PHOSPHORS

Rare Earth Phosphors

Luminescent materials are widely used for lighting (fluorescent lamps), displays (liquid crystal displays, plasma televisions), lasers (DVD players), and medical diagnoses (positron emission tomography). Rare earths are used extensively in these devices because of their intrinsic properties, which derive from their unpaired 4f electrons. Lanthanum, yttrium, cerium, europium, and terbium are widely used for lighting devices and displays; ytterbium and neodymium for lasers; erbium for optical fiber amplification; and gadolinium, cerium, lutetium, and terbium in medical devices. For displays and lighting devices, the most common emitters are Eu3 + (red), Tb3 + (green), and Eu2 + (blue). These, in combination give most colors of the rainbow.
 
RE Blue Phosphor
Code Chemical Formula Color Coordinates Relative Brightness Real Density (g/cm3) Bulk Density (g/cm3) Medium Particle Size d 50(by C-C) (µm) Peak Emission (µm) FWHM (µm) Exciting Wave Length (µm)
B1 BaMgAl10O17:Eu x=0.150±0.005; y=0.070±0.01 >= 100% 3.8±0.1 0.70±0.01 <= 8.0 450±5 50±5  
B2 BaMgAl10O17:Eu2+, Mn2+ x=0.150±0.005; y=0.135±0.02 >= 100% 3.9±0.1 0.70±0.01 <= 8.0 450±5, 515±5 50±5  
B3 (SrBaCa)10(PO4)6Cl2:Eu x=0.150±0.005; y=0.060~0.150 >= 100% 4.2±0.1 1.0±0.1 <= 6.0 450±5 30~90  
B4 BaMgAl10O17:Eu2+           450±5   370~420
 
RE Cyan Phosphor
Code Chemical Formula Color Coordinates Relative Brightness Peak Emission (µm) FWHM (µm)
BG Sr4Al14O25:Eu x=0.151±0.005; y=0.390±0.01 >= 100% 493±5 65±5
 
RE Green Phosphor
Code Chemical Formula Color Coordinates Relative Brightness Real Density (g/cm3) Bulk Density (g/cm3) Medium Particle Size d 50(by C-C) (µm) Peak Emission (µm) FWHM (µm) Exciting Wave Length (µm)
G1 (Ce,Tb)MgAl11O19 x=0.330±0.005; y=0.595±0.005 >= 100% 4.2±0.1 0.85±0.1 <= 8.0 545±5    
G2 (LaCeTb)PO4 x=0.344±0.005; y=0.582±0.005 >= 100% 5.2±0.1 0.85±0.1 <= 6.0 540±5    
G3 BaMgAl10O17:Eu2+Mn2+   >= 100%       515±5   370~420
G4 ZnSiO4:Mn2+ x=0.24±0.01; y=0.70±0.01 >= 100%       525±5 40  
 
RE Red Phosphor
Code Chemical Formula Color Coordinates Relative Brightness Real Density (g/cm3) Bulk Density (g/cm3) Medium Particle Size d 50(by C-C) (µm) Peak Emission (µm) FWHM (µm) Exciting Wave Length (µm)
R1 Y2O3:Eu x=0.645±0.005; y=0.345±0.005 >= 100% 5.1±0.1 0.75±0.1 <= 7.0 611    
R2 Y(PV)O4 x=0.665±0.005; y=0.330±0.005 >= 99% 4.3±0.2 <= 0.9 <= 7.0 620±5    
R3 LiEuW2O8   >= 100%       614±5   370~410, 470, 536
 
RE Yellow Phosphor
Code Chemical Formula Color Coordinates Relative Brightness Medium Particle Size d 50(by C-C) (µm) Peak Emission (µm) Excited Wave Length (µm)
YAG (YGdCe)3Al5O12:Eu x=0.145±0.005; y=0.440±0.005 >= 100% <= 8.0 550~575 460
 
RE Trichromatic Phosphor
Code Color Coordinates Medium Particle Size (by C-C) (µm) Color temperature of powder (K) Ra/Color Rendering Index
27 x=0.502±0.005; y=0.447±0.005 <= 6.0 2450±50 >= 82
29 x=0.487±0.005; y=0.446±0.005 <= 6.0 2600±100 >= 82
45 x=0.386±0.005; y=0.398±0.005 <= 6.5 4150±100 >= 82
50 x=0.362±0.005; y=0.385±0.005 <= 7.0 4600±100 >= 82
65 x=0.320±0.005; y=0.350±0.005 <= 7.0 6000±100 >= 84
 
RE Long Afterglow Phosphor
Code Chemical Formula Peak Emission (µm) Prime Brightness (cd/m2) Final Brightness (one hour) (m cd/m2)
LA1 SrAl2O4:Eu,Dy 520 3.25 300
LA2 Sr4Al14O25:Eu,Dy 490 2.5 300

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