Abstract
We investigate the luminescence properties of Bi3+ and RE3+ (RE = Tb or Eu) in a Y3Ga5O12 (YGG) host system. The additional doping of Bi3+ can enhance the luminescence of Tb3+ or Eu3+ in this host. Energy transfer from Bi3+ to Tb3+ and Eu3+ is observed and the mechanism of energy transfer is investigated. Mechanism of energy transfer can be explained as electric multipole interaction since the Bi3+ emission band and Tb3+ or Eu3+ excitation band overlaps and the Bi3+ emission intensity decreases while the intensity of Tb3+ or Eu3+ increases with the increase of Tb3+ or Eu3+ concentration. Therefore, Bi3+ ion is a kind of efficient sensitizer to the Tb3+ and Eu3+ activators in the Y3Ga5O12 host.
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