OLED Pixel Defining Layer Metal Nanoparticles Light Extraction
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Solution Overview
Problem
Current OLED devices face significant energy loss and low external quantum efficiency due to waveguide mode loss, total reflection, and surface plasmon loss, with existing methods to improve luminous efficiency being complex and potentially causing color-shift and narrower viewing angles.
Innovation Solution
Incorporating metal nanoparticles into the pixel defining layer (PDL) of OLED devices, which can form an independent core-shell structure with an isolation layer, enhancing localized surface plasmon resonance to improve internal and external quantum efficiency without altering the luminescent spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If photonic crystals or micro-lens arrays are adhered onto the glass substrate to reduce total reflection, then light extraction efficiency is improved, but the manufacturing process becomes complex and difficult
Solution Approach 1:
The patent extracts the light management function from the substrate layer and relocates it to the pixel defining layer (PDL). By incorporating metal nanoparticles into the PDL, the device utilizes localized surface plasmon resonance to enhance light extraction without requiring complex photonic crystals or micro-lens arrays on the substrate, thereby simplifying the manufacturing process while maintaining improved light extraction efficiency.
Solution Approach 2:
The patent introduces metal nanoparticles as an intermediary element within the PDL to mediate between the organic emission layer and the substrate. These nanoparticles serve as a bridge that enhances light extraction through localized surface plasmon resonance, avoiding the need for direct coupling between the substrate and complex optical structures.
2Loss of energy
If nano photo printing technology is used to form periodic or quasi-periodic microstructure pattern on cathode, then waveguide mode loss is reduced, but the manufacturing process becomes complex
Solution Approach 1:
The patent extracts the waveguide mode loss mitigation function from the cathode layer and transfers it to the PDL. By placing metal nanoparticles in the PDL, the device achieves reduced waveguide mode loss through localized surface plasmon resonance without requiring nano photo printing processes on the cathode, thereby simplifying manufacturing.
Solution Approach 2:
The patent replaces the mechanical nano photo printing process with a chemical/solution-based approach. Metal nanoparticles are incorporated into the PDL through solution processing or deposition techniques, substituting the complex mechanical nano printing process with a more manufacturable method while achieving the same optical function.
3Loss of energy
If optical micro-cavity structure is utilized to improve luminous efficiency, then light extraction is enhanced, but color-shift and narrower viewing angle problems occur
Solution Approach 1:
The patent applies local quality enhancement by introducing metal nanoparticles with specific plasmonic properties into the PDL. These nanoparticles create localized electromagnetic field enhancement that improves light extraction efficiency without imposing the global optical constraints of micro-cavity structures, thereby maintaining broad viewing angles and color stability.
Solution Approach 2:
The patent changes the physical parameters of the light extraction mechanism by utilizing localized surface plasmon resonance of metal nanoparticles instead of the resonant cavity modes of optical micro-cavities. This parameter change allows for improved luminous efficiency while avoiding the color-shift and viewing angle limitations inherent to micro-cavity designs.
4Loss of energy
If metal nanoparticles are added to enhance localized surface plasmon resonance, then internal and external quantum efficiency are improved, but device structure becomes more complex
Solution Approach 1:
The patent merges the light extraction enhancement function with the existing PDL structure by incorporating metal nanoparticles into it. This integration approach allows the PDL to simultaneously perform its original pixel definition function and the new light management function, avoiding additional separate structures and minimizing device complexity.
Solution Approach 2:
The patent makes the PDL multi-functional by enabling it to serve both as a pixel defining structure and as a light management layer containing metal nanoparticles. This universal design allows a single layer to perform multiple functions, reducing the need for additional components and maintaining structural simplicity while improving quantum efficiency.
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 use of metal nanoparticles in the PDL significantly enhances light scattering and absorption, improving both internal and external quantum efficiencies while maintaining the original color of the OLED device, thus increasing luminous efficiency without the drawbacks of previous methods.
Implementation Method 1
Incorporating metal nanoparticles into the pixel defining layer (PDL) of OLED devices, which can form an independent core-shell structure with an isolation layer, enhancing localized surface plasmon resonance to improve internal and external quantum efficiency
Data Source
AI summary
The embodiment of the present invention relates to an organic light-emitting diode (OLED) device, which comprises a pixel define layer (PDL) and a light-emitting structure. Metal nanoparticles are doped in the PDL. The OLED device improves the luminous efficiency. The embodiment of the present invention further provides a method for manufacturing the OLED device.