Organic Light-Emitting Diode Layer Separation via Electrical Field
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Solution Overview
Problem
Conventional methods for producing organic light-emitting diodes face challenges in layer separation and solvent selection, leading to inefficiencies due to layer mixing and concentration fluctuations, which reduce the diode's efficiency.
Innovation Solution
The method involves applying a solution with differently charged organic emitter materials to a carrier under a static electrical field, allowing the materials to separate into distinct layers during drying, thereby creating a stack of unmixed emitter layers using a single solvent application step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If successive organic layers are applied using conventional liquid phase deposition, then the organic light-emitting diode can be produced, but layer mixing and concentration fluctuations occur which reduce manufacturing precision
Solution Approach 1:
The patent applies an electrical field parameter during the drying process to control the separation and distribution of emitter materials with different electrical charges. This parameter change enables precise layer separation without requiring multiple solvent applications, resolving the contradiction between manufacturing precision and ease of manufacture
Solution Approach 2:
The electrical field acts as an intermediary force that mediates the separation of emitter materials during the drying process. By introducing this intermediary, the patent achieves precise layer separation while using a single solvent application, eliminating the need for complex sequential layering processes
2Manufacturing precision
If multiple successive layers are applied to achieve precise layer separation, then manufacturing precision improves, but the number of processing steps increases which reduces productivity
Solution Approach 1:
The patent combines multiple layer formation operations into a single processing step by applying all emitter materials simultaneously in one solution and using an electrical field during drying to achieve automatic separation. This merging of operations maintains manufacturing precision while significantly improving productivity by reducing the number of processing steps
Solution Approach 2:
The patent replaces the mechanical process of sequential layer application with an electrical field-based separation mechanism. Instead of physically applying layers one by one, the system uses electrical forces to separate materials during a single drying process, thereby improving productivity without sacrificing layer separation quality
3Reliability
If emitter materials with different charges are separated using an electrical field, then internal quantum efficiency improves, but device complexity increases
Solution Approach 1:
The emitter materials themselves provide the separation mechanism through their inherent different electrical charges. When the electrical field is applied during drying, the materials automatically separate based on their charge properties without requiring additional complex separation equipment or processes. This self-service approach improves internal quantum efficiency while minimizing the increase in device complexity
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 enhances the internal quantum efficiency and out-coupling efficiency of the organic light-emitting diode by ensuring precise layer separation and reducing energy transfer between emitter materials, resulting in increased light output and simplified processing.
Implementation Method 1
an electrical field is applied, so that the solution is located in the electrical field
Implementation Method 2
the differently electrically charged emitter materials are accommodated separately from each other, or substantially separately from each other, each in a certain emitter layer of the organic stack
Implementation Method 3
The emitter materials are set up in such a way as to generate radiation via fluorescence or phosphorescence when the light-emitting diode is in operation
Implementation Method 4
The emitter materials are set up in such a way as to generate radiation via fluorescence or phosphorescence when the light-emitting diode is in operation
Data Source
AI summary
The invention relates to a method for producing an organic light-emitting diode (1) comprising the following steps: providing a carrier (3) for the organic light-emitting diode (1), applying a solution (S) comprising a plurality of different emitter materials (E) to the carrier (1), wherein said emitter materials (E) are each formed by a certain type of organic molecule and have electrical charges that differ from each other, applying an electrical field (F), so that the solution is located in the electrical field (F), and drying the solution (S) into a plurality of emitter layers (20) in an organic layer stack (2), while the electrical field is applied, so that the emitter materials (E) are accommodated separately from each other, each in a certain emitter layer (20) of the organic stack (2).