Light Scattering Layer Manufacturing for OLEDs
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Solution Overview
Problem
The manufacturing processes for light scattering layers in OLEDs are complex and costly, making it difficult to control the light scattering effect and achieve efficient light extraction due to the presence of wave guide modes, which restrict the efficiency of light emission.
Innovation Solution
A method of manufacturing a light scattering layer involving the creation of raised structures on a base using a mask with hole structures, followed by deposition of materials with different refractive indices to form a planarization layer, simplifying the process and reducing costs while enhancing control over the light scattering effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a photonic crystal is used to reduce wave guide mode, then light extraction efficiency is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent replaces expensive photonic crystal structures with a simple low refractive index layer that can be manufactured using conventional processes. This layer acts as a cost-effective alternative that achieves similar light extraction enhancement without requiring complex nanostamping molds or ion beam etching, thereby reducing manufacturing complexity and cost while maintaining energy efficiency
Solution Approach 2:
The patent changes the refractive index parameter by introducing a low refractive index layer between the ITO and glass substrate. This parameter change (from high to low refractive index) modifies the optical properties to reduce wave guide mode and improve light extraction efficiency, achieving the desired effect through a simple material property adjustment rather than complex structural modifications
2Loss of energy
If photolithography process is used to manufacture light scattering layer, then light scattering effect is achieved, but manufacturing complexity increases and parameter control becomes difficult
Solution Approach 1:
The patent replaces complex photolithography processes with simple vacuum deposition or spin coating methods to create the low refractive index layer. This substitution eliminates the need for photoresist materials, pattern alignment, and etching steps, significantly simplifying the manufacturing process while maintaining effective light scattering to reduce wave guide mode
3Loss of energy
If low refractive index particles are doped in light scattering layer, then light scattering is achieved, but control over scattering effect becomes difficult due to particle variability
Solution Approach 1:
The patent uses a uniform low refractive index layer with consistent material properties throughout, replacing the heterogeneous mixture of particles with different masses and sizes. This homogeneous structure ensures predictable and controllable light scattering effects, as the scattering properties are determined by the uniform layer thickness and refractive index rather than by variable particle characteristics
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 method effectively reduces the presence of wave guide modes, enhancing light extraction efficiency in OLEDs by allowing original total reflection light to emit out, thereby improving the overall performance of the organic light-emitting diode.
Implementation Method 1
depositing a material having a first refractive index value in the hole structures of the mask
Implementation Method 2
The light scattering layer is a SiO2 layer with low refractive index and a grid structure... adding a light scattering layer between the ITO and the glass base
Data Source
AI summary
A method of manufacturing a light scattering layer and an organic light-emitting diode are provided. The manufacturing method includes: depositing a material having a low refractive index value in hole structures of a mask on a base; removing the mask, and forming a plurality of raised structures on the base; depositing a material having a high refractive index value between the raised structures to form a planarization layer, thereby manufacturing a light scattering layer constituted by the raised structures and the planarization layer on the base. The manufacturing method has the advantages of being simple to prepare, low-cost, etc.