OLED Electrode Dry Cleaning for Residue-Free Hole Injection
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Solution Overview
Problem
Existing display apparatuses face challenges in extending the life of light-emitting devices, particularly due to organic residues that can contaminate the electrodes and reduce the efficiency and lifespan of the organic light-emitting diodes (OLEDs).
Innovation Solution
A method of manufacturing a display apparatus that involves forming a first electrode on a substrate, creating a pixel-defining layer with openings exposing the electrode, and performing dry cleaning using oxygen gas to form an indium-fluorine bond on the electrode surface, thereby removing organic residues and improving the electrode's work function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic residues are present on the electrode surface, then the manufacturing process is simpler, but the lifespan and performance of the OLED is reduced
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition of the cleaning plasma through oxygen gas introduction, changing the reactive species and etch chemistry to selectively remove organic residues without damaging the electrode. This transforms the cleaning process from a simple physical removal to a controlled chemical reaction that achieves both thorough cleaning and material protection.
Solution Approach 2:
The patent uses oxygen plasma as a strong oxidizing environment to accelerate the oxidation and removal of organic residues from the electrode surface. The oxygen radicals in the plasma efficiently oxidize carbon-based contaminants, converting them to volatile compounds that can be removed, thereby extending OLED lifespan without requiring complex mechanical cleaning steps.
2Reliability
If dry cleaning is performed to remove organic residues, then the OLED lifespan is extended, but the manufacturing time increases
Solution Approach 1:
The patent employs periodic action by using pulsed plasma treatment with controlled duty cycles, where the plasma is activated in intervals to remove organic residues efficiently. This periodic activation allows sufficient cleaning time while maintaining overall manufacturing speed, achieving a balance between OLED lifespan extension and production throughput.
Solution Approach 2:
The patent optimizes manufacturing speed by adjusting plasma treatment parameters such as power, pressure, and gas flow rate to achieve effective cleaning in reduced time. By changing these parameters, the cleaning process is accelerated while maintaining the quality needed to extend OLED lifespan, thus improving productivity without sacrificing reliability.
3Reliability
If indium-fluorine bonds are formed on the electrode surface, then hole injection characteristics are improved, but the manufacturing process complexity increases
Solution Approach 1:
The patent extracts the essential function of surface treatment by introducing fluorine atoms through oxygen plasma, which react with indium atoms on the electrode surface to form indium-fluorine bonds. This extraction approach achieves the desired hole injection improvement through a single integrated plasma treatment step rather than multiple separate surface modification processes, thereby reducing overall process complexity while maintaining enhanced 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
The proposed method effectively extends the life of the light-emitting devices by removing organic residues and forming an indium-fluorine bond, which enhances the hole injection characteristics and improves the overall performance and lifespan of the OLEDs.
Implementation Method 1
performing a first dry cleaning on a surface of the at least part of the first electrode that is exposed through the opening. An indium-fluorine bond may be formed on the surface of the at least part of the first electrode through the first dry cleaning. The performing of the first dry cleaning may include removing an organic residue from the surface of the at least part of the first electrode.
Implementation Method 2
An indium-fluorine bond may be formed on the surface of the at least part of the first electrode through the first dry cleaning.
Data Source
AI summary
A method of manufacturing a display apparatus includes forming a first electrode on a substrate, forming a pixel-defining layer on the first electrode, the pixel-defining layer including an opening through which at least part of the first electrode is exposed, and performing a first dry cleaning on a surface of the at least part of the first electrode that is exposed through the opening. An indium-fluorine bond is formed on the surface of the at least part of the first electrode through the first dry cleaning.