Metal Layer Between Optical Coupling Layers in OLEDs
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Solution Overview
Problem
Current OLEDs face challenges in achieving high luminous efficiency and lifetime due to light energy loss in top-emitting electroluminescent components, despite the use of optical coupling layers.
Innovation Solution
Incorporating a metal layer between optical coupling layers in the electroluminescent component to increase light reflections, with specific refractive index and thickness ranges, and using luminescent materials in these layers to enhance luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If optical coupling layers are added to improve luminous efficiency, then light extraction is enhanced, but light energy loss still occurs due to insufficient reflections
Solution Approach 1:
A metal layer with specific refractive index (1.7-2.5) and thickness (10-90 nm) is introduced as an intermediary between the organic light emitting structure layer and the optical coupling layer. This metal layer acts as a mediator to enhance light reflections and reduce light energy loss, achieving better optical coupling without excessive structural complexity
Solution Approach 2:
The patent optimizes specific parameters of the metal layer including refractive index (1.7-2.5), thickness (10-90 nm), and material composition to achieve optimal light reflection and transmission properties. By carefully controlling these parameters, the system maximizes luminous efficiency while maintaining manageable device complexity
2Productivity
If metal layer is added between optical coupling layers to increase reflections, then luminous efficiency improves, but device structure becomes more complex
Solution Approach 1:
The metal layer is strategically positioned only in specific regions where it can most effectively enhance light reflections - between the organic light emitting structure layer and the optical coupling layer. This localized placement optimizes luminous efficiency improvement while minimizing the overall structural complexity of the device
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 improves luminous efficiency by increasing light reflections and reducing energy loss, as demonstrated by simulations showing higher efficiency compared to conventional components.
Implementation Method 1
a metal layer is added into the optical coupling layers to increase the number of reflections and improve luminous efficiency
Implementation Method 2
each of the optical coupling layers has a refractive index ranging from 1.7 to 2.5
Implementation Method 3
the luminescent material comprises at least one of a fluorescence luminescent material, a phosphorescent luminescent material, and a delayed fluorescence luminescent material
Implementation Method 4
the luminescent material comprises at least one of a fluorescence luminescent material, a phosphorescent luminescent material, and a delayed fluorescence luminescent material
Data Source
AI summary
An electroluminescent component and a display device are provided. The electroluminescent component has a light output side; a first electrode far away from the light output side; an organic light emitting structure layer disposed on the first electrode; a second electrode disposed on the organic light emitting structure layer; at least two optical coupling layers laminated on the second electrode; and at least one metal layer disposed between two of the optical coupling layers adjacent to each other.