Rules for efficient light sources using phosphor converted LEDs

Active solid-state devices (e.g. – transistors – solid-state diode – Incoherent light emitter structure – With reflector – opaque mask – or optical element integral...

Reexamination Certificate

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C257SE33067, C438S029000

Reexamination Certificate

active

07884382

ABSTRACT:
An LED lamp including an LED and one or more phosphors, wherein for each phosphor, a figure of merit (FOM) defined as the product of (incident LED flux)×(excitation cross-section of the phosphor)×(phosphor material decay time) is less than 0.3. Such an arrangement provides a light emitting device with improved lumen output and color stability over a range of drive currents.

REFERENCES:
patent: 6466135 (2002-10-01), Srivastava et al.
patent: 6501100 (2002-12-01), Srivastava et al.
patent: 6522065 (2003-02-01), Srivastava et al.
patent: 6765237 (2004-07-01), Doxsee et al.
patent: 2003/0214233 (2003-11-01), Takahashi et al.
patent: 2004/0135504 (2004-07-01), Tamaki et al.

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