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

Area of Science:

• Materials Science
• Solid-state Chemistry
• Luminescence

Background:

• Strontium magnesium silicate (Sr2MgSi2O7) is a host material with potential for luminescent applications.
• Doping with rare-earth ions like Tb3+ and Eu3+ can induce desirable optical properties.

Purpose of the Study:

• To synthesize and characterize Tb3+, Eu3+-doped Sr2MgSi2O7 (SMSO) phosphors.
• To investigate the luminescence properties, energy transfer mechanisms, and potential for white light emission.

Main Methods:

• High-temperature solid-state reaction for phosphor synthesis.
• X-ray diffraction (XRD) and Rietveld refinement for structural analysis.
• Photoluminescence (PL) spectra and luminescence decay curves for optical characterization.

Main Results:

• Tb3+ single-doped SMSO shows intense green emission with dipole-dipole concentration quenching.
• Efficient energy transfer from Tb3+ to Eu3+ was observed in co-doped samples, attributed to quadrupole-quadrupole interaction.
• Tunable white light emission achieved by adjusting the Tb3+/Eu3+ concentration ratio.
• Critical energy transfer distance calculated as 6.7 Å.

Conclusions:

• SMSO:Tb3+, Eu3+ phosphors demonstrate efficient energy transfer and tunable white light emission.
• The synthesized material is a promising single-component phosphor for white light emitting applications.