A novel orange emitting long afterglow phosphor Ca_3Si_2O_7:Eu~(2+) and the enhancement by R~(3+) ions (R=Tm, Dy and Er)

摘要

A novel orange emitting long afterglow phosphor Ca_3Si_2O_7:Eu~(2+) was prepared successfully via a traditional high temperature solid-state reaction method. The co-doping of Tm~(3+), Dy~(3+) and Er~(3+) ions into Ca_3Si_2O_7:Eu~(2+) separately can increase the trap density and/or produce new traps with suitable depth. They can enhance the brightness of afterglow and prolong the afterglow duration significantly. The duration of Eu~(2+) solely doped and Eu~(2+), Tm~(3+) co-doped _3Si_2O_7 phosphors can last 100 s and more than 15 min, respectively. Both the samples co-doped by Dy~(3+) and Er~(3+) can last more than 10 min. The mechanism of afterglow was discussed briefly.