Optimized phosphor system for improved efficacy lighting sources

Abstract

A fluorescent lamp including a phosphor layer comprising a phosphor blend including four or more optimized phosphors emitting within a specific spectral range to optimize luminosity for a given color rendering index (CRI) and color coordinated temperature (CCT). The blend will include at least four phosphors selected from the following: a blue phosphor having an emission peak at 440-490 nm, a blue-green phosphor having an emission peak at 475-525 nm, a green phosphor having an emission peak at 515-550 nm, an orange phosphor having an emission peak from 550-600 nm, a deep red phosphor having an emission peak at 615-665 nm, and a red phosphor having an emission peak at 600-670 nm.

What is claimed is:  
     
         1 . An arc discharge lamp having an improved luminosity for a given color rendering index and color coordinated temperature, the lamp comprising 
 a lamp envelope enclosing a discharge space and having an inner surface;    an ionizable medium within said lamp envelope comprising mercury and an inert gas;    first and second electrodes; and    a phosphor layer comprising a phosphor blend on said inner surface, said blend including at least one of each of: a blue phosphor having an emission peak at 440-490 nm or a blue-green phosphor having an emission peak at 475-525 nm, a green phosphor having an emission peak at 515-550 nm, an orange phosphor having an emission peak from 550-600 nm, and a red phosphor having an emission peak at 600-670 nm.    
     
     
         2 . A lamp according to  claim 1 , wherein said phosphors are mixed in proportions such that said lamp exhibits a correlated color temperature of between about 2500 to about 10000 K and a color rendering index of about 70 or greater.  
     
     
         3 . A lamp according to  claim 1 , further comprising a UV reflecting barrier layer between said phosphor layer and said lamp envelope.  
     
     
         4 . A lamp according to  claim 1 , wherein said phosphor layer has a median particle size of 1 to 10 microns  
     
     
         5 . A lamp according to  claim 4 , wherein said thickness of said phosphor layer is 4-6 particles thick.  
     
     
         6 . A lamp according to  claim 1 , wherein said blue phosphor is selected from the group consisting (Ba,Sr,Ca) 5 (PO 4 ) 3 (Cl,F,OH):Eu 2+ , Mn 2+ , Sb 3+ ; (Ba,Sr,Ca)MgAl 10 O 17 :Eu 2+ ,Mn 2+ ; and (Ba,Sr,Ca)BPO 5 :Eu 2+ , Mn 2+ ; said blue-green phosphor is selected from the group consisting of Sr 4 Al 14 O 25 :Eu 2+ ; BaAl 8 O 13 :Eu 2+ ; 2SrO-0.84P 2 O 5−0.16 B 2 O 3 :Eu 2+ ; MgWO 4 ; BaTiP 2 O 8 ; (Ba,Sr,Ca)MgAl 10 O 17 :Eu 2+ ,Mn 2+ ; (Ba,Sr,Ca) 5 (PO 4 ) 3 (Cl,F,OH):Eu 2+ ,Mn 2+ , Sb 3+ ; said green phosphor is selected from the group consisting of LaPO 4 :Ce 3+ , Tb 3+ ; CeMgAl 11 O 19 :Tb 3+ ; GdMgB 5 O 10 :Ce 3+ , Tb 3+ , Mn 2+ ; (Ba,Sr,Ca)MgAl 1o O 17 :Eu 2+ ,Mn 2+ ; Zn 2 (Si,Ge)O 4 :Mn 2+ ; SrAl x O (1+3/2x) :Eu 2+  (x=2−2.4); (Ba,Sr,Ca) 2 SiO 4 :Eu 2+ ; and GdB 3 O 6 :Ce 3+ ,Mn 2+ ; said orange phosphor is selected from the group consisting of (Y,In,Gd,La,Lu,Sc)BO 3 :Eu 3+ ; YVO 4 :Dy 3+ ; GdMgB 5 O 10 :Ce 3+ , Dy 3+ ; (Tb, Y, Lu, La, Gd) 3 (Al,Ga) 5 O 12 :Ce 3+ ; (Ba,Sr,Ca) 5 (PO 4 ) 3 (Cl,F,OH):Eu 2+ ,Mn 2+ , Sb 3+ ; and (Sr,Ba)GdB 8 O 16 :Eu 3+ ; and said red phosphor is selected from the group consisting of (Y,Gd,La,Lu, Sc) 2 O 3 :Eu 3+ ; (Y,Gd, La, In, Lu, Sc)BO 3 :Eu 3+ ; (Y,Gd,La)(Al,Ga)O 3 :Eu 3+ ; (Ba,Sr,Ca)(Y,Gd, La, Lu) 2 O 4 :Eu 3+ ; (Y,Gd)Al 3 B 4 O 12 :Eu 3+ ; monoclinic Gd 2 O 3 :Eu 3+ ; (Gd,Y) 4 (Al,Ga) 2 O 9 :Eu 3+ ; (Ca,Sr)(Gd,Y) 3 (Ge,Si)Al 3 O 9 :Eu 3+ ; YVO 4 :Eu 3+ ; (Y,Gd,La,Lu) 3 GaO 6 :Eu 3+ ; (Sr,Mg) 3 (PO 4 ) 2 :Sn 2+ ; 3.5MgO-0.5MgF 2 —GeO 2 :Mn 4+ ; and GdMgB 5 O 10 :Ce 3+ ,Mn 2+ .  
     
