Organic Light Emitting Element Multi-Layer Impurity Doping
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Solution Overview
Problem
Organic light emitting elements and devices face challenges with low emission efficiency and short lifetime, requiring high voltage for light emission.
Innovation Solution
The organic light emitting element incorporates a multi-layered structure with impurity layers of different conductive types, forming p-n junctions with varying impurity doping levels to enhance emission efficiency and extend lifetime, allowing for lower voltage operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional organic light emitting member structure is used, then the device can emit light, but the emission efficiency is low and the lifetime is short
Solution Approach 1:
The organic light emitting member is divided into multiple functional layers including first and second light emission layers, multiple impurity layers with different conductive types (p-type and n-type), and auxiliary layers. This segmentation allows each layer to perform its specific function optimally, improving overall emission efficiency and device lifetime.
Solution Approach 2:
Different impurity layers are doped with varying amounts of impurities to create localized regions with different electrical properties. The first and second impurity layers have different doping levels, and the third and fourth impurity layers form p-n junctions with specific doping concentrations, creating optimal local conditions for charge injection and transport throughout the device.
2Power
If conventional organic light emitting members are used, then light emission can be achieved, but high voltage is required
Solution Approach 1:
The electrical parameters of the impurity layers are optimized by controlling the doping amounts. The first impurity layer is doped with a specific amount of p-type impurity, the second impurity layer with n-type impurity, and the third and fourth impurity layers with varying doping levels to form efficient p-n junctions. These parameter changes enable lower driving voltage operation.
Solution Approach 2:
The device uses a composite structure combining multiple organic materials with different properties - p-type impurity materials, n-type impurity materials, host materials, and emission materials - to create a multi-layered system that achieves low-voltage operation through synergistic effects of the different materials.
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 increases emission efficiency and extends the lifetime of organic light emitting elements while reducing the required driving voltage, improving overall performance and reliability.
Implementation Method 1
a p-type impurity layer and an n-type impurity layer are in contact with each other to form a p-n junction in portions where the emission members are in contact with each other
Implementation Method 2
An amount of an impurity doped in the second and third impurity layers is larger than an amount of an impurity doped in the first and fourth impurity layers
Implementation Method 3
The organic light emitting member may emit white light or a primary color, and it may include an emission layer and an auxiliary layer
Data Source
AI summary
The present invention relates to an organic light emitting element and an organic light emitting device including the same. An impurity layer close to an electrode is doped with a small amount, and an impurity layer for a p-n junction is doped with a large amount, such that a high current may flow under a low voltage.