Abstract:

Yttrium orthotantalate co doped by Eu 3+ and Gd 3+ has been synthesized by solid state method. The emission and excitation spectra of YTaO4: Gd, Eu are studied in detail. In the excitation spectra of Eu 3+5D 0→ 7F2 transition emission in YTaO4:Gd, Eu, there appear excitations of Gd3+ and TaO43- group, which indicate energy transfer from Gd 3+ and TaO4 3-  group to Eu 3+ in the process of luminescence. The excitation spectra of Gd 3+ emission(λ=312 5 nm) including strong excitation of charge transfer of group show energy transfer from host lattice to Gd 3+ . So there are two ways of energy transfer in YTaO4:Gd,Eu system. The strong evidences from excitation spectra, emission spectra and diffusive reflection spectra of this system show that Gd 3+ can play an intermediate role in the process of luminescence. There is energy transfer from TaO 3- 4 to Gd 3+ and finally to Eu 3+ via the charge transfer state and spectral overlap. The energy transfer from TaO 3- 4 to Gd 3+ is a dominating process in this system. 

Key words: Luminescence, Tantalate, Rare earth