Organic EL Device Production Ammonia Exposure Control
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Solution Overview
Problem
The existing production methods for organic electroluminescent (EL) devices do not adequately ensure sufficient luminance life.
Innovation Solution
A production method for organic EL devices that involves controlling the average concentration of ammonia exposure and exposure time during the formation of organic functional layers and sealing layers, using specific formulas to optimize the product of concentration and time, and employing a process that includes film formation, drying, holding, calcination, and cooling stages under controlled conditions to form layers with organic functional materials and solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional production methods are used with standard ammonia exposure control, then the production process is simple, but the luminance life of the organic EL device is insufficient
Solution Approach 1:
The patent applies parameter changes by establishing a quantitative relationship between ammonia concentration and exposure time through the formula A×B≤105. This transforms the production control from qualitative to quantitative, allowing optimization of luminance life through precise parameter management while maintaining process simplicity.
Solution Approach 2:
The patent implements preliminary action by controlling ammonia exposure parameters during the organic layer formation process before device completion. By pre-establishing the ammonia concentration-time product limit, the method prevents degradation of the organic layer, thereby extending luminance life without requiring complex post-processing.
2Reliability
If ammonia exposure is not controlled during organic layer formation, then the production process is simple and fast, but the organic layer quality deteriorates leading to short device life
Solution Approach 1:
The patent transforms manufacturing control by introducing a specific parameter threshold (A×B≤105) that balances ease of manufacture with device reliability. This single parameter control mechanism ensures organic layer quality and device reliability without requiring complex multi-parameter optimization, maintaining manufacturing simplicity.
Solution Approach 2:
The patent implements feedback control by establishing a measurable criterion (ammonia concentration-time product) that can be monitored and adjusted during production. This feedback mechanism ensures that the organic layer formation process maintains optimal conditions for device reliability while preserving manufacturing ease through straightforward parameter monitoring.
Data Source
AI summary
A method for producing an organic EL device having an anode, a cathode, at least one organic functional layer disposed between the anode and the cathode, and a sealing layer, comprisinga step of forming the anode, a step of forming the cathode, a step of forming the at least one organic functional layer and a step of forming the sealing layer,wherein the average concentration: A (ppm) of ammonia to which the organic EL device during production is exposed from initiation time of the step of forming the at least one organic functional layer until termination time of the step of forming the sealing layer and the exposure time thereof: B (sec) satisfy the formula (1-1):0≤A×B≤105 (1-1).