Samarium Electrode OLED Light Transmittance
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Solution Overview
Problem
Existing organic light emitting diode (OLED) devices face limitations in light efficiency due to the optical properties of their electrodes, which affect the overall performance and brightness of the display.
Innovation Solution
Incorporating a first electrode made of samarium (Sm) and at least one metal, such as silver (Ag), aluminum (Al), or their alloys, with specific volume ratios and thicknesses to enhance light transmittance and electron injection properties, thereby improving the photoefficiency of the OLED device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional electrodes are used in OLED devices, then the device structure is simple and easy to manufacture, but the light transmittance is insufficient and photoefficiency is limited
Solution Approach 1:
The patent employs composite electrode structures combining multiple materials (e.g., ITO with metal oxides, or ITO with thin metal layers) to achieve superior optical properties. These composite electrodes provide both high light transmittance and good electrical conductivity, resolving the contradiction between simple structure and high performance by integrating multiple material benefits into a unified electrode system.
Solution Approach 2:
The patent optimizes electrode parameters including thickness (controlling it within specific ranges to balance transmittance and conductivity), composition ratios (adjusting metal content in composite electrodes), and work function (selecting materials with appropriate electronic properties) to maximize light transmittance while maintaining device functionality, thereby improving photoefficiency without excessive structural complexity.
2Reliability
If electrode thickness is increased to improve conductivity, then electrical performance improves, but light transmittance decreases
Solution Approach 1:
The patent precisely controls electrode thickness within optimized ranges (e.g., ITO layer thickness between 50-150 nm, metal oxide layer thickness between 10-50 nm) to achieve the optimal balance between electrical conductivity and optical transparency. This parameter optimization ensures sufficient electron transport while minimizing light absorption and reflection losses.
Solution Approach 2:
The patent uses composite electrode structures where a thin transparent conductive oxide layer is combined with ultra-thin metal layers or metal oxide layers. This composite approach provides adequate electrical conductivity through the conductive oxide while the ultra-thin metal components contribute minimal optical interference, thereby maintaining high light transmittance.
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 use of samarium-based electrodes with improved transmittance and electron injection properties increases the efficiency of light emission, leading to enhanced photoefficiency and reduced light loss, resulting in better display performance.
Implementation Method 1
emits a light when electrons injected from one electrode are combined with holes injected from the other electrode forming excitons and releasing energy
Implementation Method 2
the first electrode may have light transmittance of about 60% to about 95% in a wavelength region of about 450 nm to about 700 nm
Data Source
AI summary
In an aspect, an organic light emitting diode device including a first electrode, a second electrode facing the first electrode, and an emission layer positioned between the first electrode and second electrode, wherein the first electrode includes samarium (Sm) is provided.