Vertical Organic Light-Emitting Transistor Coating for Uniform Nano-Carbon
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Solution Overview
Problem
In vertical organic light-emitting transistor devices, uneven distribution of the electrically conductive nano-carbon material leads to brightness inconsistencies across pixels, affecting display quality and reliability due to inadequate evenness of the electrically conductive layer formation.
Innovation Solution
A method involving the application of an organic material with a hydrocarbon group on a substrate, followed by a dispersion liquid containing a dispersant and carbon material, with subsequent drying and cleaning to ensure even distribution of the nano-carbon material, using specific chemical formulations and application methods to enhance adhesion and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a dispersion liquid containing nano-carbon material and dispersant is applied onto a substrate and subjected to drying and cleaning treatments, then an electrically conductive layer is formed, but the nano-carbon material is unevenly distributed on the substrate
Solution Approach 1:
An organic material layer containing a polymer with hydrocarbon groups is introduced as an intermediary between the substrate and the nano-carbon material. This intermediary layer improves the wettability and adhesion of the dispersion liquid to the substrate, enabling uniform distribution of the nano-carbon material throughout the electrically conductive layer, thereby resolving the brightness inconsistency issue
Solution Approach 2:
The chemical composition and surface properties of the intermediary layer are specifically designed with hydrocarbon groups to match the characteristics of the nano-carbon material and dispersant. By changing the chemical parameters of the intermediary layer, the patent achieves optimal compatibility and uniform distribution of the electrically conductive layer
2Ease of operation
If the electrically conductive layer is made thin with mostly void area for vertical organic light-emitting transistor operation, then transistor operation is enabled by gate electrode electric field, but uneven distribution of electrically conductive material is more likely to occur
Solution Approach 1:
The organic material layer with hydrocarbon groups serves as a mediator that ensures uniform distribution of nano-carbon material even in thin layers with high void content. This intermediary layer prevents aggregation and promotes even dispersion, enabling the thin conductive layer to maintain uniform electrical properties necessary for reliable transistor operation
Solution Approach 2:
The patent applies the intermediary layer selectively in regions where the electrically conductive layer will be formed, ensuring that the local chemical environment is optimized for uniform nano-carbon material distribution. This local optimization enables the thin conductive layer to achieve the required evenness for proper transistor operation
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 method achieves even fixation of the nano-carbon material across the substrate, improving brightness uniformity and display quality by ensuring consistent electric current distribution, thereby enhancing the reliability and performance of vertical organic light-emitting transistor devices.
Implementation Method 1
an organic material containing a polymer having a hydrocarbon group is applied onto the main surface of the substrate
Implementation Method 2
a dispersion liquid containing a dispersant and a carbon material is applied onto an organic material layer
Implementation Method 3
a cleaning fluid is applied to remove the dispersant
Data Source
AI summary
The method for producing a vertical organic light-emitting transistor device includes: a step (A) in which a substrate having a main surface, on which the vertical organic light-emitting transistor device is to be formed, is prepared; a step (B) in which an organic material containing a polymer having a hydrocarbon group is applied onto the main surface of the substrate; a step (C) in which a dispersion liquid containing a dispersant and a carbon material is applied onto an organic material layer formed in the step (B); a step (D) in which a coating film formed in the step (C) is dried; and a step (E) in which after the step (D) is performed, a cleaning fluid is applied to remove the dispersant.