Inorganic Nanocrystal Fluorescence Conversion Medium
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Solution Overview
Problem
Existing fluorescence conversion media using organic fluorescent dyes face issues such as concentration quenching, degradation under UV irradiation or high temperature, and insufficient fluorescence conversion efficiency due to self-absorption, leading to reduced durability and efficiency over time.
Innovation Solution
A fluorescence conversion medium utilizing inorganic nanocrystals dispersed in a transparent medium, with a core/shell semiconductor nanocrystal structure and surface modifications to enhance compatibility and stability, optimized for absorbance and emission spectra overlap to maximize conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the concentration of organic fluorescent dyes is increased to enhance fluorescence conversion efficiency, then the absorption of light from the light source is improved, but concentration quenching occurs and fluorescent quantum efficiency decreases
Solution Approach 1:
The patent transitions from organic fluorescent dyes to inorganic nanocrystals, fundamentally changing the material parameter to eliminate concentration quenching. The inorganic nanocrystals maintain stable fluorescent quantum efficiency across a wide range of concentrations, allowing optimization of fluorescence conversion efficiency without the detrimental effects observed with organic dyes.
Solution Approach 2:
The patent employs a composite structure consisting of inorganic nanocrystals dispersed in a transparent resin medium. This composite material combines the high absorption capability of inorganic nanocrystals with the optical transparency of the resin, achieving both high fluorescence conversion efficiency and maintained quantum efficiency.
2Illumination intensity
If a reactive resin is used as a light-transmitting medium to achieve good optical properties, then the transparency and optical performance are improved, but the reactive component reacts with organic fluorescent dyes causing decomposition or structural change
Solution Approach 1:
The patent changes the chemical parameter of the fluorescent material from organic dyes to inorganic nanocrystals. This fundamental material parameter change eliminates the chemical reactivity issue, as inorganic nanocrystals do not undergo decomposition or structural changes when exposed to UV irradiation or high temperature baking processes.
Solution Approach 2:
The patent replaces the reactive resin system that causes degradation with a more stable inorganic nanocrystal system. While the resin remains the same, the fluorescent material's resistance to chemical reactions and environmental stressors effectively makes it 'indisposable' and highly durable under processing and operating conditions.
3Productivity
If a fluorescence conversion medium is continuously irradiated with excited light during continuous operation, then the device maintains continuous color emission, but the fluorescent intensity decreases over time
Solution Approach 1:
The patent replaces the degradation-prone organic fluorescent dyes with highly stable inorganic nanocrystals. The inorganic nanocrystals resist photodegradation and maintain their fluorescent intensity over extended periods of continuous operation, effectively solving the durability issue while enabling continuous emission.
Solution Approach 2:
The patent employs inorganic nanocrystals that inherently possess resistance to UV irradiation and thermal stress before exposure. This pre-existing stability cushions against the degradation effects that would otherwise occur during continuous operation, maintaining fluorescent intensity over time.
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 medium achieves high fluorescence conversion efficiency with minimal deterioration over time, enabling effective color emission and improved durability in color emitting apparatuses.
Implementation Method 1
a fluorescent fine particle formed of an inorganic nanocrystal which absorbs visible and/or near ultraviolet light and emits visible fluorescence
Data Source
AI summary
A fluorescence conversion medium comprising, a fluorescent fine particle formed of an inorganic nanocrystal which absorbs visible and/or near ultraviolet light and emits visible fluorescence, and a transparent medium which disperses the fluorescent fine particle therein, an absorbance at a wavelength where the fluorescent intensity is maximized being in the range of 0.1 to 1.