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ZnAl2O4:Eu3+ or Tb3+ (1 mol%) and ZnAl2O4:Eu3+/Tb3+ with varied concentrations of Eu3+ and Tb3+ were prepared by solution combustion method. The photoluminescence spectra of synthesized compounds shows that simultaneous doping of Tb3+ and Eu3+ causes enhancement in Eu3+ luminescence intensity. This indicates some energy transfer from Tb3+ to Eu3+. This phenomenon of Tb3+ → Eu3+ energy transfer, accomplishing...
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