The most popular modern method of producing white light LEDs involves converting blue LED light into longer wavelengths by employing the fluorescent properties of a phosphor compound. LED phosphor is typically imbedded into a silicone, glass, or polymer based substrate to make a lens or encapsulate for the LED (or otherwise placed into the light path). This process converts a blue LED into a white LED. We measure the efficiency of the phosphor lens materials for down-conversion of the shorter-wavelength blue light to longer-wavelength, multi-colored light to determine the overall efficiency of a white LED.
Does my product need Bispectral Fluorescence Colorimetry Phosphor Testing?
Due to the complicated nature of optical down-conversion using LED phosphor, today’s LED industry faces difficulties in measuring LED phosphor lens materials independent of the characteristics of the LED itself. At CSA Seattle, we are proud to be the first to offer a total fluorescence efficiency test specifically geared for the characterization of phosphor lens materials completely independent of an LED. Our phosphor fluorescence testing utilizes a sample of LED phosphor lens material without the LED and characterizes it, providing the user with a completely independent spectral profile which spans the visual frequency range.
With our industry-leading dual integrating sphere system, we test LED phosphor materials for:
• Spectral reflectivity
• Spectral transmissivity
• Spectral absorbance
• Spectral fluorescence (forward, backward)
• Donaldson radiance factor (reflected, transmitted)
• Optical throughput (normalized)
• Opaque, semi-transparent, or transparent samples tested
Information about Federal and State LED Lighting Programs and Resources.
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