Wavelength-Converting Member for Reliable Light Emission
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Summary
Problems
Wavelength-converting members using phosphor layers with organic binder resins suffer from deterioration under high output light, leading to decreased emission brightness and insufficient weather resistance and reliability, especially when sintering or high-temperature processes are involved.
Innovation solutions
A wavelength-converting member is created using a phosphor that undergoes cleaning and/or coating treatments, dispersed in a glass material with a specific composition (SiO2: 30-50%, Li2O: 0-15%, Na2O: 0-10%, K2O: 0-10%, B2O3: 5-15%, MgO: 0-10%, BaO: 0-10%, CaO: 0-10%, SrO: 0-10%, Al2O3: 0-10%, ZnO: 0-15%, TiO2: 10-20%, Nb2O5: 1-5%, La2O3: 0-5%), which enhances emission intensity and weather resistance.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a wavelength-converting member is constituted with a phosphor layer containing an organic binder resin, then the phosphor layer can be molded and processed easily, but the organic binder resin deteriorates by high output light in the ultraviolet to blue region causing emission brightness to decrease largely by coloring
Why choose this principle:
The patent removes the organic binder resin from the phosphor layer composition entirely, replacing it with an inorganic binder material. This extraction eliminates the source of deterioration (organic resin degradation under UV-blue light) while maintaining the necessary binding and molding functions through inorganic materials that are photostable.
Principle concept:
If a wavelength-converting member is constituted with a phosphor layer containing an organic binder resin, then the phosphor layer can be molded and processed easily, but the organic binder resin deteriorates by high output light in the ultraviolet to blue region causing emission brightness to decrease largely by coloring
Why choose this principle:
The patent changes the chemical composition parameters of the binder material from organic to inorganic. This fundamental parameter change transforms the material's properties: inorganic binders do not undergo photochemical degradation like organic resins, thereby preventing coloration and maintaining emission brightness stability while still enabling proper molding and processing.
Application Domain
Data Source
AI summary:
A wavelength-converting member is created using a phosphor that undergoes cleaning and/or coating treatments, dispersed in a glass material with a specific composition (SiO2: 30-50%, Li2O: 0-15%, Na2O: 0-10%, K2O: 0-10%, B2O3: 5-15%, MgO: 0-10%, BaO: 0-10%, CaO: 0-10%, SrO: 0-10%, Al2O3: 0-10%, ZnO: 0-15%, TiO2: 10-20%, Nb2O5: 1-5%, La2O3: 0-5%), which enhances emission intensity and weather resistance.
Abstract
A light emitting apparatus with high emission intensity and that is superior in weather resistance and reliability is obtained. The light emitting apparatus includes a light source and a wavelength-converting member for converting the wavelength of light emitted from the light source, wherein the wavelength-converting member contains a phosphor subjected to a cleaning treatment and/or a coating treatment, in a glass material having a composition of SiO 2 : 30 to 50%, Li 2 O: 0 to 15%, Na 2 O: 0 to 10%, K 2 O: 0 to 10%, Li 2 O+Na 2 O+K 2 O: 20 to 30%, B 2 O 3 : 5 to 15%, MgO: 0 to 10%, BaO: 0 to 10%, CaO: 0 to 10%, SrO: 0 to 10%, Al 2 O 3 : 0 to 10%, ZnO: 0 to 15%, TiO 2 : 10 to 20%, Nb 2 O 5 : 1 to 5%, La 2 O 3 : 0 to 5%, and TiO 2 +Nb 2 O 5 +La 2 O 3 : 11 to 20% by mole percentage.