Surface-Modified Phosphor Filling Cracks to Restore Light Efficiency
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Solution Overview
Problem
Phosphors manufactured through the ball mill process suffer from light efficiency and durability issues due to surface cracks, which lead to decreased lumen maintenance and accelerated deterioration from heat and moisture.
Innovation Solution
A surface-modified phosphor is developed by coating a nano-sized phosphor with a particle size ranging from 20 nm to 1000 nm onto a phosphor matrix, filling the cracks and enhancing light emission efficiency, using a method involving mixing, agitation, and solvent removal processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If phosphor is manufactured through ball mill process, then phosphor particles can be produced, but surface cracks occur causing decreased light efficiency and accelerated deterioration
Solution Approach 1:
The patent applies composite materials by combining phosphor particles with a transparent resin matrix to form a composite phosphor layer. The resin fills the cracks between particles and provides structural support, creating a composite material that maintains the light-emitting properties of phosphor while eliminating the harmful effects of surface cracks. This resolves the contradiction by preserving ease of manufacture through conventional phosphor production while dramatically improving reliability through the protective resin matrix.
Solution Approach 2:
The patent uses a transparent resin thin film to encapsulate individual phosphor particles, creating a flexible protective shell around each particle. This thin film coating prevents crack propagation and protects the phosphor from environmental deterioration while maintaining optical transparency. The flexible resin shell allows the phosphor to withstand mechanical stress without developing cracks, thus improving reliability without complicating the manufacturing process.
2Ease of manufacture
If phosphor particles are used directly, then manufacturing is simple, but lumen maintenance decreases over time due to heat and moisture deterioration
Solution Approach 1:
The patent creates a composite structure where phosphor particles are embedded in a transparent resin matrix that provides thermal and moisture protection. This composite material maintains the simplicity of phosphor application while significantly extending lumen maintenance duration by protecting against heat and moisture deterioration mechanisms.
Solution Approach 2:
The resin matrix acts as a protective cushion that is applied beforehand to prevent heat and moisture from reaching the phosphor particles. This prior cushioning protects the phosphor from environmental stressors before deterioration can occur, thereby extending the operational lifetime and maintaining lumen output over time without complicating the application process.
3Ease of manufacture
If phosphor surface has cracks, then manufacturing process is straightforward, but light efficiency decreases and deterioration accelerates
Solution Approach 1:
The patent employs composite materials by forming a resin-encapsulated phosphor structure where the transparent resin fills and seals the cracks on phosphor particle surfaces. This composite approach maintains the straightforward manufacturing process of producing phosphor particles while eliminating the harmful effects of cracks by surrounding them with a protective, transparent resin matrix that restores light efficiency and provides environmental resistance.
Solution Approach 2:
The patent converts the harmful cracks on phosphor surfaces into a beneficial structure by using the crack network as a template for resin infiltration. The resin fills the cracks and transforms them into protective channels that enhance adhesion and provide environmental barriers. This converts the originally harmful crack structure into a beneficial feature that improves both light efficiency and heat/moisture resistance while maintaining manufacturing simplicity.
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 surface-modified phosphor exhibits improved lumen maintenance and resistance to heat and moisture, maintaining high light emission efficiency and color reproducibility over time.
Implementation Method 1
a phosphor matrix including a compound represented by Chemical Formula 1 K2SiF6:Mn4+; and a nano-sized phosphor coated on the phosphor matrix
Data Source
AI summary
A surface-modified phosphor includes: a phosphor matrix represented by Chemical Formula 1,K2SiF6:Mn4+; and Chemical Formula 1a nano-sized phosphor coated on the phosphor matrix.