Organic EL Device with Segmented Resonant Lengths
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Solution Overview
Problem
Organic EL devices face challenges in achieving white light with low wavelength dispersion and reduced power consumption, as existing methods for adjusting light path lengths and resonant structures are complex and increase manufacturing costs.
Innovation Solution
The implementation of an organic EL element with a reflective layer, a first electrode, a second electrode with translucent reflectivity, and multiple organic material layers, where the first organic material layer has different thicknesses in distinct sub-regions within the light emitting region, allowing for controlled resonant lengths and suppressed enhancement of specific wavelengths, thereby achieving white light with low wavelength dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a resonance structure is formed in a top-emission type organic EL element to enhance light output, then light emission intensity is improved, but light of a specific wavelength is enhanced due to resonance, making it difficult to acquire white light having a low wavelength dispersion property
Solution Approach 1:
The organic EL element is divided into multiple emission regions (first emission region and second emission region) with different resonant lengths. The first emission region has a resonant length that enhances blue light, while the second emission region has a resonant length that enhances red light. This segmentation allows the element to emit a broader spectrum of light, achieving white light with low wavelength dispersion while maintaining high light emission intensity.
2Manufacturing precision
If the layer thickness of ITO or other transparent conductive material layers is changed to adjust resonant length, then white light with low wavelength dispersion can be achieved, but the manufacturing process becomes complicated and manufacturing cost increases
Solution Approach 1:
Different regions of the organic EL element are designed with different local qualities - specifically, different resonant lengths achieved through varying the thickness of the reflective layer or organic material layers in different emission regions. This allows each region to be optimized for specific wavelength enhancement while maintaining overall manufacturing simplicity through standardized fabrication processes.
3Manufacturing precision
If a method adjusting light path length from the reflective layer to a light emission position is used to achieve white light, then wavelength dispersion property is improved, but a complicated control process is required, reducing practical implementation feasibility
Solution Approach 1:
The resonant lengths of different emission regions are predetermined during the manufacturing process by setting specific thicknesses of the reflective layer or organic material layers. This preliminary configuration of resonant structures eliminates the need for complex post-manufacturing control processes, as the wavelength enhancement characteristics are built into the structure itself during fabrication.
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 approach enables the production of white light with low wavelength dispersion and reduced power consumption while maintaining manufacturing cost efficiency by simplifying the film forming process and avoiding complex control processes.
Implementation Method 1
a reflective layer disposed in a substrate
Implementation Method 2
a light emitting layer disposed between the first electrode and the second electrode
Implementation Method 3
a second electrode having translucent reflectivity
Data Source
AI summary
A light emitting element includes a reflective layer disposed in a substrate, a first electrode disposed through the reflective layer, a second electrode having translucent reflectivity, a plurality of organic material layers including a light emitting layer disposed between the first electrode and the second electrode, and a light emitting region defined by the first electrode, the second electrode, and the light emitting layer. A first organic material layer of the plurality of organic material layers has a first layer thickness in a first sub region within the light emitting region and has a second layer thickness, which is different from the first layer thickness, in a second sub region within the light emitting region.