Mixed Powder for OLED Deposition
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Solution Overview
Problem
The premix technique for forming organic electroluminescence devices faces challenges in maintaining consistent mixing proportions of components during the deposition process, leading to variability in film quality, especially over extended fabrication periods.
Innovation Solution
A mixed powder comprising a first compound with a fused ring structure having three or more rings and a second compound with a fused ring structure having 5 or more rings, where the second compound has more rings than the first, is used to maintain balanced vaporization and ensure stable component proportions during film formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a premix technique is used to simplify the deposition process, then device complexity is reduced, but manufacturing precision deteriorates due to variable mixing proportions in deposited films
Solution Approach 1:
The patent changes the physical-chemical parameters of the organic compounds by selecting specific fused ring structures with different ring counts (3-4 rings for first compound, 5+ rings for second compound). This structural parameter difference creates distinct vaporization characteristics that enable stable mixing proportions during co-deposition, resolving the contradiction between process simplicity and manufacturing precision.
Solution Approach 2:
The patent uses a composite approach by combining two different organic compounds with specific fused ring structures in a mixed powder formulation. This composite material design ensures that the compounds vaporize at different rates, maintaining consistent mixing proportions in the deposited film even when using a simplified single-source deposition process.
2Manufacturing precision
If co-deposition method is used to achieve stable mixing proportions, then manufacturing precision is improved, but device complexity increases due to multiple deposition sources
Solution Approach 1:
The patent extracts the mixing proportion control function from the deposition process itself and embeds it in the mixed powder formulation before deposition. By pre-configuring the compounds with specific fused ring structures that have different vaporization rates, the system eliminates the need for multiple deposition sources while maintaining precise mixing control.
Solution Approach 2:
The patent performs preliminary action by pre-selecting and combining compounds with specific fused ring structures in the mixed powder before deposition. This advance preparation of the material composition ensures stable vaporization behavior and consistent mixing proportions during the actual deposition process, eliminating the need for complex multi-source equipment.
3Ease of manufacture
If premix technique is used to reduce fabrication burden, then ease of manufacture is improved, but reliability deteriorates due to variable film quality over time
Solution Approach 1:
The patent changes the molecular structure parameters of the organic compounds by specifying fused ring structures with different ring counts. This structural modification creates inherent differences in vaporization rates that maintain stable mixing proportions throughout extended fabrication periods, ensuring consistent film quality and device reliability while using a simplified premix technique.
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 stabilizes the component proportions in the deposited film, reducing defective products and raw material loss, and enhances productivity by maintaining homogeneous mixing over time, even during continuous deposition processes.
Implementation Method 1
depositing a mixed powder by heating and vaporizing the mixed powder which comprises a first compound and a second compound, which is solid at ordinary temperatures and pressures
Implementation Method 2
a vacuum deposition method is generally used, and, a co-deposition method has been conventionally used to form a mixed layer composed of a plurality of components, in which each component is vaporized and simultaneously deposited
Data Source
AI summary
A mixed powder comprising a first compound and a second compound, wherein the first compound has the fused ring structure having the most rings and having three or more rings, in fused ring structures included therein, and the second compound has the fused ring structure having the most rings and having 5 or more rings, in fused ring structures included therein, and the fused ring structure having the most rings thereof has more rings than that of the first compound.