Wavelength-converting LED

Details Wavelength-converting LED Wavelength-converting LED

2007-12-18

2007-12-18

Nadav, Ori (Department: 2811)

Active solid-state devices (e.g., transistors, solid-state diode

Incoherent light emitter structure

With reflector, opaque mask, or optical element integral...

C257S081000, C257S089000, C257S099000, C257S100000

Reexamination Certificate

active

10900376

ABSTRACT:
A wavelength-converting LED can include a light-emitting section in which an exciting element emits a blue or ultraviolet light. A fluorescent material that has a mean particle diameter D50ranging from 5 μm to 20 μm and that can convert at least part of the light emitted from the exciting element into light having a wavelength longer than an exciting wavelength, can be incorporated into the LED. A dispersing agent with a mean particle diameter D50not less than 1/10 of the mean particle diameter D50of the fluorescent material is preferably incorporated in the LED. A binder base material can be arranged to contain the fluorescent material, the dispersing agent and a binder therein. The sum of the weights of the fluorescent material and the dispersing agent is preferably in the range of 20% to 60% by weight of said binder base material to prevent the fluorescent material from precipitating in the binder base material upon curing.

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