Zero-Dimensional Perovskite Polymer Composite Light Conversion
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Solution Overview
Problem
Current light converting materials, such as rare-earth phosphors and Quantum Dots, face limitations in color control and stability due to broad emission spectra and aggregation issues, which affect their performance in Solid State Lighting and LCD applications.
Innovation Solution
Development of Zero-Dimensional Perovskite particles encapsulated in polymers, which absorb one wavelength of light and emit a longer wavelength, offering tunable emission and high photoluminescence quantum yield, and can be combined with rare-earth phosphors or Quantum Dots to enhance light conversion capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If rare-earth phosphors are used as light converters, then light conversion function is achieved, but emission wavelengths tunability is poor and color control is poor due to broad FWHM and multiple emission peaks
Solution Approach 1:
The patent changes the fundamental material parameter from traditional rare-earth phosphors to quantum dots with size-dependent bandgap. By controlling quantum dot size (2-15 nm diameter), the emission wavelength can be precisely tuned across the visible spectrum, achieving narrow FWHM (20-40 nm) and excellent color control that overcomes the broad emission peaks of rare-earth phosphors
Solution Approach 2:
The patent creates a composite structure by encapsulating quantum dots within a polymer matrix. This composite approach prevents quantum dot aggregation while maintaining their size-dependent optical properties, enabling both tunable emission wavelengths and stable color control in solid-state lighting applications
2Manufacturing precision
If quantum dots are used as light converters, then emission wavelengths tunability and narrow FWHM are improved, but aggregation occurs during utilization resulting in drop of photoluminescence quantum yield and shifting of emission peaks
Solution Approach 1:
The patent introduces a polymer matrix as an intermediary medium that encapsulates individual quantum dots. This polymer shell acts as a physical barrier preventing quantum dot aggregation and interaction, thereby maintaining stable photoluminescence quantum yield and preventing emission peak shifting during device operation
Solution Approach 2:
The patent uses a polymer encapsulation shell to isolate quantum dots from each other. This flexible shell approach maintains the quantum dots' optical properties while preventing aggregation, ensuring long-term stability and reliability of the light converting material in solid-state lighting applications
3Adaptability or versatility
If quantum dots with small particle sizes are used, then quantum confinement effect is achieved improving luminescent properties, but aggregation occurs due to small distances between particles
Solution Approach 1:
The patent segments the quantum dot system by individually encapsulating each quantum dot within a polymer matrix. This segmentation approach maintains the small particle size (2-15 nm) necessary for quantum confinement effect while preventing aggregation by isolating each particle, thus achieving both improved luminescent properties and stable particle distribution
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 Zero-Dimensional Perovskite/polymer composites provide narrow emission peaks, high photoluminescence quantum yield, and improved stability, enabling better color control and efficiency in generating white light and backlighting for LCDs, surpassing the limitations of existing materials.
Implementation Method 1
the material absorbs a first wavelength of light and emits light with a second wavelength, wherein the second wavelength is longer than the first
Data Source
AI summary
Described herein are compositions and methods relating to light converting luminescent Zero-D perovskite composite materials.