Porous Base Substrate Light Extraction for OLEDs
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Solution Overview
Problem
Organic electroluminescent lighting devices suffer from low light extraction efficiency due to significant light loss as light travels through multiple interfaces, leading to increased power consumption and reduced device lifetime.
Innovation Solution
A light extraction structure with a base substrate having irregularly distributed pores that scatter light, featuring different scattering degrees and surface roughness levels, optimizing transmittance and diffusivity to enhance light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light passes through multiple interfaces in a conventional organic electroluminescent lighting device, then light can be emitted to the light extraction surface, but light loss increases and light extraction efficiency decreases
Solution Approach 1:
The patent introduces a base substrate with irregularly distributed pores having different diameters (first diameter and second diameter) to create multiple scattering centers. This porous structure scatters light at multiple points within the substrate, increasing the probability of light extraction and reducing light loss through the multiple interfaces that would otherwise be traversed in a conventional planar structure.
Solution Approach 2:
The patent transitions from a conventional two-dimensional planar light extraction interface to a three-dimensional porous structure within the base substrate. By creating pores extending through the substrate thickness with varying diameters, light scattering occurs in multiple spatial dimensions, enhancing light extraction efficiency without requiring light to pass through multiple flat interfaces.
2Illumination intensity
If light extraction efficiency is improved using conventional methods, then more light can be emitted, but power consumption increases
Solution Approach 1:
The patent changes the physical parameters of the base substrate by introducing pores with specific diameter ranges (first diameter and second diameter) and controlling their irregular distribution. This parameter modification creates optimal light scattering conditions that enhance light extraction efficiency without requiring increased power input, as the scattering structure passively redirects light that would otherwise be lost.
3Ease of manufacture
If a uniform pore structure is used in the base substrate, then manufacturing is simplified, but light scattering effectiveness is reduced
Solution Approach 1:
The patent employs local quality variation by creating pores with different diameters (first diameter and second diameter) distributed irregularly throughout the base substrate. This non-uniform local structure optimizes light scattering at different positions and angles, enhancing overall scattering performance while the fabrication process remains relatively simple through conventional porous formation techniques.
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
Improves light extraction efficiency and power efficiency, extending the lifetime of organic electroluminescent lighting devices by achieving high transparency and uniform white lighting effects.
Implementation Method 1
the base substrate scatters the light when the light passes through the base substrate, wherein the scattering includes a first scattering by the pores and a second scattering by at least one of the first surface or the second surface
Data Source
AI summary
A structure for extracting light, which improves light extraction efficiency by enhancing a scattering effect and improves power efficiency and thus increases the lifetime of an organic electroluminescent lighting device, is provided, and an organic electroluminescent lighting device including the structure for extracting light is also provided.