Dual-Layer Light-Emitting Electrode for Oxidation Resistance
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Solution Overview
Problem
The first electrode in light-emitting elements is susceptible to oxidation at the interface with the oxide-containing carrier transport layer, leading to reduced luminous efficiency.
Innovation Solution
Incorporating a first electrode with a dual-layer structure where the second metal element is more susceptible to oxidation than the first, forming an alloy or mixture with the first metal element, thereby protecting the first electrode from oxidation and maintaining carrier transport efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an oxide-containing carrier transport layer is used between the first electrode and the light-emitting layer, then carrier transport is improved, but the first electrode becomes susceptible to oxidation at the interface
Solution Approach 1:
The patent introduces a second metal element layer as an intermediary between the oxide-containing carrier transport layer and the first metal element layer. This intermediate layer acts as a protective barrier that prevents direct contact between oxygen from the oxide layer and the first metal element, thereby eliminating the oxidation problem while maintaining the carrier transport function of the oxide-containing layer.
Solution Approach 2:
The first electrode is divided into multiple layers: a first metal element layer adjacent to the oxide-containing carrier transport layer, and a second metal element layer positioned between the first metal element layer and the oxide layer. This segmentation allows each layer to perform its specific function - the first layer maintains electrical contact while the second layer provides oxidation protection.
2Reliability
If the first electrode is protected from oxidation using a dual-layer structure with a second metal element, then luminous efficiency is improved, but device complexity increases
Solution Approach 1:
The patent optimizes the thickness parameters of each layer in the dual-layer electrode structure. By carefully controlling the thickness of the first metal element layer and the second metal element layer, the patent achieves effective oxidation protection while maintaining good electrical contact and minimizing the impact on device performance. This parameter optimization reduces the practical complexity of implementing the dual-layer structure.
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 enhances luminous efficiency by reducing oxidation of the first electrode, ensuring stable carrier transport and improved light extraction.
Implementation Method 1
the second metal element is more susceptible to oxidation than the first metal element
Data Source
AI summary
A light-emitting element includes a first electrode, a second electrode, a light-emitting layer between the first electrode and the second electrode, and an intervening layer between the first electrode and the light-emitting layer, the intervening layer containing an oxide. The first electrode includes: a first layer adjacent to the intervening layer, the first layer containing atoms of a first metal element; and a second layer containing atoms of a second metal element, the first layer and the second layer are stacked in a stated order when viewed from the light-emitting layer, and the second metal element is more susceptible to oxidation than the first metal element.