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Phosphor Placement in White LED Packages

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A photon extraction technique reduces heat and removes photons more efficiently.

Nadarajah Narendran, Lighting Research Center at Rensselaer Polytechnic Institute

To be useful in lighting applications and to compete with traditional light sources, the white LED must show further increases in luminous efficacy and in the amount of light generated by a single device. Currently, commercial white LEDs are approaching 50 lm/W — a luminous efficacy two times greater than that produced just a couple of years ago. Most of this increase can be attributed to improvements made in light extraction from the die. Phosphor is another component that needs improvement. Even though the phosphors currently used in white LEDs have high conversion efficiencies, the way...Read full article

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    Published: July 2006
    ConsumerFeaturesLight Sourceslighting applicationsthe white LEDLEDs

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