Organic Electroluminescence Device Light Emission Region Positioning
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Solution Overview
Problem
Existing organic electroluminescence devices face challenges in enhancing device performance, particularly in achieving high light emission efficiency and preventing deactivation due to the overlap of emission spectra between the hole transport and organic light-emitting layers.
Innovation Solution
The organic electroluminescence device is configured with a hole transport layer as a coated film, an organic light-emitting layer with a light emission region positioned on the electron transport layer side, and an electron transport layer with a wider energy gap, utilizing a host and dopant material combination to optimize hole and electron mobility and reduce deactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the hole transport layer and organic light-emitting layer are configured with overlapping emission spectra, then the device structure is simplified, but deactivation occurs and light emission efficiency decreases
Solution Approach 1:
The patent applies local quality by positioning the light emission region specifically on the electron transport layer side within the organic light-emitting layer, rather than distributing it uniformly. This localized positioning ensures that emitted light does not overlap with the absorption spectrum of the hole transport layer, preventing deactivation while maintaining a simplified device structure.
Solution Approach 2:
The patent resolves the spectral overlap issue by introducing a spatial dimension solution - positioning the light emission region in a specific location (on the electron transport layer side) rather than changing the spectral properties themselves. This dimensional approach separates the emission and absorption spectra in space, eliminating deactivation without complicating the device structure.
2Device complexity
If the light emission region is positioned on the hole transport layer side, then the device structure is simplified, but deactivation due to spectral overlap increases
Solution Approach 1:
The patent applies local quality by positioning the light emission region specifically on the electron transport layer side within the organic light-emitting layer, rather than distributing it uniformly. This localized positioning ensures that emitted light does not overlap with the absorption spectrum of the hole transport layer, preventing deactivation while maintaining a simplified device structure.
Solution Approach 2:
The patent converts the potential harm of spectral overlap into a benefit by strategically positioning the light emission region where it can utilize the electron transport layer's properties while avoiding the hole transport layer's absorption spectrum, thus transforming a potential deactivation issue into an optimized performance solution.
3Loss of energy
If the energy gap of the electron transport layer is made wider, then deactivation is reduced, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by optimizing the energy gap of the electron transport layer to be wider than that of the organic light-emitting layer. This parameter adjustment ensures that the electron transport layer does not absorb light emitted by the organic light-emitting layer, reducing deactivation while maintaining manageable device complexity through careful material selection.
4Productivity
If coating method is used for forming organic layers, then manufacturing scalability is improved, but control over light emission region positioning becomes more difficult
Solution Approach 1:
The patent applies local quality by designing the organic light-emitting layer with a specific light emission region positioned on the electron transport layer side. This localized design works effectively with coating methods, as the region-specific emission properties can be achieved through controlled material composition and thickness variations in the coated film, maintaining both manufacturing scalability and positioning precision.
Solution Approach 2:
The patent applies parameter changes by optimizing the thickness and composition parameters of the organic light-emitting layer to ensure the light emission region is correctly positioned on the electron transport layer side. These parameter optimizations work well with coating processes, allowing precise control over emission characteristics while maintaining the advantages of scalable coating manufacturing.
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 light emission efficiency by positioning the light emission region on the electron transport layer side, minimizing deactivation and improving device performance, even when the energy gaps are comparable, and allows for efficient manufacturing at a large scale.
Implementation Method 1
an organic light-emitting layer configured by a coated film, the organic light-emitting layer having a light emission region provided in the organic light-emitting layer on side of the electron transport layer
Data Source
AI summary
An organic electroluminescence device includes, in order, a first electrode, a hole transport layer, an organic light-emitting layer, an electron transport layer, and a second electrode. The hole transport layer is configured by a coated film. The organic light-emitting layer is configured by a coated film. The organic light-emitting layer has a light emission region provided in the organic light-emitting layer on side of the electron transport layer.