Organic Light-Emitting Device Dual-Host Layer Design
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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 comprising a first host compound and a second host compound, represented by specific chemical formulas, which are different from each other, to enhance driving voltage, efficiency, and lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single host compound is used in the light emitting layer, then the device structure is simple, but the driving voltage, efficiency and lifetime are insufficient
Solution Approach 1:
The patent uses a composite host system comprising a first host compound (formula 1) and a second host compound (formula 2) in the light emitting layer. This composite material approach combines the advantages of both compounds to achieve improved driving voltage, efficiency and lifetime while maintaining reasonable device structure
2Reliability
If multiple host compounds are used in the light emitting layer, then the driving voltage, efficiency and lifetime are improved, but the device structure becomes more complex
Solution Approach 1:
The patent assigns specific roles to each host compound: the first host compound (formula 1) provides core hosting functionality while the second host compound (formula 2) with specific molecular weight range (500-2000) enhances device performance. This local differentiation of material functions optimizes the overall device performance without excessive complexity
3Duration of action of moving object
If the molecular weight of the host compound is increased, then the lifetime is extended, but the mobility may be reduced
Solution Approach 1:
The patent carefully controls the molecular weight of the second host compound within the range of 500-2000, and adjusts the blending ratio between the two host compounds. This parameter optimization ensures sufficient lifetime extension while maintaining adequate charge carrier mobility for device operation
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 extended lifetime, as demonstrated by the experimental results showing enhanced performance metrics such as voltage, efficiency, luminance, and color coordinates.
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 1~2
AI summary
The present invention provides an organic light emitting device having improved driving voltage, efficiency and lifetime.