Luminescence properties of SrIn2O4:Eu3+ incorporated with Gd3+ or Sm3+ ions

The photoluminescence (PL) properties of SrIn2O4:Eu3+,Gd3+ and SrIn2O4:Eu3+,Sm3+ are investigated in this work. When the Gd3+ ions are introduced in this compound, the average distance metal-oxygen is increased, and then the vibration of lattice is decreased. It results in that the nonradiation of Eu3+ is decreased. Therefore, the emissions of SrIn2O4:Eu3+ are increased. However, little of energy transfer occurs from Gd3+ to Eu3+ ions. When the Sm3+ ions are introduced into SrIn2O4:Eu3+, the energy transfers occur from the CTS of O2−–Sm3+ to Sm3+ and Eu3+ ions, from the host absorption to Eu3+ ions, and from Sm3+ to Eu3+ ions, but not from the host absorption to Sm3+ ions.

Research highlights▶ The emission intensity of SrIn2O4:Eu3+ is increased with incorporation of Gd3+ ions ▶ Little energy transfer occurs from Gd3+ to Eu3+ ▶ With incorporation of Sm3+, energy transfer occurs from Sm3+ to Eu3+ in SrIn2O4:Eu3+.