Tunable Luminescence in Sr2MgSi2O7:Tb3+ Eu3+Phosphors Based on Energy Transfer

摘要

A series of Tb³⁺, Eu³⁺-doped Sr2MgSi2O7 (SMSO) phosphors were synthesized by high temperature solid-state reaction. X-ray diffraction (XRD) patterns, Rietveld refinement, photoluminescence spectra (PL), and luminescence decay curves were utilized to characterize each sample’s properties. Intense green emission due to Tb^{3+ 5}D4→⁷F5 transition was observed in the Tb³⁺ single-doped SMSO sample, and the corresponding concentration quenching mechanism was demonstrated to be a diople-diople interaction. A wide overlap between Tb³⁺ emission and Eu³⁺ excitationspectraresults in energy transfer from Tb³⁺ to Eu³⁺. This has been demonstrated by the emission spectra and decay curves of Tb³⁺ in SMSO:Tb³⁺, Eu³⁺ phosphors. Energy transfer mechanism was determined to be a quadrupole-quadrupole interaction. And critical distance of energy transfer from Tb³⁺ to Eu³⁺ ions is calculated to be 6.7 Å on the basis of concentration quenching method. Moreover, white light emission was generated via adjusting concentration ratio of Tb³⁺ and Eu³⁺ in SMSO:Tb³⁺, Eu³⁺ phosphors. All the results indicate that SMSO:Tb³⁺, Eu³⁺ is a promising single-component white light emitting phosphor.