Light-Emitting Element Electrode Conductive Inclusion Resistance
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Solution Overview
Problem
In light-emitting elements with a layer containing a light-emitting organic compound between electrodes, high-resistance oxide films on electrodes increase driving voltage, leading to power consumption issues.
Innovation Solution
A structure where one electrode includes a first metal with a conductive inclusion, such as an oxide of a second metal, to reduce electrical resistance and prevent high-resistance oxide film formation, with a carrier-injection layer between the oxide and the light-emitting organic compound layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a metal electrode is used to reduce electrical resistance, then power consumption is reduced, but a high-resistance oxide film forms on the electrode surface increasing driving voltage
Solution Approach 1:
The electrode is segmented into multiple functional layers: a base metal layer for low electrical resistance, an intermediate layer to prevent oxidation, and a top conductive layer for electrical contact. This segmentation allows each layer to perform its specific function optimally.
Solution Approach 2:
The electrode uses composite material structure combining different metals and metal oxides. The base layer uses a metal with low oxidation tendency, while the top layer uses a conductive metal oxide or composite material that maintains both conductivity and resistance to oxidation.
2Loss of energy
If a conductive inclusion is added to the electrode, then electrical resistance is reduced, but the electrode structure becomes more complex
Solution Approach 1:
The conductive inclusion is nested within the electrode structure, with the inclusion embedded in the metal layer. This nested configuration allows the inclusion to reduce electrical resistance while being integrated into the overall electrode structure without requiring separate external components.
3Loss of energy
If the electrode surface is protected from oxidation, then electrical resistance is reduced, but the manufacturing process becomes more difficult
Solution Approach 1:
The anti-oxidation layer is formed preliminarily during the electrode fabrication process, before the electrode is assembled into the light-emitting element. This preliminary protection prevents oxidation during subsequent manufacturing steps and assembly, eliminating the need for additional oxidation prevention steps later.
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 configuration reduces electrical resistance loss, allowing for a light-emitting element with lower power consumption and improved efficiency in light emission.
Implementation Method 1
one electrode including a first metal, whose surface is provided with a conductive inclusion... reduces electrical resistance loss
Implementation Method 2
light emission can be obtained from the light-emitting organic compound when voltage is applied between the pair of electrodes
Data Source
AI summary
A light-emitting element, a light-emitting module, a light-emitting panel, or a light-emitting device in which loss due to electrical resistance is reduced is provided. The present invention focuses on a surface of an electrode containing a metal and on a layer containing a light-emitting organic compound. The layer containing a light-emitting organic compound is provided between one electrode including a first metal, whose surface is provided with a conductive inclusion, and the other electrode.