Nitrogen-containing Luminescent Particle Core-Shell Gradient
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Solution Overview
Problem
Current nitrogen-containing luminescent particles for LEDs face a trade-off between aging and light decay resistance and luminescent efficiency, with existing solutions either improving one at the expense of the other, lacking a comprehensive solution that enhances both without reducing efficiency.
Innovation Solution
A nitrogen-containing luminescent particle with a structured composition divided into an oxygen-poor zone, a transition zone, and an oxygen-rich zone, where the oxygen content increases from the core to the surface, utilizing a nitride luminescent crystal, a nitroxide material, and an oxide or oxynitride material, ensuring high luminescent efficiency and improved chemical and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxygen content is increased to improve chemical stability and aging resistance, then durability is improved, but luminescent efficiency decreases
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the core region maintains high nitrogen content for luminescent efficiency while the shell region has higher oxygen content for chemical stability. This spatial differentiation of composition allows each region to optimize its function: the core preserves photoluminescent properties while the shell provides protection against degradation.
Solution Approach 2:
The patent employs composite materials by combining nitride phases (for luminescence) with oxynitride or oxide phases (for stability) in a core-shell configuration. This composite structure integrates the advantages of both material types: the nitride core provides high quantum efficiency while the oxide/oxynitride shell enhances chemical stability and resistance to aging.
2Use of energy by moving object
If nitrogen content is maintained high to preserve luminescent efficiency, then quantum efficiency is improved, but chemical stability and durability are reduced
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the core region maintains high nitrogen content for luminescent efficiency while the shell region has higher oxygen content for chemical stability. This spatial differentiation of composition allows each region to optimize its function: the core preserves photoluminescent properties while the shell provides protection against degradation.
Solution Approach 2:
The patent uses the shell layer as an intermediary that protects the nitrogen-rich core from environmental degradation. The oxide/oxynitride shell acts as a barrier that prevents direct exposure of the sensitive nitride core to moisture and oxygen, thereby maintaining both luminescent efficiency and chemical stability simultaneously.
3Ease of manufacture
If uniform composition is used to simplify manufacturing, then production ease is improved, but performance balance between efficiency and stability is lost
Solution Approach 1:
The patent applies segmentation by dividing the particle into distinct core and shell regions with different compositions. While this creates structural complexity, the synthesis method uses sequential precipitation or core-shell growth mechanisms that can be implemented through standardized chemical processes, making the segmented structure achievable through routine manufacturing techniques.
Solution Approach 2:
The patent employs parameter changes by controlling the local stoichiometry and oxidation state during different stages of particle formation. By adjusting composition parameters spatially (nitrogen-rich core vs. oxygen-rich shell) and temporally (sequential formation), the patent achieves optimal performance balance while using controllable synthesis parameters that can be scaled for mass production.
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 structured nitrogen-containing luminescent particle achieves excellent chemical stability, aging resistance, and high luminescent efficiency, suitable for various luminescent devices, with a manufacturing method that is easy and reliable for industrial mass production.
Implementation Method 1
a nitride luminescent crystal... capable of being effectively excited with UV light, violet light, or blue light
Data Source
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AI summary
The present invention discloses a nitrogen-containing luminescent particle, characterized in that a structure of the nitrogen-containing luminescent particle is divided into an oxygen poor zone, a transition zone, and an oxygen rich zone from a core to an outer surface of the particle depending on an increasing oxygen content, the oxygen poor zone being predominantly a nitride luminescent crystal or oxygen-containing solid solution thereof, the transition zone being predominantly a nitroxide material, the oxygen rich zone being predominantly an oxide material or oxynitride material; the nitride luminescent crystal or oxygen-containing solid solution thereof has a chemical formula of Mm-m1Aa1Bb1Oo1Nn1:Rm1, the nitroxide material has a chemical formula of Mm-m2Aa2Bb2Oo2Nn2:Rm2, the oxide material or oxynitride material has a chemical formula of Mm-m3Aa3Bb3Oo3Nn3:Rm3. The nitrogen-containing luminescent particle and the nitrogen-containing illuminant of the present invention have good chemical stability, good aging and light decay resistance, and high luminescent efficiency, and are useful for various luminescent devices. The manufacturing method of the present invention is easy and reliable, and useful for industrial mass production.