     
         7 . A lamp according to  claim 1 , wherein said phosphor blend comprises BaMgAl 10 O 17 :Eu 2+ ; Zn 2 SiO 4 :Ge 4+ ,Mn 2+ ; (Y,In)BO 3 :Eu 3+ ; and Y 2 O 3 :Eu 2+ .  
     
     
         8 . A lamp according to  claim 1 , wherein said phosphor blend comprises (Ba,Sr,Ca) 5 (PO 4 ) 3 (Cl,F,OH):Eu 2+ , Mn 2+ , Sb 3+ ; Zn 2 SiO 4 :Ge 4+ ,Mn 2+ ; (Y,In)BO 3 :Eu 3+ ; and Y 2 O 3 :Eu 2+ .  
     
     
         9 . A lamp according to  claim 1 , wherein the spectral weight of the blue or blue green phosphor is 0-0.3, the spectral weight of the green phosphor is 0.25-0.6, the spectral weight of the red phosphor is 0-0.55 and the spectral weight of the orange phosphor is 0-0.55.  
     
     
         10 . A lamp according to  claim 1 , wherein said visible light has predetermined color coordinates on the CIE scale wherein the x value is in the range of 0.3 to 0.4 and y is in the range of 0.3 to 0.4.  
     
     
         11 . An arc discharge lamp having an improved luminosity for a given color rendering index and color coordinated temperature, the lamp comprising 
 a lamp envelope enclosing a discharge space and having an inner surface;    an ionizable medium within said lamp envelope comprising mercury and an inert gas;    first and second electrodes; and    a phosphor layer comprising a phosphor blend on said inner surface, said blend including at least one of each of: a blue phosphor having an emission peak at 440-490 nm, a blue-green phosphor having an emission peak at 475-525 nm, a green phosphor having an emission peak at 515-550 nm, and a red phosphor having an emission peak at 600-670 nm.    
     
     
         12 . A discharge lamp according to  claim 11 , wherein said phosphors are mixed in proportions such that said lamp exhibits a correlated color temperature of between about 2500 to about 10000 K and a color rendering index of about 85 or greater.  
     
     
         13 . A lamp according to  claim 11 , further comprising a UV reflecting barrier layer between said phosphor layer and said lamp envelope.  
     
     
         14 . A lamp according to  claim 11 , wherein said phosphor layer has a median particle size of 1 to 10 microns  
     
     
         15 . A lamp according to  claim 11 , wherein said thickness of said phosphor layer is 4-6 particles thick.  
     
