Orange light-emitting Ca₃ Mg₃ (PO₄ )₄ :Sm³⁺ phosphors

Area of Science:

• Materials Science
• Solid-State Chemistry
• Luminescence

Background:

• Phosphors are crucial for lighting applications, particularly for generating specific colors.
• Samarium (Sm3+)-doped materials are known for their luminescence properties, often emitting in the orange-red region.
• Developing efficient orange-emitting phosphors is important for advancing light-emitting diode (LED) technology.

Purpose of the Study:

• To synthesize and characterize novel Ca3Mg3(PO4)4:Sm3+ phosphors.
• To investigate the photoluminescence properties of these phosphors under near-ultraviolet (NUV) and blue light excitation.
• To evaluate their potential application in orange light-emitting diodes (LEDs).

Main Methods:

• Combustion synthesis method for phosphor preparation.
• X-ray diffraction (XRD) for phase formation analysis.
• Scanning electron microscopy (SEM) for morphology studies.
• Photoluminescence spectroscopy to determine emission spectra and characteristics.

Main Results:

• Successful synthesis of Ca3Mg3(PO4)4:Sm3+ phosphors.
• Observation of orange light emission upon excitation with near-ultraviolet (NUV) and blue light.
• Emission spectra showed characteristic Sm3+ transitions (4G5/2 → 6H5/2, 6H7/2, 6H9/2).
• Electric dipole-dipole interaction identified as the mechanism for concentration quenching.

Conclusions:

• The synthesized Ca3Mg3(PO4)4:Sm3+ phosphors exhibit promising orange luminescence.
• Their optical properties make them suitable candidates for orange LEDs.
• The combustion synthesis route is effective for producing these luminescent materials.