OLED Device Stacks for White Light Emission
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Solution Overview
Problem
The existing organic light emitting diode (OLED) devices, particularly white OLEDs, face challenges with low color purity, high driving voltage, and reduced productivity due to complex manufacturing processes and inefficiencies in luminous efficiency and power consumption.
Innovation Solution
The OLED device incorporates a substrate with stacks of layers, including a first and second blue layer, and emission layers for red and green lights, which are formed using a simplified mask-based manufacturing process, reducing the number of shadow masks needed and improving deposition accuracy, thereby simplifying the manufacturing process and enhancing luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a white OLED device is constructed as a stack structure of red, green, and blue emission layers or yellow-green and blue emission layers, then the device can emit white light, but the color purity is low and the driving voltage is high
Solution Approach 1:
The device is divided into multiple independent stack structures, where each stack contains specific emission layers (first stack with first emission layer and first blue layer, second stack with second emission layer and second blue layer). This segmentation allows each stack to contribute to specific color components, improving overall color purity while maintaining white light emission capability.
Solution Approach 2:
Different regions of the device have different layer compositions optimized for specific functions. The first stack and second stack have distinct emission layers and blue layers configured to emit specific wavelengths, with each local region contributing differently to the overall spectral output, thereby achieving high color purity across the white light spectrum.
2Reliability
If traditional manufacturing processes are used for OLED devices, then the device can be manufactured, but the productivity is reduced due to complex processes
Solution Approach 1:
Multiple manufacturing steps are merged into a more integrated process. The first and second stacks are formed with their respective emission layers and blue layers in a coordinated manner, reducing the total number of separate deposition and alignment operations required, thereby improving productivity without sacrificing device reliability.
Solution Approach 2:
The manufacturing process is designed to produce multiple functional components (first emission layer, second emission layer, first blue layer, second blue layer) through a unified set of deposition steps using first and second masks. This multi-functional approach allows simultaneous formation of multiple critical layers, reducing process complexity and enhancing manufacturing efficiency.
3Loss of energy
If multiple emission layers are stacked to achieve white light emission, then the luminous efficiency is improved, but the power consumption increases
Solution Approach 1:
The device optimizes the optical and electrical parameters of each emission layer and blue layer to maximize luminous efficiency. By carefully selecting materials and configuring layer thicknesses, the device achieves high quantum efficiency in each stack, reducing overall power consumption while maintaining improved luminous efficiency through the multi-layer structure.
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 results in improved luminous efficiency, reduced power consumption, and simplified manufacturing, while maintaining color purity and efficiency across red, green, blue, and white light emission, effectively addressing the limitations of existing OLED technologies.
Implementation Method 1
An electron provided from the cathode is combined with a hole provided from the anode at the emission layer to form an exciton. The exciton is transited into a ground state from an excited state, thereby emitting light.
Data Source
AI summary
An organic light emitting diode device and a method for manufacturing the same are disclosed. The organic light emitting diode device including a substrate, stacks disposed between a first electrode and a second electrode on the substrate, wherein the stacks including a first stack having a first blue layer and a second stack disposed on the first stack and having a second blue layer, and a first emission layer is formed at a partial region of the first stack, and a second emission layer is formed at a partial region of the second stack.