Phosphor for white light-emitting device and white...

Details Phosphor for white light-emitting device and white... Phosphor for white light-emitting device and white...

2009-10-06

2011-10-25

Koslow, Carol M (Department: 1734)

Compositions

Inorganic luminescent compositions

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

C313S503000, C313S487000, C257S098000

Reexamination Certificate

active

08043529

ABSTRACT:
Provided are an alkaline earth metal silicate-based phosphor which is a compound represented by Formula 1 below, and a white light-emitting device (LED) including the same:in-line-formulae description="In-line Formulae" end="lead"?(M11-x-yAxBy)aMgbM2cOdZe  Formula 1in-line-formulae description="In-line Formulae" end="tail"?wherein,M1 is one selected from the group consisting of Ba, Ca, and Sr;M2 is at least one selected from Si or Ge;A and B are each independently one selected from the group consisting of Eu, Ce, Mn, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Bi, Sn, and Sb;Z is at least one selected from the group consisting of a monovalent or divalent element, H, and N; and0<x<1, 0≦y≦1, 6.3<a<7.7, 0.9<b<1.1, 3.6<c<4.4, 14.4<d<17.6, 14.4<d+e<17.6, and 0≦e≦0.18. The alkaline earth metal silicate-based phosphor has a broad excitation wavelength range, and thus, both a UV-LED and a blue LED can be used as excitation sources for white LEDs. Furthermore, the total emission area of an emission spectrum of the alkaline earth metal silicate-based phosphor is greater than that of a common phosphor, thereby achieving better emission efficiency.

REFERENCES:
patent: 7618556 (2009-11-01), Shunichi et al.
patent: 2007/0200095 (2007-08-01), Murazaki

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