     
         16 . A lamp according to  claim 11 , wherein said blue phosphor is selected from the group consisting (Ba,Sr,Ca) 5 (PO 4 ) 3 (Cl,F,OH):Eu 2+ , Mn 2+ , Sb 3+ ; (Ba,Sr,Ca)MgAl 10 O 17 :Eu 2+ ,Mn 2+ ; and (Ba,Sr,Ca)BPO 5 :Eu 2+ , Mn 2+ ; said blue-green phosphor is selected from the group consisting of Sr 4 Al 14 O 25 :Eu 2+ ; BaAl 8 O 13 :Eu 2+ ; 2SrO-0.84P 2 O 5.0−0.16 B 2 O 3 :Eu 2+ ; MgWO 4 ; BaTiP 2 O 8 ; (Ba,Sr,Ca)MgAl 10 O 17 :Eu 2+ ,Mn 2+ ; (Ba,Sr,Ca) 5 (PO 4 ) 3 (Cl,F,OH):Eu 2+ ,Mn 2+ , Sb 3+ ; said green phosphor is selected from the group consisting of LaPO 4 :Ce 3+ , Tb 3+ ; CeMgAl 11 O 19 ;Tb 3+ ; GdMgB 5 O 10 :Ce 3+ , Tb 3+ , Mn 2+ ; (Ba,Sr,Ca)MgAl 10 O 17 :Eu 2+ ,Mn 2+ ; Zn 2 (Si,Ge)O 4 :Mn 2+ ; SrAl x O (1+3/2x) :Eu 2+  (x=2−2.4); (Ba,Sr,Ca) 2 SiO 4 :Eu 2+ ; and GdB 3 O 6 :Ce 3+ ,Mn 2+ ; said orange phosphor is selected from the group consisting of (Y,In,Gd,La,Lu,Sc)BO 3 :Eu 3+ ; YVO 4 :Dy 3+ ; GdMgB 5 O 10 :Ce 3+ , Dy 3+ ; (Tb, Y, Lu, La, Gd) 3  (Al,Ga) 5 O 12 :Ce 3+ ; (Ba,Sr,Ca) 5 (PO 4 ) 3 (Cl,F,OH):Eu 2+ ,Mn 2+ , Sb 3+ ; and (Sr,Ba)GdB 8 O 16 :Eu 3+ ; and said red phosphor is selected from the group consisting of (Y,Gd,La,Lu, Sc) 2 O 3 :Eu 3+ ; (Y,Gd, La, In, Lu, Sc)BO 3 :Eu 3+ ; (Y,Gd,La)(Al,Ga)O 3 :Eu 3+ ; (Ba,Sr,Ca)(Y,Gd, La, Lu) 2 O 4 :Eu 3+ ; (Y,Gd)Al 3 B 4 O 12 :Eu 3+ ; monoclinic Gd 2 O 3 :Eu 3+ ; (Gd,Y) 4 (Al,Ga) 2 O 9 :Eu 3+ ; (Ca,Sr)(Gd,Y) 3 (Ge,Si)Al 3 O 9 :Eu 3+ ; YVO 4 :Eu 3+ ; (Y,Gd,La,Lu) 3 GaO 6 :Eu 3+ ; (Sr,Mg) 3 (PO 4 ) 2 :Sn 2+ ; 3.5MgO-0.5MgF 2 —GeO 2 :Mn 4+ ; and GdMgB 5 O 10 :Ce 3+ ,Mn 2+ .  
     
     
         17 . A lamp according to  claim 11  wherein said phosphor blend comprises BaMgAl 10 O 17 :Eu 2+ ; Sr 4 Al 14 O 25 :Eu 2+ ; Zn 2 SiO 4 :Ge 4+ ,Mn 2+ ; and Y 2 O 3 :Eu 2+ .  
     
     
         18 . A lamp according to  claim 11  wherein said phosphor blend comprises (Ba,Sr,Ca) 5 (PO 4 ) 3 (Cl,F,OH):Eu 2+ , Mn 2+ , Sb 3+ ; Sr 4 Al 14 O 25 :Eu 2+ , Zn 2 SiO 4 :Ge 4+ , Mn 2+ ; and Y 2 O 3 :Eu 2+ .  
     
     
         19 . A lamp according to  claim 11 , wherein the spectral weight of the blue phosphor is 0-0.3, the spectral weight of the green phosphor is 0.25-0.6, the spectral weight of the red phosphor is 0-0.55 and the spectral weight of the blue green phosphor is 0-0.3.  
     
     
         20 . A lamp according to  claim 11 , wherein said visible light has predetermined color coordinates on the CIE scale wherein the x value is in the range of 0.3 to 0.4 and y is in the range of 0.3 to 0.4.  
     
     
         21 . An arc discharge lamp having an improved luminosity for a given color rendering index and color coordinated temperature, the lamp comprising 
 a lamp envelope enclosing a discharge space and having an inner surface;    an ionizable medium within said lamp envelope comprising mercury and an inert gas;    first and second electrodes; and    a phosphor layer comprising a phosphor blend on said inner surface, said blend including at least one of each of: a blue phosphor having an emission peak at 440-490 nm, a blue-green phosphor having an emission peak at 475-525 nm, a green phosphor having an emission peak at 515-550 nm, an orange phosphor having an emission peak from 550-600 nm, a deep red phosphor having an emission peak at 615-665 nm, and a red phosphor having an emission peak at 600-670 nm.    
     
     
         22 . A lamp according to  claim 21 , wherein said phosphors are mixed in proportions such that said lamp exhibits a correlated color temperature of between about 3000 to about 10000 K and a color rendering index of about 90 or greater.  
     
     
         23 . A lamp according to  claim 21 , further comprising a UV reflecting barrier layer between said phosphor layer and said lamp envelope.  
     
     
         24 . A lamp according to  claim 21 , wherein said phosphor layer has a median particle size of 1 to 10 microns.  
     
     
         25 . A lamp according to  claim 24 , wherein said thickness of said phosphor layer is 4-6 particles thick.  
     
