Organic Light Emitting Device Hole Transport Layer Segmentation
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Solution Overview
Problem
There is a continuous demand for organic light emitting devices with improved driving voltage, efficiency, and lifetime, as existing devices face limitations in these areas.
Innovation Solution
The organic light emitting device incorporates a light emitting layer with a compound represented by Chemical Formula 1 and a hole transport region with a compound represented by Chemical Formula 2, which are specifically designed to enhance the device's performance by optimizing the injection and transport of holes and electrons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional organic material layers are used, then the device structure is simple, but the driving voltage is high and efficiency is low
Solution Approach 1:
The organic material layer is divided into multiple functional sub-layers: hole injection layer, hole transport layer, light emitting layer, electron transport layer, and electron injection layer. Each layer is optimized with specific compounds to improve hole and electron balance, resulting in reduced driving voltage and enhanced efficiency while maintaining manageable structural complexity through systematic functional segmentation.
2Device complexity
If conventional organic material layers are used, then the device structure is simple, but the lifetime is short
Solution Approach 1:
The device is segmented into specialized layers with optimized compounds for each function. The hole transport layer uses compounds with appropriate HOMO levels, the light emitting layer employs phosphorescent dopants for efficient exciton utilization, and the electron transport layer uses compounds with suitable LUMO levels. This systematic segmentation improves charge balance and reduces degradation, extending device lifetime.
Solution Approach 2:
Each layer employs composite material systems combining host materials with dopant materials. The light emitting layer uses phosphorescent dopants embedded in host matrices, creating composite structures that enhance exciton utilization efficiency and stabilize the operating conditions, thereby improving device lifetime.
3Productivity
If phosphorescent dopant materials are used in the light emitting layer, then efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent combines phosphorescent dopant materials with carefully selected host materials in the light emitting layer to achieve efficient exciton utilization. By merging the phosphorescent emission mechanism with optimized host-guest systems and balanced charge transport layers, the device achieves high efficiency while the overall complexity is managed through systematic layer integration rather than isolated complex components.
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 device exhibits improved driving voltage, efficiency, and lifetime, with the compounds in the light emitting layer and hole transport region providing balanced hole and electron transport, leading to remarkable performance characteristics.
Implementation Method 1
an organic light emitting phenomenon refers to a phenomenon where electric energy is converted into light energy by using an organic material
Data Source
Figure 1~3
AI summary
[Summary] The present invention provides an organic light emitting device having improved driving voltage, efficiency and lifetime.