OLED Electron Transport Layer Carbon Nanotube Dispersion
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Solution Overview
Problem
The existing methods for forming carbon nanotube composite structures for use as electron transport layers in OLEDs suffer from poor dispersion of carbon nanotubes, leading to inadequate electron transport capabilities due to non-uniform distribution and high viscosity of melted polymers.
Innovation Solution
A method involving the placement of carbon nanotubes on a substrate, coating with a monomer solution, polymerization, and subsequent removal to create a uniformly dispersed carbon nanotube composite structure, where the carbon nanotubes are either parallel or randomly arranged, enhancing their dispersion and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If carbon nanotubes are dispersed in organic solvent to form carbon nanotube dispersion and mixed with monomer solution, then the carbon nanotube composite structure can be formed, but the carbon nanotubes have poor dispersion in the organic solvent which affects the uniformity of the carbon nanotubes in the composite structure
Solution Approach 1:
The patent changes the physical state parameter of the polymer from solid to liquid by melting it, creating a molten polymer medium with different flow and dispersion characteristics compared to organic solvents. This parameter change enables better carbon nanotube dispersion and uniform distribution in the composite structure.
Solution Approach 2:
The patent creates a composite material system consisting of carbon nanotubes and polymer matrix. By carefully selecting and combining these two materials with complementary properties, the patent achieves improved dispersion and uniformity of carbon nanotubes within the polymer composite structure.
2Quantity of substance
If the polymer is completely melted and mixed with carbon nanotubes, then the carbon nanotube composite structure can be formed, but the carbon nanotubes have poor dispersion in the melted polymer because the melted polymer has greater viscosity
Solution Approach 1:
The patent applies preliminary action by first dispersing carbon nanotubes in a suitable medium before combining with the polymer matrix. This pre-dispersion step ensures uniform distribution of carbon nanotubes before the final composite formation, overcoming the viscosity-related dispersion problems in melted polymer.
Solution Approach 2:
The patent uses an intermediary substance or processing medium to facilitate the dispersion of carbon nanotubes. This intermediary helps bridge the compatibility gap between carbon nanotubes and polymer matrix, enabling uniform distribution even when the polymer is in a molten state with high viscosity.
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 approach results in improved uniformity and mechanical strength of the carbon nanotube composite structure, thereby enhancing the electron transport layer's ability to transmit electrons effectively.
Implementation Method 1
coating with a monomer solution, polymerization
Data Source
AI summary
An organic light emitting diode includes a support body, an anode electrode, a hole transport layer, an organic light emitting layer, an electron transport layer, and a cathode electrode stacked on each other in that order. The electron transport layer includes a polymer and a plurality of carbon nanotubes dispersed in the polymer, the polymer has a first surface and a second surface opposite to the first surface, and a length direction of the plurality of carbon nanotubes extends from the first surface to the second surface.