     
         26 . A lamp according to  claim 21 , wherein said blue phosphor is selected from the group consisting (Ba,Sr,Ca) 5 (PO 4 ) 3 (Cl,F,OH):Eu 2+ , Mn 2+ , Sb 3+ ; (Ba,Sr,Ca)MgAl 10 O 17 :Eu 2+ ,Mn 2+ ; and (Ba,Sr,Ca)BPO 5 :Eu 2+ , Mn 2+ ; said blue-green phosphor is selected from the group consisting of Sr 4 Al 14 O 25 :Eu 2+ ; BaAl 8 O 13 :Eu 2+ ; 2SrO-0.84P 2 O 5−0.16 B 2 O 3 ;Eu 2+ ; MgWO 4 ; BaTiP 2 O 8 ; (Ba,Sr,Ca)MgAl 10 O 17 :Eu 2+ ,Mn 2+ ; (Ba,Sr,Ca) 5 (PO 4 ) 3 (Cl,F,OH):Eu 2+ ,Mn 2+ , Sb 3+ ; said green phosphor is selected from the group consisting of LaPO 4 :Ce 3+ , Tb 3+ ; CeMgAl 11 O 19 :Tb 3+ ; GdMgB 5 O 10 :Ce 3+ , Tb 3+ , Mn 2+ ; (Ba,Sr,Ca)MgAl 10 O 17 :Eu 2+ , Mn 2+ ; Zn 2 (Si,Ge)O 4 :Mn 2+ ; SrAl x O (1+3/2x) :Eu 2+  (x=2−2.4); (Ba,Sr,Ca) 2 SiO 4 :Eu 2+ ; and GdB 3 O 6 :Ce 3+ ,Mn 2+ ; said orange phosphor is selected from the group consisting of (Y,In,Gd,La,Lu,Sc)BO 3 :Eu 3+ ; YVO 4 :Dy 3+ ; GdMgB 5 O 10 :Ce 3+ , Dy 3+ ; (Tb, Y, Lu, La, Gd) 3  (Al,Ga) 5 O 12 :Ce 3+ ; (Ba,Sr,Ca) 5 (PO 4 ) 3 (Cl,F,OH):Eu 2+ , Sb 3+ ; and (Sr,Ba)GdB 8 O 16 :Eu 3+ ; said red phosphor is selected from the group consisting of (Y,Gd,La,Lu, Sc) 2 O 3 :Eu 3+ ; (Y,Gd, La, In, Lu, Sc)BO 3 :Eu 3+ ; (Y,Gd,La)(Al,Ga)O 3 :Eu 3+ ; (Ba,Sr,Ca)(Y,Gd, La, Lu) 2 O 4 :Eu 3+ ; (Y,Gd)Al 3 B 4 O 12 :Eu 3+ ; monoclinic Gd 2 O 3 :Eu 3+ ; (Gd,Y) 4 (Al,Ga) 2 O 9 :Eu 3+ ; (Ca,Sr)(Gd,Y) 3 (Ge,Si)Al 3 O 9 :Eu 3+ ; YVO 4 :Eu 3+ ; (Y,Gd,La,Lu) 3 GaO 6 :Eu 3+ ; (Sr,Mg) 3 (PO 4 ) 2 :Sn 2+ ; 3.5MgO-0.5MgF 2 —GeO 2 :Mn 4+ ; and GdMgB 5 O 10 :Ce 3+ ,Mn 2+ ; and said deep red phosphor is selected from the group consisting of (Sr,Mg) 3 (PO 4 ) 2 :Sn 2+ ; 3.5MgO-0.5MgF 2 —GeO 2 :Mn 4+ ; and GdMgB 5 O 10 Ce 3+ ,Mn 2+ .  
     
     
         27 . A lamp according to  claim 21 , wherein said phosphor blend comprises BaMgAl 10 O 17 :Eu 2+ , Sr 4 Al 14 O 25 :Eu 2+ ; Zn 2 SiO 4 :Ge 4+ ; Y 3 :Eu 2+  and an additional orange and deep red phosphor.  
     
     
         28 . A lamp according to  claim 21 , wherein said phosphor blend comprises (Ba,Sr,Ca) 5 (PO 4 ) 3 (Cl,F,OH):Eu 2+ , Mn 2+ , Sb 3+ ; Zn 2 SiO 4 :Ge 4+ ,Mn 2+ ; Y 2 O 3 :Eu 2+  and an additional orange and deep red phosphor.  
     
     
         29 . A lamp according to  claim 21 , wherein the spectral weight of the blue phosphor is 0-0.3, the spectral weight of the green phosphor is 0.25-0.6, the spectral weight of the red phosphor is 0-0.55, the spectral weight of the blue green phosphor is 0-0.3, the spectral weight of the orange phosphor is 0.55, and the spectral weight of the deep red phosphor is 0-0.3.  
     
     
         30 . A lamp according to  claim 21 , wherein said visible light has predetermined color coordinates on the CIE scale wherein the x value is in the range of 0.3 to 0.4 and y is in the range of 0.3 to 0.4.