Organic Light Emitting Element With Overdoping Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current organic light emitting elements exhibit low emission efficiency and short lifetime, requiring high voltage for operation.
Innovation Solution
The implementation of an organic light emitting element with a p-n junction formed by overlapping two light emitting members, where at least one p-type or n-type overdoping layer is introduced between them, reducing driving voltage while maintaining high current efficiency and extending the element's lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a typical organic light emitting member structure is used, then the device can be manufactured with standard processes, but the emission efficiency is low and lifetime is short
Solution Approach 1:
The organic light emitting member is divided into multiple functional layers including hole injection layer, hole transport layer, emission layer, electron transport layer, and electron injection layer. This segmentation allows each layer to be optimized independently for its specific function, improving overall device performance, emission efficiency, and lifetime.
Solution Approach 2:
Different materials with specific properties are selected for each functional layer to optimize local performance. For example, the hole injection layer uses materials with high hole mobility, while the emission layer uses phosphorescent materials for high efficiency. This local optimization resolves the contradiction between reliability and emission efficiency.
2Illumination intensity
If high voltage is applied to generate sufficient current, then the light emission can be maintained, but the emission efficiency decreases and lifetime is reduced
Solution Approach 1:
The patent optimizes the thickness, material composition, and doping levels of each functional layer to achieve low-voltage operation. By changing these parameters, the device can maintain high light emission intensity while operating at lower voltages, thereby improving emission efficiency and extending lifetime.
Solution Approach 2:
The patent employs composite material structures where each layer is composed of materials specifically selected for their electrical and optical properties. This composite approach enables efficient charge transport and recombination at lower voltages, resolving the contradiction between illumination intensity and energy efficiency.
3Ease of manufacture
If the organic light emitting member structure is simplified, then the manufacturing is easier, but the current efficiency and lifetime are compromised
Solution Approach 1:
The patent designs a multi-layer structure where each layer serves multiple functions. For example, the hole transport layer not only transports holes but also serves as a barrier to prevent material degradation. This multi-functionality maintains high reliability and lifetime while keeping the manufacturing process manageable through standardized deposition techniques.
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 enhances emission efficiency and extends the lifetime of the organic light emitting element while allowing for low-voltage operation, improving power efficiency and maintaining high current efficiency.
Implementation Method 1
at least one p-type or n-type overdoping layer is formed between two light emitting members forming a p-n junction
Implementation Method 2
a first emission layer emitting light; a second emission layer that contacts the second impurity layer and emits light
Data Source
AI summary
An organic light emitting element and an organic light emitting device including the same is provided. At least one p-type or n-type overdoping layer is formed between two light emitting members forming a p-n junction in the organic light emitting element.