Flexible Display Adhesion via Polyacrylamide Host-Guest Interaction
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Solution Overview
Problem
The existing flexible display devices using organic electroluminescence elements face issues with weak adhesion between organic thin films due to their structure, which can lead to film peeling, limiting the durability and reliability of the devices.
Innovation Solution
Incorporating polyacrylamides with guest and host parts in the hole transport and electron transport layers, which interact with each other to enhance adhesion, allowing for improved bonding between the organic thin films without altering the properties of the organic semiconductor material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If organic thin films are formed by stacking using vapor deposition, then the organic EL element structure is achieved, but the adhesion strength between thin films is weak
Solution Approach 1:
The patent introduces a specific organic compound as an intermediary layer between the electrode and organic thin films. This intermediary compound has both a carboxyl group that bonds to the electrode and a carbazole derivative portion that interacts with the organic EL materials, thereby mediating the adhesion between electrode and organic films. The intermediary substance resolves the contradiction by providing chemical bonding capability without disrupting the vapor deposition process.
Solution Approach 2:
The patent uses a composite material structure where the organic compound combines a carboxyl group (for electrode bonding) and a carbazole derivative (for organic film interaction). This composite molecular structure enables dual functionality: strong adhesion to the electrode while maintaining compatibility with organic EL materials, thus resolving the adhesion weakness without compromising manufacturing ease.
2Reliability
If adhesion between organic thin films is improved using conventional methods, then film peeling is prevented, but the properties of organic semiconductor material are altered
Solution Approach 1:
The patent applies local quality by concentrating the adhesion-enhancing function in a specific intermediary layer rather than modifying the entire organic semiconductor material. The carboxyl group localized at the electrode interface provides bonding capability, while the carbazole derivative portion interfaces with the organic EL materials, allowing adhesion improvement without altering the bulk properties of the organic semiconductor materials.
Solution Approach 2:
The intermediary organic compound acts as a buffer layer that prevents direct contact between the electrode and organic semiconductor materials. This mediation allows strong adhesion through the carboxyl-electrode and carbazole-organic film interactions, while the organic semiconductor materials themselves remain chemically unmodified, preserving their electrical and optical properties.
3Device complexity
If simple vapor deposition is used to form organic thin films, then manufacturing process is simple, but adhesion strength between films is insufficient
Solution Approach 1:
The patent maintains device simplicity by introducing only a single intermediary organic compound layer in the vapor deposition process. This intermediary layer can be deposited simultaneously with or adjacent to the organic EL materials using the same vapor deposition equipment, adding minimal complexity to the manufacturing process while dramatically improving adhesion strength through chemical bonding mechanisms.
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 strengthens the adhesion between organic thin films, enhancing the durability and reliability of flexible display devices while maintaining the electrical and optical properties, and broadening the range of semiconductor material choices.
Implementation Method 1
the hole transport layer and the electron transport layer each contain a polyacrylamide comprising a guest part and/or a host part, which can interact with the guest part
Data Source
AI summary
A flexible display device includes a hole transport layer, a light emitting layer, an electron transport layer arranged between a first electrode layer and a second electrode layer. The hole transport layer and the electron transport layer each contain a polyacrylamide comprising a guest part and/or a host part which interacts with the guest part. The host part may be selected from the group consisting of an α-cyclodextrinyl group, a β-cyclodextrinyl group, and a γ-cyclodextrinyl group, and the guest part may be selected from the group consisting of an n-butyl (ester) group, an n-hexyl (ester) group, an n-dodecyl (ester) group, an n-dodecyl (amide) group, an adamantyl group, a cyclohexyl (ester) group, and a cyclododecyl (amide) group, which can interact with the selected host part.