Composite Wavelength Converter

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This invention describes a composite wavelength converter designed for LEDs, particularly white LEDs (WLEDs). It consists of a central single crystalline garnet phosphor substrate with at least one or more epitaxial layers of garnet phosphor grown on its surfaces, each containing various activator ions to modify the emission spectrum. The converter efficiently converts blue or ultraviolet light from an LED into visible white light, with tunable color rendering and temperature. The invention also covers methods for manufacturing these converters using liquid phase epitaxy, resulting in high quantum efficiency and customizable optical properties.

Use CasesContent extracted from patent full text and abstract with AI.

• White LED lighting for homes, offices, and public spaces
• Backlighting for LCD displays in TVs, smartphones, and monitors
• Automotive lighting (headlights, interior lighting, etc.)
• General-purpose high-brightness LED lamps and spotlights
• Medical or industrial lighting requiring high color rendering
• Specialized lighting applications needing adjustable color temperature or spectrum

BenefitsContent extracted from patent full text and abstract with AI.

• High quantum efficiency (energy conversion is very effective, at least 80%)
• Spectrum tuning and color temperature adjustment are possible via layered design and activator selection
• High power, stable, and durable white LEDs can be realized
• Flexible material system allows for adaptation to blue or UV LED excitation
• Enhanced color rendering index (CRI) for more natural-looking white light
• Thick, high-quality single crystalline layers improve light conversion performance and lifetime
• Manufacturing process allows mass production of converters with identical optical properties

Technical Classifications (CPCs)

Inventors & Applicants

Patent Abstract

The invention refers to a composite wavelength converter (1) for an LED (100), comprising a substrate (10) and an epitaxial film (20) formed by liquid phase epitaxy on the top and bottom of the substrate (10). Furthermore, the invention refers to a method of preparation of a composite wavelength converter (1) for an LED (100). Furthermore, the invention refers to a white LED light source comprising an LED (100) and an inventive composite wavelength converter (1) mounted on a light emitting surface of the LED (100).