Triple molybdate scheelite-type upconversion phosphor NaCaLa(MoO₄)₃:Er³⁺/Yb³⁺: structural and spectroscopic...

Area of Science:

• Materials Science
• Solid-State Chemistry
• Luminescence

Background:

• Rare-earth-doped phosphors are crucial for optical applications.
• Molybdate materials offer unique structural and optical properties.
• Upconversion luminescence allows for the conversion of lower-energy photons to higher-energy ones.

Purpose of the Study:

• To synthesize novel triple molybdate phosphors NaCaLa(MoO4)3 doped with Er3+ and Yb3+ for the first time.
• To investigate the structural, morphological, and optical properties of these synthesized phosphors.
• To explore their potential for upconversion luminescence applications.

Main Methods:

• Microwave sol-gel method for phosphor synthesis.
• Heat treatment at 900 °C for 16 hours to ensure crystallization.
• Rietveld refinement for structural analysis.
• Photoluminescence emission and Raman spectroscopy for optical property evaluation.

Main Results:

• Successfully synthesized NaCaLa(MoO4)3:xEr3+,yYb3+ phosphors with well-crystallized, homogeneous morphology (2-3 μm particles).
• Observed strong green (525 nm, 550 nm) and weak red, blue, and violet emissions under 980 nm excitation.
• Detailed evaluation of pump power dependence and Commission Internationale de L'Eclairage chromaticity.

Conclusions:

• The microwave sol-gel method is effective for synthesizing novel triple molybdate phosphors.
• The synthesized phosphors exhibit promising upconversion luminescence properties.
• These materials hold potential for various optical and photonic applications.