent divides the organic material layer into multiple functional sub-layers, each optimized for specific functions. This segmentation allows different regions to handle different aspects of operation: some layers are optimized for high efficiency electron transport and light emission, while other layers are specifically designed for thermal management and stability. This functional division enables the system to achieve high luminous efficiency without compromising overall thermal stability and lifetime.
Solution Approach 2:
The patent introduces intermediate layers between the metal electrode and the organic light-emitting layer that serve as thermal management interfaces. These intermediate layers act as mediators that manage heat flow, preventing excessive Joule heating from reaching the organic materials while maintaining efficient electron transport. This allows the organic layer to operate at high efficiency without thermal degradation.
3Device complexity
If a single material is used as emitting material, then device structure is simplified, but color purity decreases due to emission quenching effect
Solution Approach 1:
The patent employs composite material structures within the organic light-emitting layer, combining multiple organic compounds with complementary properties. This composite approach enables the system to achieve high color purity through synergistic effects: different materials contribute different emission characteristics that, when combined, produce narrow emission bands and high color purity. The composite structure maintains reasonable device complexity by using a limited number of carefully selected materials with specific functions.
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 implementation of the capping layer with the specified compound leads to enhanced luminous efficiency, high heat resistance, and increased lifetime of the organic electric element by optimizing energy transfer and reducing surface plasmon polariton losses.
Implementation Method 1
In addition, in this situation, not only the challenge for efficient consumption power but also challenges for luminous efficiency and lifetime must be solved. Recently, technology for improving color purity and increasing efficiency by optimized optical thickness between an anode and a cathode in a top device with a resonance structure as well as research on improving device characteristics by giving performance changes of each material may be one of the important factors to improve the device performance.
Implementation Method 2
Compared with the bottom device structure of the non-resonant structure, the top device structure has a large optical energy loss due to surface plasmon polariton (SPP) because the formed light is reflected by the anode, which is a reflective film, and emitted toward the cathode.
Data Source
AI summary
The present disclosure relates to an organic electric element for realizing high luminous efficiency, and high heat resistance of the element, improve the color purity of the element, and increase the lifetime of the element.