Abstract
A phosphor-converted light-emitting diode (pcLED) luminaire featuring enhanced light extraction by internal reflection
(ELiXIR) with efficacy of 60 lm/W producing 18 lumens of yellowish green light
at 100 mA is presented. The luminaire consists of a commercial blue high power
LED, a polymer hemispherical shell lens with interior phosphor coating, and
planar aluminized reflector. High extraction efficiency of the phosphor-converted
light is achieved by separating the phosphor from the LED and using internal
reflection to steer the light away from lossy reflectors and the LED package
and out of the device. At 10 and 500 mA, the luminaire
produces 2.1 and 66 lumens with efficacies of 80 and 37 lm/W, respectively.
Technological improvements over existing commercial LEDs, such as more efficient pcLED packages or, alternatively, higher
efficiency green or yellow for color mixing, will be essential to achieving
150–200 lm/W solid-state lighting. Advances in both areas are demonstrated.
© 2007 IEEE
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