Acid-Treated OLED Substrate Bonding for Flexible Devices
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Solution Overview
Problem
The manufacturing of flexible OLED devices faces challenges due to stress-induced degradation of molecular chains and poor bonding capacity between film layers, particularly when substrates are bent, leading to performance issues.
Innovation Solution
A method involving acid treatment of substrates and cover plates with dilute acids, followed by lamination, to enhance bonding between layers by forming hydrogen bonds between oxygen atoms in the liquid light emitting layer and hydrogen ions on the surface, using materials like PEDOT:PSS for the buffer layer and titanium dioxide for the electron transport layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If physical bonding method is used to bond liquid light emitting layer with substrate and cover plate, then manufacturing process is simplified, but bonding capacity between organic layers deteriorates
Solution Approach 1:
The patent introduces plasma treatment as a surface modification process that changes the chemical parameters of the substrate and cover plate surfaces. This treatment creates reactive functional groups and increases surface energy, enabling strong chemical bonding between the liquid light emitting layer and the substrate/cover plate, thereby resolving the contradiction between manufacturing simplicity and bonding capacity.
Solution Approach 2:
The patent uses plasma as an intermediary treatment between the substrate/cover plate and the liquid light emitting layer. This plasma treatment layer acts as a mediator that enhances adhesion by creating a chemically active interface, allowing the liquid light emitting material to bond effectively without complex manufacturing processes.
2Adaptability or versatility
If substrate is bent in flexible OLED device, then device flexibility is achieved, but molecular chains fracture and device performance degrades
Solution Approach 1:
The patent employs plasma treatment to modify the mechanical and chemical parameters of the film layer interfaces. This creates a more resilient bonding interface that can withstand the stress of bending without causing molecular chain fracture, thus maintaining device performance while achieving flexibility.
Solution Approach 2:
The patent creates a composite structure through plasma-treated interfaces between the substrate, liquid light emitting layer, and cover plate. This composite bonding approach enhances the overall mechanical strength and flexibility of the device, allowing it to bend without degrading performance.
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 improves the bonding capacity and electron transport, stabilizes device performance, and enhances light emitting efficiency by effectively anchoring the liquid light emitting layer to the substrate and cover plate, creating a robust carrier transporting channel.
Implementation Method 1
the substrate is treated with an acid after the buffer layer is manufactured thereon, and a layer of H+ is attached on a surface of the substrate
Implementation Method 2
Oxygen atoms in the liquid light emitting layer are bonded to H+ on a surface of the buffer layer under an action of a hydrogen bond
Implementation Method 3
during the acid treatment process, the acid solution is heated, so as to accelerate attachment
Data Source
AI summary
Disclosed is a method for manufacturing an OLED device. The method includes steps of: providing a substrate and manufacturing an anode and a buffer layer in sequence on the substrate; subjecting the substrate to an acid treatment; drying the substrate and manufacturing a liquid light emitting layer on the buffer layer; providing a cover plate and manufacturing a cathode and an electron transport layer in sequence on the cover plate; subjecting the cover plate to the acid treatment; and bonding the cover plate and the substrate together by lamination to obtain an OLED device. According to the method, performance of a device can be improved stably, and thus light emitting efficiency of the device can be enhanced.