Silicone Resin Phosphor Composition for Moisture-Stable Light Emission
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Solution Overview
Problem
Light-emitting devices containing Mn-activated fluoride phosphors face reliability issues due to temporal changes that lead to a decrease in luminous flux, primarily caused by moisture absorption and subsequent oxide formation.
Innovation Solution
A resin composition comprising a silicone resin, a Mn-activated fluoride phosphor, and a chelating agent is used to form a wavelength conversion member, where the chelating agent captures Mn ions, reducing oxide formation and enhancing the reliability of the light-emitting device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Mn-activated fluoride phosphor is used in light-emitting devices, then color purity and emission peak characteristics are improved, but reliability deteriorates due to temporal changes and luminous flux decrease
Solution Approach 1:
A chelating agent is introduced as an intermediary substance between the Mn-activated fluoride phosphor and the surrounding environment. The chelating agent captures Mn ions that leach from the phosphor surface, preventing their oxidation and the subsequent formation of harmful oxide layers. This intermediary mechanism protects the phosphor's optical properties while maintaining color purity.
Solution Approach 2:
The invention converts the harmful effect of Mn ion leaching into a beneficial process. Instead of allowing Mn ions to oxidize and form degrading oxide layers, the chelating agent captures these ions and forms stable chelate complexes. This transforms a degradation mechanism into a protective mechanism that actually enhances long-term stability.
2Reliability
If moisture resistance is improved through surface treatment, then reliability is enhanced, but manufacturing complexity increases
Solution Approach 1:
The invention merges the phosphor material synthesis with the moisture protection function. The chelating agent is incorporated into the phosphor composition itself rather than applying a separate surface coating or treatment. This integration eliminates additional manufacturing steps while providing effective moisture and oxidation protection.
Solution Approach 2:
The invention creates a composite material system combining Mn-activated fluoride phosphor with a chelating agent. This composite approach provides both the desired optical properties of the phosphor and the protective functions of the chelating agent within a single integrated material, simplifying the overall device structure and manufacturing process.
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 use of the resin composition effectively reduces the decrease in luminous flux over time, thereby improving the reliability and stability of the light-emitting device by preventing Mn ion-related degradation.
Implementation Method 1
a chelating agent captures Mn ions, reducing oxide formation
Implementation Method 2
a Mn-activated fluoride phosphor
Data Source
AI summary
A resin composition includes a silicone resin, a Mn-activated fluoride phosphor, and a chelating agent. The chelating agent may include, for example, at least one selected from the group consisting of an aminocarboxylic-acid-based chelating agent and a phosphonic-acid-based chelating agent. The light-emitting device is provided with, for example, a substrate, a light-emitting element disposed on the substrate, and a wavelength conversion member covering the light-emitting element. The wavelength conversion member of the light-emitting device includes a cured product of a silicone resin, a Mn-activated fluoride phosphor, and a chelating agent.