OLED Scattering Layer for Light Extraction and Color Shift
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Solution Overview
Problem
Organic light emitting display (OLED) devices suffer from viewing-angle-dependent color shift due to resonance phenomena caused by light reflection at interfaces between adjacent layers, which affects light extraction efficiency.
Innovation Solution
Incorporating a scattering layer with a non-planar surface, composed of materials like benzene, naphthalene, or triazine derivatives, between or on the electrodes and light-emitting layers to scatter incident light and reduce resonance, thereby enhancing light extraction efficiency and minimizing color shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional planar OLED structure is used, then the device structure is simple and easy to manufacture, but light extraction efficiency is reduced due to resonance phenomena at layer interfaces
Solution Approach 1:
A scattering layer is introduced as an intermediary component between the electrode and light-emitting layer. This layer contains scattering centers that disrupt the resonance phenomenon occurring at the planar interface, thereby improving light extraction efficiency without fundamentally changing the overall device structure or manufacturing process
2Loss of energy
If a scattering layer is introduced to improve light extraction efficiency, then light extraction efficiency increases, but device structure and material selection become more complex
Solution Approach 1:
The scattering layer is designed with localized scattering centers distributed within a specific region, rather than requiring a complete structural redesign. The scattering centers are concentrated in the scattering layer with thickness of 1-100 nm, allowing light extraction improvement without adding complex structures throughout the entire device
3Stability of the object's composition
If a scattering layer is introduced to suppress resonance, then color shift is reduced, but manufacturing process complexity increases
Solution Approach 1:
The scattering layer is integrated into the existing OLED fabrication process sequence, combining the scattering center formation with the existing layer deposition processes. The scattering layer is formed between the electrode and light-emitting layer using established deposition techniques, merging the resonance suppression function with the existing manufacturing workflow
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 scattering layer effectively suppresses resonance and color shift, improving light extraction efficiency and maintaining color consistency across different viewing angles.
Implementation Method 1
a scattering layer on the insulating substrate and having a non-planar surface
Data Source
AI summary
An organic light emitting display (OLED) device includes: an insulating substrate; a first electrode on the insulating substrate; a second electrode on the first electrode; a light-emitting layer between the first electrode and the second electrode; a hole common layer between the first electrode and the light-emitting layer; an electron common layer between the second electrode and the light-emitting layer; and a scattering layer on the insulating substrate and having a non-planar surface, wherein the scattering layer includes at least one of benzene, naphthalene, anthracene, tetracene, pentacene, amine, benzidine, biphenyl, carbazole, pyridine, bipyridine, imidazole, phenanthroline, phenylborane, pyrimidine, or triazine, and the base material of the scattering layer includes a substituent including at least one of a benzoyl group, a carboxyl group, an aminophenoxyl group, a tricabonate group, or a styryl group.