Light Emitting Element Auxiliary Layer Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current organic electroluminescence display devices face challenges in achieving high luminous efficiency and long lifespan for light emitting elements, as existing technologies struggle to stabilize the recombination of holes and electrons in light emitting layers effectively.
Innovation Solution
The light emitting element incorporates a phosphorescent dopant, a hole transporting host, an electron transporting host, and at least one auxiliary light emitting layer with a thermally activated delayed fluorescence dopant, which are strategically positioned between the electrodes to enhance light emission efficiency and longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a light emitting element uses a conventional light emitting layer with phosphorescent dopant, then light emission is achieved, but luminous efficiency and lifespan are insufficient
Solution Approach 1:
The light emitting layer is divided into multiple sub-layers (first light emitting layer, second light emitting layer, third light emitting layer) with different phosphorescent dopants. Each sub-layer emits light at different wavelengths, and the segmentation allows for optimized energy utilization and reduced energy loss, thereby improving luminous efficiency while extending lifespan through distributed stress and reduced degradation in any single layer
Solution Approach 2:
The patent employs composite material structure by combining multiple light emitting layers with different phosphorescent dopants (first phosphorescent dopant, second phosphorescent dopant, third phosphorescent dopant) within a single light emitting element. This composite approach enables synergistic effects where each material contributes its optimal properties, resulting in both enhanced luminous efficiency and improved reliability through material diversity that reduces overall degradation
2Loss of energy
If the light emitting layer is designed to improve luminous efficiency, then energy transfer is optimized, but structural complexity increases
Solution Approach 1:
The light emitting layer is segmented into three distinct sub-layers, each containing specific phosphorescent dopants optimized for particular energy transfer functions. This segmentation enables precise control over energy transfer pathways and efficiency at each interface, while the modular segmented structure makes the complexity manageable through functional decomposition rather than a monolithic complex design
Solution Approach 2:
Each light emitting sub-layer is assigned specific local quality characteristics through the selection of particular phosphorescent dopants (first, second, or third phosphorescent dopant) optimized for that layer's position and function. This local optimization of material properties enables efficient energy transfer at each local interface while avoiding the need for uniform complexity throughout the entire structure
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 significantly improves the luminous efficiency and lifespan of the light emitting element by minimizing degradation and optimizing energy transfer, leading to superior performance compared to traditional designs.
Implementation Method 1
The light emitting area may include a phosphorescent dopant
Implementation Method 2
at least one auxiliary light emitting layer including a thermally activated delayed fluorescence dopant
Data Source
AI summary
A light emitting element includes a first electrode, a second electrode disposed on the first electrode, and a light emitting area disposed between the first electrode and the second electrode and including a phosphorescent dopant, a hole transporting host, and an electron transporting host, wherein the light emitting area includes at least one auxiliary light emitting layer including a thermally activated delayed fluorescence dopant, the hole transporting host, and the electron transporting host and spaced apart from the first electrode and the second electrode.