OLED Light-Emitting Element Halide Gradient Structure
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Solution Overview
Problem
The high cost and adverse effects of halides in organic light-emitting elements (OLEDs) due to their impact on durability and manufacturing processes, which hinder the widespread adoption of OLEDs despite their advantages over other display technologies.
Innovation Solution
A light-emitting element structure with at least two layers between the anode and the light-emitting layer, where the layer closer to the anode has a higher concentration of halides and halogen elements than the layer closer to the light-emitting layer, allowing for reduced halide content near the light-emitting region while maintaining cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the concentration of halides in the EL layer is limited to a certain level, then the lifetime of the light-emitting element is improved, but the cost of materials and manufacture increases
Solution Approach 1:
The patent applies local quality by creating a gradient distribution of halides across different layers of the EL structure. The hole-transport layer has a higher halide concentration (0.1-10 ppm) compared to the light-emitting layer (<0.01 ppm). This localized differentiation allows the device to tolerate higher overall halide content while protecting the sensitive light-emitting region, thereby extending lifetime without requiring expensive ultra-pure materials throughout the entire structure.
2Duration of action of stationary object
If precise adjustments to purification of materials and manufacturing atmosphere are made to limit halide concentration, then the lifetime is improved, but the manufacturing cost increases
Solution Approach 1:
The patent segments the EL structure into functional layers with different halide tolerance requirements. By dividing the EL layer into a hole-transport layer and a light-emitting layer, each can be optimized independently. The hole-transport layer acts as a buffer that can contain higher halide levels from less stringent purification processes, while the light-emitting layer maintains low halide content through targeted control, reducing overall manufacturing complexity.
Solution Approach 2:
Different purification standards are applied locally to different layers. The hole-transport layer accepts materials with relaxed purification requirements (higher allowable halide content), while the light-emitting layer receives highly purified materials. This localized quality control reduces the need for expensive atmospheric control and purification systems throughout the entire manufacturing 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 structure effectively suppresses the adverse effects of halides on OLED durability without increasing manufacturing costs, enabling the production of low-cost OLED devices with comparable performance to competing technologies.
Implementation Method 1
research and development of a light-emitting element (organic EL element) which uses an organic compound and utilizes electroluminescence (EL)
Data Source
AI summary
Provided is a light-emitting element in which an adverse effect by halides in an EL layer is suppressed and which can be provided with low cost. The light-emitting element including at least two layers between an anode and a light-emitting layer. One of the two layers which is closer to the anode has higher concentration of halides and halogen elements than the other layer closer to the light-emitting layer.