Organic Light Emitting Device Contact Hole Design
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Solution Overview
Problem
Conventional light emitting devices experience peeling phenomena and increased interfacial resistance due to narrow contact areas between the contact parts and electrodes, leading to inefficiencies in energy transfer and potential device failure.
Innovation Solution
The design includes an insulating layer with openings and contact holes that expose the entire upper surface of the contact parts, allowing for a broader contact area between the electrodes and reducing interfacial resistance, thereby preventing peeling and enhancing energy transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the contact hole is formed to expose only a portion of the contact part, then the insulating layer structure is simpler, but the contacting area between contact part and electrode becomes narrow
Solution Approach 1:
The contact hole is designed to expose not only the upper surface but also the side surface of the contact part, transitioning from a single-dimensional exposure to a multi-dimensional exposure. This increases the contacting area between the electrode and contact part without adding complex insulating layer structures.
2Ease of manufacture
If the contact hole exposes only a portion of the contact part, then the manufacturing process is simpler, but interfacial resistance increases
Solution Approach 1:
By forming the contact hole to expose the side surface of the contact part in addition to the upper surface, the contacting area is increased without complicating the manufacturing process. This multi-dimensional exposure approach reduces interfacial resistance while maintaining manufacturing simplicity.
3Ease of manufacture
If the contact area is narrow, then the insulating layer can be formed more easily, but peeling phenomenon occurs
Solution Approach 1:
The contact hole configuration exposes the side surface of the contact part, increasing the contact area between the electrode and contact part. This enhanced contact area improves adhesion and prevents peeling of the insulating layer without complicating the insulating layer formation process.
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 interfacial resistance and prevents peeling, resulting in lower driving voltage requirements and improved energy transfer efficiency in the light emitting device.
Implementation Method 1
Holes from the anode and electrons from the cathode are combined within the organic light emitting layer to create hole-electron pairs, i.e., excitons. The organic light emitting device emits lights by energy generated while the excitons return to ground state.
Data Source
AI summary
This document discloses an organic light emitting device comprising a first electrode and a wire comprising a contact part formed on a substrate, an insulating layer formed on the first electrode and a portion of the wire, the insulating layer comprising an opening which exposes a portion of the first electrode and a contact hole which exposes an entire upper surface of the contact part, an emission layer formed in the opening, a second electrode formed on the emission layer and the upper surface of the contact part though the contact hole.