Orange-yellow phosphor and warm white LED using the same

Details Orange-yellow phosphor and warm white LED using the same Orange-yellow phosphor and warm white LED using the same

2008-02-07

2011-10-04

Koslow, Carol M (Department: 1734)

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

C252S30140H, C428S404000, C428S403000

Reexamination Certificate

active

08029699

ABSTRACT:
A phosphor providing orange-yellow radiation is prepared from a cerium activated rare-earth garnet substrate that contains Li (lithium), Si (silicon), N (nitrogen) and F (fluorine) atoms, obtaining the overall stoichiometric equation of (ΣLn)3Al5-x-yLiy/3Mgx/2Si(x/2+2y/3)Fq/2O12-qNq/2. When the activating wavelength is 440˜475 nm, the orange sub-energy band becomes 542˜590 nm, and the radiation quatum ouput q>0.9, showing a cubic crystal garnet structure. The phosphor has color coordinate Σ(x+y)≧0.89, and color purity α≧0.89. The invention also provides a warm white LED that has light intensity J≧300 cd, half open angle 2θ≧60°, luminous efficiency 65≦ζ≦100 lm/W, and color temperature within 2800≦T≦5500K.

REFERENCES:
patent: 7005197 (2006-02-01), Shiiki et al.
patent: 2006/0219927 (2006-10-01), Venkataramani et al.
patent: 2009/0152495 (2009-06-01), Naum et al.
patent: 2009/0179212 (2009-07-01), Naum et al.

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