Some common long afterglow materials and afterglow time

Long afterglow material Main peak Time color
SrAl2O4:Eu,Dy 520nm >60h green
CaAl2O4:Eu,Nd 450nm >20h blue
Sr4Al14O25:Eu,Dy 486nm >30h blue
Sr2MgSi2O7:Eu,Dy 466nm >20h blue
Ca2MgSi2O7:Eu,Dy 545nm >20h green
MgSiO3:Mn, Eu,Dy 644nm ~4h red
Cd2Ge7O16:Mn 585nm >3h orange
MgSnO4:Mn 499nm >5h green
Zn3Ga2Ge2O10:Cr 700nm >360h red