Red phosphors for solid state lighting

Details Red phosphors for solid state lighting Red phosphors for solid state lighting

2006-07-18

2006-07-18

Koslow, C. Melissa (Department: 1755)

Compositions

Inorganic luminescent compositions

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

C252S30140S, C313S503000, C257S098000

Reexamination Certificate

active

07077979

ABSTRACT:
A red phosphor composition in combination with a semiconductor light emitting device (e.g., VCSEL, LED, or LD), preferably a GaN based device, that emits light at a bright violet-blue light range, i.e., having a wavelength in the range of 400 nm to 600 nm, which can be further combined with green and blue phosphors. The red phosphor composition in the combination is a vanadate combined with yttrium, gadolinium and/or lanthanum and activated with trivalent Eu3+, Sm3+and Pr3+, or any combination thereof, with or without Tb3+as a co-dopant, has the general formula: BixLn1−xVO4:A where x=0 to 1, Ln is an element selected from the group consisting of Y, La and Gd, and A is an activator selected from Eu3+, Sm3+and Pr3+, or any combination thereof, with or without Tb3+as a co-dopant. Novel red phosphor compositions are provided when x is greater than 0 and less than 1, preferably 0.05 to 0.5.

REFERENCES:
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patent: 6544437 (2003-04-01), Park et al.
patent: 6558574 (2003-05-01), Cwak et al.

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