Light Emitting Device Recess Portions Light Extraction
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Solution Overview
Problem
Current light-emitting devices face challenges in simplifying light extraction, improving light-emitting efficiency, and extending lifespan, while also requiring complex and costly manufacturing processes.
Innovation Solution
The development of a light-emitting device with recess portions in the hole transport and electron transport regions, formed using a pressurized film with carbon black and nanoparticles, which simplifies the manufacturing process and enhances light extraction efficiency by scattering light through randomly positioned recess portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If recess portions are added to transport regions to improve light extraction, then light-emitting efficiency is improved, but device structure becomes more complex
Solution Approach 1:
The transport regions incorporate recess portions that create a porous-like structure on their surfaces. These recesses scatter outgoing light waves, preventing waveguide modes and improving light extraction efficiency. The recess portions are formed by removing material to create cavities at controlled depths and densities within the transport regions.
2Manufacturing precision
If complex manufacturing processes are used to create precise recess portions, then manufacturing precision is improved, but manufacturing cost and time increase
Solution Approach 1:
The patent replaces complex mechanical or lithographic processes with a self-organizing chemical or physical process. The recess portions are formed through a mechanism that naturally creates uniform distributions without requiring precise mechanical positioning or complex photolithography patterns, thereby simplifying manufacturing while maintaining precision.
3Loss of energy
If more recess portions are created to enhance light scattering, then light extraction is improved, but manufacturing time increases
Solution Approach 1:
The manufacturing process utilizes self-organizing mechanisms where the recess portions form automatically through natural physical or chemical processes rather than requiring step-by-step mechanical fabrication. This self-service approach allows multiple recess portions to form simultaneously across the entire surface, maintaining high light extraction efficiency while avoiding sequential manufacturing delays.
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 improves light-emitting efficiency and lifespan by facilitating light extraction through scattering, while reducing manufacturing time and cost.
Implementation Method 1
The carbon black may convert the light into thermal energy that allows the nanoparticles to press the hole transport region
Implementation Method 2
The carbon black may convert the light into thermal energy that allows the nanoparticles to press the hole transport region
Implementation Method 3
enhances light extraction efficiency by scattering light through randomly positioned recess portions
Data Source
AI summary
A light-emitting device includes a first electrode; a second electrode that overlaps the first electrode in a plan view; an emission layer disposed between the first electrode and the second electrode; a hole transport region disposed between the first electrode and the emission layer; and an electron transport region disposed between the emission layer and the second electrode, and at least one of the hole transport region or the electron transport region includes a recess portion.