Quantum Dot Composite Coating for Heat-Resistant LED Phosphors
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Solution Overview
Problem
Quantum dots (QDs) suffer from poor heat resistance and reliability issues, leading to functional degradation in devices such as liquid-crystal displays (LCDs), necessitating a solution to enhance their heat resistance and reliability.
Innovation Solution
A luminescent composite material is developed, comprising quantum dots or fluorescent materials coated with a Na-poly(Al—O—Si) nanocomposite coating, produced via a sol-gel method using Di-sec-Butoxyaluminoxytriethoxysilane (DBATES) and a sodium-containing catalyst, to improve heat resistance and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are used as luminescent material, then color saturation and luminous efficiency are improved, but heat resistance and reliability deteriorate
Solution Approach 1:
The patent applies composite materials by coating quantum dots with a silane-based protective layer formed through sol-gel process. The composite structure combines the optical advantages of quantum dots with the thermal stability of the silane coating, resolving the contradiction between color saturation and heat resistance.
Solution Approach 2:
The patent changes the chemical parameters of the quantum dot surface by introducing silane groups and forming cross-linked networks. This parameter change enhances the thermal stability and heat resistance of quantum dots without compromising their optical properties, thereby improving reliability while maintaining color saturation.
2Reliability
If conventional coating methods are used on quantum dots, then protection is provided, but photoluminescence quantum yield and reliability are insufficient
Solution Approach 1:
The patent applies local quality by creating a graded coating structure where the silane layer is selectively formed on the quantum dot surface. The coating density and thickness are optimized locally to provide adequate protection while maintaining high photoluminescence quantum yield, avoiding excessive energy loss.
Solution Approach 2:
The patent replaces conventional physical coating methods with a chemical sol-gel process. This substitution allows for in-situ formation of the protective layer that is chemically bonded to the quantum dot surface, providing superior protection without compromising optical performance and achieving both reliability and high photoluminescence quantum yield.
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 luminescent composite material significantly enhances heat resistance and reliability, increasing the Rec. 2020 color value by over 90% and providing up to 50% more color saturation in high-end LCDs, with a 1.74-fold enhancement in photoluminescence quantum yield and improved thermal stability.
Implementation Method 1
QDs are heat sensitive material and often suffer functional degradation due to the overheating of the device. The present invention provides a luminescent composite material having high heat resistance and reliability
Implementation Method 2
The said method comprises steps of: providing the luminescent material; adding the luminescent material into a reaction solution comprising Di-sec-Butoxyaluminoxytriethoxysilane (DBATES) and a sodium-containing catalyst; and stirring the reaction solution to synthesis Na-poly(Al—O—Si) composite as the coating from DBATES and the sodium-containing catalyst
Implementation Method 3
QDs readily absorb light emitted from LEDs and re-emit the light as white light source by combining or mixing with other suitable light wavelengths
Data Source
AI summary
Present invention is related to a luminescent composite material having a luminescent material uniformly being coated by a coating. The luminescent material of the present invention comprises any suitable QDs or a fluorescent material and the coating contains Na-poly(Al—O—Si) nanocomposites. The present invention can provide a high thermal resistance and reliability performance by the outer layer. When applying to the backlight module, the present invention could efficiently increase the luminous efficiency and the color standard of LCD. When applying to the light emitting applications, the present invention could also improve its luminous efficiency and prolong the duration for the light emitting composite material. The production method of the composite in the present invention is simple and reliable which could be easily introduced into the market with great economic benefits and values. The present invention is a revolution and great achievement for improving the entertainment, medical diagnosis, and e-commerce technologies.