Light-Emitting Device With Intermediate Charge-Generation Layer
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Solution Overview
Problem
Current light-emitting devices using organic electroluminescence face challenges in achieving efficient light extraction and reliable operation, particularly in maintaining low driving voltage and high emission efficiency.
Innovation Solution
Incorporating an intermediate layer between two light-emitting units with specific distance and material configurations, including a microcavity structure to optimize light extraction and emission efficiency, while maintaining low driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an intermediate layer is introduced between light-emitting units, then light extraction efficiency is improved, but driving voltage increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness of the intermediate layer (5-65 nm) and adjusting the distance between light-emitting layers (5-65 nm) to optimize the balance between light extraction efficiency and driving voltage. This quantitative parameter optimization allows the device to achieve improved light extraction while minimizing voltage increase.
Solution Approach 2:
The intermediate layer serves as a mediator between adjacent light-emitting units, facilitating charge transfer and enhancing light extraction. The intermediate layer mediates the interaction between light-emitting layers, enabling efficient energy transfer while maintaining electrical stability and controlling voltage characteristics.
2Volume of moving object
If light-emitting layers are placed closer together, then device compactness is improved, but light extraction becomes more difficult
Solution Approach 1:
The patent optimizes the distance parameter between light-emitting layers to fall within 5-65 nm, achieving a balance between device compactness and light extraction efficiency. This precise parameter control allows the layers to be positioned closely while maintaining effective light extraction through the intermediate layer.
Solution Approach 2:
The intermediate layer acts as a mediator that enables close spacing of light-emitting layers while maintaining light extraction capability. It facilitates charge transfer between closely positioned layers and manages the optical interactions that would otherwise be hindered by the reduced distance.
3Adaptability or versatility
If organic EL devices are used for image sensors requiring multiple wavelengths, then application versatility is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal light-emitting device structure that can serve multiple applications including image sensors requiring various wavelengths. The intermediate layer design enables the same basic structure to be adapted for different wavelengths and applications, reducing the need for completely different device designs for each application.
Solution Approach 2:
The device achieves versatility through parameter adjustments, particularly in the intermediate layer thickness and light-emitting layer spacing, which can be optimized for different wavelength requirements. This allows a single device architecture to be adapted for various applications from visible light to near-infrared imaging.
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 enables efficient light extraction, increased emission efficiency, and reduced driving voltage, resulting in a highly convenient and reliable light-emitting device.
Implementation Method 1
The intermediate layer has a function of supplying an electron to one of the first light-emitting unit and the second light-emitting unit and supplying a hole to the other
Implementation Method 2
Research and development has been actively conducted on light-emitting devices using organic electroluminescence (EL) phenomenon
Implementation Method 3
An example of the light-emitting organic compound is a compound capable of converting a triplet excited state into light (also referred to as a phosphorescent compound or a phosphorescent material)
Data Source
AI summary
A light-emitting device is provided. The light-emitting device includes an intermediate layer, a first light-emitting unit, and a second light-emitting unit. The intermediate layer includes a region interposed between the first light-emitting unit and the second light-emitting unit. The intermediate layer has a function of supplying an electron to one of the first light-emitting unit and the second light-emitting unit and supplying a hole to the other. The first light-emitting unit includes a first light-emitting layer, the first light-emitting layer includes a first light-emitting material, the second light-emitting unit includes a second light-emitting layer, the second light-emitting layer includes a second light-emitting material, the second light-emitting layer has a first distance from the first light-emitting layer, and the first distance is longer than or equal to 5 nm and shorter than or equal to 65 nm.