New Multicolor Tungstate-Molybdate Microphosphors as an Alternative to LED Components

Area of Science:

• Materials Science
• Solid-State Chemistry
• Luminescence

Background:

• Developing phosphors with specific emission colors is essential for advanced light-emitting diode (LED) technologies.
• Tailoring phosphor properties requires precise control over composition and dopant ion concentrations.

Purpose of the Study:

• To synthesize and characterize novel multicolour microphosphors based on CaMo_yW_1-yO₄ co-doped with Tb³⁺ and Eu³⁺.
• To investigate the impact of varying dopant concentrations (Eu³⁺_x/Tb³⁺_1-x) on the structural, morphological, and luminescent properties of the synthesized phosphors.

Main Methods:

• High-temperature solid-state synthesis method was employed to prepare the phosphors.
• X-ray diffraction (XRD) was used to confirm the crystal structure and phase purity.
• Scanning electron microscopy (SEM) analyzed particle morphology and size.
• Luminescence spectroscopy, including excitation/emission spectra and decay lifetimes, characterized optical properties.
• 1931 Commission Internationale de l'Eclairage (CIE) chromaticity coordinates and color correlated temperature (CCT) evaluated emission color tuning.

Main Results:

• The synthesized materials exhibited a pure tetragonal crystal structure (space group I4₁/a).
• SEM analysis revealed the particle size and morphology.
• Luminescence spectroscopy confirmed tunable visible emissions.
• The emission color was successfully tuned from green-yellow to orange-red by adjusting dopant concentrations.

Conclusions:

• The developed CaMo_yW_1-yO₄:Eu³⁺_x/Tb³⁺_1-x phosphors possess desirable structural and luminescent properties.
• The tunable emission characteristics make these phosphors promising candidates for multicolour LED applications.
• The study demonstrates effective control over phosphor emission color through compositional engineering.