OLED Emissive-Transport Layer Layout for Cleaner Interfaces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional organic light emitting devices have unsatisfactory lifespan properties due to impurities infiltrating the interfaces between emissive and electron transport layers during the manufacturing process.
Innovation Solution
An organic light emitting device with a multilayer structure featuring emissive layers (red, green, blue) and electron transport layers, where each electron transport layer is formed in the same chamber as its corresponding emissive layer, with a common second electron transport layer across all sub-pixels, minimizing impurity infiltration and improving interface characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional manufacturing processes are used to form emissive and electron transport layers separately in different chambers, then manufacturing flexibility is maintained, but impurities infiltrate the interfaces between layers during chamber transfer, reducing device lifespan
Solution Approach 1:
The patent merges the formation of emissive layers and electron transport layers into a single deposition chamber. The multi-layer organic structure includes emissive layers (red, green, blue) and electron transport layers formed sequentially in the same vacuum environment, eliminating chamber transfers and preventing impurity infiltration at interfaces. This combining approach directly resolves the contradiction by maintaining interface quality while improving device lifespan.
Solution Approach 2:
The patent utilizes a vacuum deposition chamber providing an inert atmosphere throughout the entire manufacturing process. By maintaining vacuum conditions during the formation of all organic layers (emissive and electron transport layers), the inert environment prevents oxidation and contamination at layer interfaces, thereby improving both interface quality and device lifespan without requiring multiple chamber transfers.
2Manufacturing precision
If multiple chamber transfers are performed during organic layer formation, then different materials can be deposited with specialized equipment, but impurity infiltration occurs at interfaces, worsening device reliability
Solution Approach 1:
The patent combines multiple deposition operations into a single chamber process. The organic layer formation includes sequential deposition of hole injection layers, emissive layers, electron transport layers, and electron injection layers all within the same vacuum chamber, eliminating the need for chamber transfers and ensuring continuous clean interface formation.
Solution Approach 2:
The patent maintains continuous vacuum deposition without interruption or chamber transfer during the formation of all organic layers. The deposition process continues uninterrupted from hole injection layer through emissive layers to electron transport and injection layers, ensuring continuous clean interface formation and preventing impurity infiltration throughout the entire manufacturing sequence.
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 significantly enhances the lifespan of the organic light emitting device by preventing impurity infiltration and improving the interface between emissive and electron transport layers, leading to improved performance and manufacturing efficiency.
Implementation Method 1
An organic light emitting device is a self-emitting device that has a wide viewing angle, excellent contrast, and quick response time
Data Source
AI summary
An organic light emitting device that has improved lifespan properties by improving the characteristics of an interface between at least one of a red emissive layer, a green emissive layer or a blue emissive layer, and an electron transport layer, and a method of manufacturing the organic light emitting device.