Novel Red-Emitting Eu³⁺-Doped Y₂(W_xMo_1-xO₄)₃ Phosphor with High Conversion Efficiency for Lighting and Display...

Area of Science:

• Materials Science
• Solid-State Chemistry
• Luminescence

Background:

• Trivalent europium (Eu3+) doping is crucial for developing efficient phosphors.
• Tungstate and molybdate hosts offer tunable optical properties.
• Controlling synthesis parameters is key to optimizing material performance.

Purpose of the Study:

• To investigate the influence of W/Mo ratio and calcination temperature on the crystal structure and photoluminescence of Eu3+-doped tungstates and molybdates.
• To correlate structural properties with photoluminescence characteristics, including internal and external quantum efficiency.
• To identify optimal synthesis conditions for enhanced luminescence.

Main Methods:

• Improved sol-gel and high-temperature solid-state reaction synthesis.
• Characterization of crystal structure using X-ray diffraction (XRD).
• Photoluminescence spectroscopy to determine quantum efficiency and spectral properties.

Main Results:

• Crystal structure (monoclinic vs. tetragonal) is dependent on W/Mo ratio and calcination temperature.
• Eu3+-doped samples with tetragonal structures exhibit higher internal quantum efficiency than monoclinic ones.
• Smaller grain sizes correlate with higher internal quantum efficiency, while external quantum efficiency peaks at 900 °C.

Conclusions:

• Synthesis parameters critically influence the crystal structure and luminescence of Eu3+-doped tungstate/molybdate systems.
• Tetragonal phase and smaller grain sizes are favorable for higher internal quantum efficiency.
• Optimized processing yields enhanced photoluminescence, relevant for phosphor development.