OLED Al-Based Reflective Film Prevents Galvanic Corrosion
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Solution Overview
Problem
Existing OLEDs face issues with galvanic corrosion between different metal electrodes, leading to non-uniform brightness and poor image quality due to potential differences, which affects their thermal stability and durability.
Innovation Solution
An OLED structure featuring an aluminum (Al)-based reflective film with nickel (Ni) and a rare earth metal, along with a Ni rich oxide layer and a transparent conductive film, which prevents galvanic corrosion by forming an ohmic contact and enhancing thermal stability and light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different metal electrodes are used in OLED, then electrical conductivity is improved, but galvanic corrosion occurs leading to non-uniform brightness and poor image quality
Solution Approach 1:
An aluminum-based reflective film is introduced as an intermediary layer between different metal electrodes to prevent direct contact and eliminate galvanic corrosion. The reflective film acts as a physical barrier that stops electrochemical reactions while maintaining electrical functionality, thereby preventing non-uniform brightness and image quality degradation.
Solution Approach 2:
The aluminum-based reflective film is formulated as a composite material containing aluminum as the primary component with specific compositional characteristics. This composite structure provides both the electrical conductivity needed for electrode functionality and the corrosion resistance required to prevent galvanic reactions between dissimilar metals.
2Reliability
If multiple metal layers are added to prevent galvanic corrosion, then durability is improved, but device complexity increases
Solution Approach 1:
The aluminum-based reflective film serves multiple functions simultaneously: it acts as an electrode, provides a barrier against galvanic corrosion, maintains electrical conductivity, and contributes to the overall device durability. By consolidating these functions into a single multi-functional layer, the design avoids adding separate protective layers that would increase structural 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
The solution ensures high image quality and durability by preventing galvanic corrosion, maintaining uniform brightness and thermal stability, and improving light efficiency through the use of an Al-based reflective film with specific intermetallic phases and rare earth metals.
Implementation Method 1
prevents galvanic corrosion by forming an ohmic contact
Implementation Method 2
forming an ohmic contact
Implementation Method 3
The holes and electrons are recombined with each other in the EML and excitons are generated. A state of the excitons is changed from an excited state to a ground state and thus light is emitted.
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
According to the present invention, an organic light emitting diode (OLED) includes a substrate; a first electrode formed on the substrate; a second electrode disposed on the first electrode; and an organic layer interposed between the first electrode and the second electrode. The first electrode comprises an aluminum (Al)-based reflective film including nickel (Ni) and at least one rare earth metal selected from the group consisting of lanthanum (La), cerium (Ce), praseodymium (Pr), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm) and lutetium (Lu); and a transparent conductive film interposed between the Al-based reflective film (5a) and the organic layer.