UV-excited red-emitting phosphor Eu3+-activated Ca9Y(PO4)7

Area of Science:

• Materials Science
• Solid-State Chemistry
• Luminescence

Background:

• Development of efficient red-emitting phosphors is crucial for advanced display technologies and solid-state lighting.
• Europium (Eu(3+)) ions are widely used activators in phosphors due to their characteristic red emission.
• Calcium yttrium phosphate (Ca(9)Y(PO(4))(7)) is explored as a host material for phosphors.

Purpose of the Study:

• To synthesize and characterize a novel red-emitting phosphor based on Ca(9)Y(PO(4))(7):Eu(3+).
• To investigate the structural and photoluminescent properties of the synthesized phosphor.
• To evaluate its potential for applications in display devices and white light-emitting diodes (w-LEDs).

Main Methods:

• Solid-state reaction method at high temperatures for phosphor synthesis.
• X-ray diffraction (XRD) for phase purity and structural analysis.
• Photoluminescence (PL) spectroscopy to study excitation and emission properties, including optimal doping concentration and transition intensities.

Main Results:

• Ca(9)Y(PO(4))(7) doped with 3mol% Eu(3+) (Ca(9)Y(0.97)(PO(4))(7):0.03Eu(3+)) was confirmed to be a pure orthorhombic phase.
• The electric dipole transition ((5)D(0)→(7)F(2)) at 613nm was dominant over the magnetic dipole transition ((5)D(0)→(7)F(1)) at 594nm.
• The synthesized phosphor showed approximately twice the integral emission intensity compared to commercial Y(2)O(3):Eu(3+) phosphor when excited at 392nm, with 3mol% Eu(3+) being the optimal concentration.

Conclusions:

• Ca(9)Y(0.97)(PO(4))(7):0.03Eu(3+) is a promising red-emitting phosphor with excellent luminescence properties.
• Its high emission intensity and favorable spectral characteristics make it suitable for potential applications in display devices and w-LEDs.
• Further research into optimizing synthesis and device integration is warranted.