US 7,321,191 B2 | ||
Phosphor blends for green traffic signals | ||
Anant Achyut Setlur, Niskayuna, N.Y. (US); Emil Vergilov Radkov, Euclid, Ohio (US); Alok Mani Srivastava, Niskayuna, N.Y. (US); Stanton Earl Weaver, Northville, N.Y. (US); Thomas Elliot Stecher, Scotia, N.Y. (US); and Holly Ann Comanzo, Niskayuna, N.Y. (US) | ||
Assigned to Lumination LLC, Valley View, Ohio (US) | ||
Filed on Nov. 02, 2004, as Appl. No. 10/979,912. | ||
Prior Publication US 2006/0091778 A1, May 04, 2006 | ||
Int. Cl. C09K 11/06 (2006.01); H01L 33/00 (2006.01); H01J 1/62 (2006.01); H01J 63/04 (2006.01) |
U.S. Cl. 313—487 [313/486; 313/512; 313/503; 313/485; 257/89; 257/90; 257/94; 257/95; 252/301.16] | 19 Claims |
1. A blue-green light emitting system, comprising a semiconductor light emitter; and a luminescent material, wherein said
illumination system has an emission having CIE color coordinates located within an area of a pentagon on a CIE chromaticity
diagram, whose corners have the following CIE color coordinates:
e) x=0.0137 and y=0.4831;
b) x=0.2240 and y=0.3890;
c) x=0.2800 and y=0.4500;
g) x=0.2879 and y=0.5196; and
h) x=0.0108 and y=0.7220. wherein said luminescent material comprises two or more phosphor compositions selected from the group consisting of: (Ba,Sr,Ca)5(PO4)3(Cl,F,Br,OH):Eu2+; (Ba,Sr,Ca)MgAl10O17:Eu2+; (Ba,Sr,Ca)BPO5:Eu2+; (Sr,Ca)10(PO4)6*nB2O3:Eu2+ where n>0; 2SrO*0.84P2O5*0.16B2O3:Eu2+; Sr2Si3O8*2SrCl2:Eu2+; Ba3MgSi2O8:Eu2+; Sr4Al14O25:Eu2+; BaAl8O13:Eu2+; (Ba,Sr,Ca)Al2−xSixO4−xNx:Eu2+ where x≤2; (Ba,Sr,Ca)2SiO4:Eu2+; (Sr,Ca,Ba)(Al,Ga,In)2S4:Eu2+,Ce3+; (Ca,Sr)8(Mg,Zn)(SiO4)4Cl2:Eu2+; (Y,Lu,Gd,Tb,Sc)2(Ca,Mg)1−r(Mg,Zn)2+rSiz−qGeqO12+δ:Ce where r≤1 and z,q,δ≧0; (Y,Gd,Tb,La,Sm,Pr,Lu)3(Al,Ga)5O12:Ce3+; Sr—SiON:Eu2+,Ce3+; MSi3N5, M2Si4N7, M4Si6N11, M9Si11N23, M16Si15O6N32, MSiAl2O3N2, M13Si18Al12O18N36, MSi5Al2ON9 and M3Si5AlON10 where M can be a divalent cation or a trivalent cation doped with Eu2+ and/or Ce3+; and (Mg,Ca,Sr,Ba)pSiqAlrOxNy, where 1≤p≤16; 0≤q<30; 0≤r<15, 0≤x<20 and 0<y<40 doped with Eu2+ and/or Ce+.
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