Abstract
The spectroscopic characterization of yttria, singly and doubly doped with Ln3+ (Ln=Sm, Eu, Dy, Er, Ho) and Bi3+ ions, is performed through excitation spectra, emission spectra and decay time measurements. The obtained spectroscopic data clearly indicate that energy transfer takes place from Bi3+ to Ln3+ ions. The energy transfer efficiency of Bi3+→Ln3+ and quantum efficiency of Ln3+ were calculated. Upon excitation of 370nm (Bi3+ excitation band), the quantum efficiency of Ln3+ varies from ∼4% to ∼44%. The energy transfer efficiency increases continuously with increasing Ln3+ concentrations, whereas the variation of the quantum efficiency of Ln3+ is complicated. The quantum efficiency of Ln3+ is discussed in terms of electron transfer and cross relaxation.
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