Fluorescent lighting creating white light

Details Fluorescent lighting creating white light Fluorescent lighting creating white light

2007-04-10

2011-10-11

Williams, Joseph L (Department: 2889)

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

C313S498000, C313S503000

Reexamination Certificate

active

08035287

ABSTRACT:
A light emitting system (1) comprising a radiation source (2) capable of emitting a first light of at least a first wavelength spectrum; a first fluorescent material (4) capable of absorbing at least partially the first light and emitting second light having a second wavelength spectrum; a second fluorescent material (8) capable of absorbing at least partially the first light and emitting a third light having a third wavelength spectrum; wherein one, the first (4) or the second fluorescent material (8) is a polycrystalline ceramic with a density of more than 97 percent of the density of a monocrystalline material and the respective other fluorescent material is a phosphor powder with a median particle size 100 nm<d50%<50 μm.

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Tanabe Setsuhisa et al: “YAG glass-ceramic phosphor for white LED (II): Luminescence characteristics” Proc SPIE Int Soc Opt Eng; Proceedings of SPIE—The International Society for Optical Engineering; Fifth International Conference on Solid State Lighting 2005, vol. 5941, 2005, pp. 1-6, XP002459950.
Sakuma K et al: “Warm-white light-emitting diode with yellowish orange SiA10N ceramic phosphor” Optics Letters, OSA, Optical Society of America, Washington, DC, US, vol. 29, No. 17, Sep. 1, 2004, pp. 2001-2003, XP002368762 ISSN: 0146-9592.

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