LED Shield Layer for Sulfurous Component Stability
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Solution Overview
Problem
Conventional light emitting diodes (LEDs) face efficiency issues due to the sensitivity of sulfurous components and amine-based organic ligands to oxygen and moisture, leading to discoloration and reduced efficiency, especially when used in green LEDs and white light sources.
Innovation Solution
Incorporating a shield layer with an organic/inorganic hybrid polymer and a polymer barrier film to prevent sulfurous components and amine-based ligands from reacting with silver reflectors, thereby maintaining color purity and enhancing the stability and efficiency of LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If sulfurous components and amine-based organic ligands are used in light converting materials, then color purity is maintained, but the LED efficiency decreases due to reactions with oxygen and moisture
Solution Approach 1:
A shield layer comprising a polymer and an organic/inorganic hybrid polymer is introduced as an intermediary between the light converting material (containing sulfurous components and amine-based ligands) and the external environment (oxygen and moisture). This shield layer prevents direct contact and harmful reactions, thereby maintaining both color purity and LED efficiency over time.
Solution Approach 2:
The shield layer is constructed using composite materials - specifically a combination of polymer and organic/inorganic hybrid polymer. This composite structure provides enhanced protection against oxygen and moisture penetration, effectively preventing the degradation of light converting materials while preserving their optical properties.
2Productivity
If sulfurous components are present on the light source, then light converting function is achieved, but discoloration occurs due to reaction with silver reflector
Solution Approach 1:
The shield layer acts as a protective intermediary between the sulfurous components in the light converting material and the silver reflector. By blocking direct contact, it prevents the formation of silver sulfide and associated discoloration, thereby maintaining both the light converting function and the visual appearance of the LED.
3Reliability
If amine-based organic ligands are used to bond semiconductor nanocrystals, then quantum dot stability is improved, but non-emission occurs due to reaction with oxygen and moisture
Solution Approach 1:
The shield layer creates an inert protective environment around the quantum dots by blocking external oxygen and moisture. This allows the amine-based organic ligands to maintain their bonding function without undergoing harmful oxidation or hydrolysis reactions, thereby preventing non-emission and preserving quantum dot stability and light emitting capability.
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 solution significantly improves the long-term efficiency and stability of LEDs by preventing discoloration and maintaining luminance, with the luminance of the light emitting diode remaining greater than 80% after 250 hours of operation.
Implementation Method 1
Incorporating a shield layer with an organic/inorganic hybrid polymer and a polymer barrier film to prevent sulfurous components and amine-based ligands from reacting with silver reflectors
Implementation Method 2
A light emitting diode is provided that includes: a light source
Data Source
AI summary
A light emitting diode that includes: a light source; a buffer layer disposed on the light source and including a first matrix polymer; a polymer layer disposed on the buffer layer and including an organic/inorganic hybrid polymer; and an emission layer disposed on the polymer layer and including a light emitting particle dispersed in a second matrix polymer, wherein one selected from the light source, the buffer layer, the emission layer, and a combination thereof includes one selected from sulfurous component, a nitrogenous component, and a combination thereof.