An orange-emitting, long-persistent phosphor,
Ca2Si5normalN8:Eu2+,Tm3+
, was developed. Afterglow of this phosphor decays more slowly than that of the conventional red-emitting, long-persistent phosphor,
normalY2normalO2S:Eu3+,Ti,Mg
. After 420 nm excitation, the afterglow luminance is initially lower, but, after 8 min, gets higher than luminance of
normalY2normalO2S:Eu3+,Ti,Mg
. Long afterglow results from electron traps formed by
Tm3+
at the
Ca2+
site. The origin of two main thermoluminescence glow peaks at 220 and 350 K is discussed based on their dependence on Eu or Tm concentration and Ca/Si atomic ratio. Increased thermoluminescence intensity is observed by excitation in
Eu2+
4f-5d transition at room temperature followed by the fundamental absorption of the host at low temperature.
A new orange-emitting, long-persistent phosphor, Ca 2 Si 5 N 8 :Eu 2+ ,Tm 3+ , was developed. Long afterglow results from electron traps formed by Tm 3+ at Ca 2+ site. Origin of two main thermoluminescence (TL) glow peaks at 220K and 350K is discussed based on their dependence on Eu or Tm concentration and Ca/Si atomic ratio. Enhancement of TL is observed by excitation in Eu 2+ 4f-5d transition at room temperature followed by the fundamental absorption of the host at low temperature.
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