LED illumination device with layered phosphor pattern

Details LED illumination device with layered phosphor pattern LED illumination device with layered phosphor pattern

2007-12-20

2010-06-22

Patel, Ashok (Department: 2889)

Electric lamp or space discharge component or device manufacturi

Process

With assembly or disassembly

C445S058000, C427S058000

Reexamination Certificate

active

07740514

ABSTRACT:
A method of applying at least two phosphors to an LED, wherein a first phosphor material having a lower absorption, shorter luminescence decay time, and/or lower thermal quenching than a second phosphor material is positioned closer to the LED than the second phosphor. Such an arrangement provides a light emitting device with improved lumen output and color stability over a range of drive currents.

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patent: 2004/0056990 (2004-03-01), Setlur et al.

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