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The long afterglow and bluish white emission of red emitting material Zn3Al2Ge2O10:Cr3+ are induced by introducing Ca2+. Under excitation of 400nm, Zn3Al2Ge2O10:Cr3+ can emit a red emission band at 694nm in the range of 650–750nm that is caused by 2E→4A2 transition of Cr3+. Under 262nm excitation, Zn3Al2Ge2O10:Cr3+ can produce a weakly broad emission band in the range of 350–600nm, and the emission...
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