Near-white-emitting phosphors based on tungstate for phosphor-converted light-emitting diodes

Area of Science:

• Materials Science
• Solid-State Chemistry
• Luminescence

Background:

• Barium tungstate (BaWO(4)) is a promising host material for phosphors.
• Tuning luminescence properties is crucial for developing advanced lighting solutions.
• Rare-earth element doping is a common strategy to modify phosphor characteristics.

Purpose of the Study:

• To synthesize barium tungstate phosphors doped with dysprosium (Dy(3+)) and strontium (Sr(2+)).
• To investigate the impact of Dy(3+) and Sr(2+) doping concentrations on structural and photoluminescence properties.
• To evaluate the potential of these phosphors for near-white light-emitting diode (LED) applications.

Main Methods:

• Solid-state reaction method for phosphor synthesis.
• X-ray diffraction (XRD) for structural analysis.
• Photoluminescence (PL) spectroscopy to study emission properties.
• CIE parameter estimation to assess white light quality.

Main Results:

• Tetragonal structure (space group I4(1)/a) confirmed by XRD.
• PL emission spectra displayed tunable blue and yellow peaks.
• Near-white light emission was achieved by adjusting doping concentrations.
• CIE parameters indicated good quality white light.

Conclusions:

• The synthesized BaWO(4):Dy(3+)/Sr(2+) phosphors possess tunable luminescence.
• The phosphors effectively produce near-white light suitable for illumination.
• These barium tungstate-based phosphors are viable candidates for near-white LED applications.