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Rare‐earth materials for use in the dark
Author(s) -
Zhang Tianzhi,
Su Qiang
Publication year - 2000
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.1828695
Subject(s) - astrobiology , earth (classical element) , dark matter , astronomy , computer science , physics
— Recently, it was found that some materials doped with rare‐earth ions show bright and long‐lasting phosphorescence. They do not include radioactive elements and can be safely used as luminous paints for use in the dark. Some of them are better than the traditional zinc sulfide doped with copper (ZnS:Cu). The most important rare‐earth materials with long‐lasting phosphorescence are aluminates such as alkaline‐earth aluminates MAl 2 O 4 :Eu 2+ , Dy 3+ (M = Sr, Ca) and garnets Y 3 Ga 5 O 12 :Tb 3+ , Gd 3 Ga 5 O 12 :Tb 3+ , Cd 3 Al 2 Ge 3 O 12 :Tb 3+ , Cd 3 M 2 Ge 3 O 12 :Pr 3+ (M = Al, Ge), Y 3 Al 5−x Ga x O 12 :Ce 3+ ( x = 3, 3.5). Some oxides such as InBO 3 :Tb 3+ , Ba 2 SiO 4 :Dy 3+ also show long‐lasting phosphorescence properties. Other sulfide materials include ZnS:Eu, Ca x Sr 1−x S:Bi, Tm, Cu or Ca x Sr 1−x S:Eu. Alkaline‐earth aluminates MAl 2 O 4 :Eu 2+ (M = Mg, Ca, Sr, Ba) codoped with RE 3+ (RE = Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) were synthesized by using homogeneous precipitation method.