An efficient orange-red-emitting LiNa₃ P₂ O₇ :Sm³⁺ pyrophosphate: Structural and optical analysis for solid-state...

Area of Science:

• Materials Science
• Solid-State Chemistry
• Luminescence

Background:

• Rare-earth doped phosphors are crucial for lighting and display technologies.
• Lithium sodium pyrophosphate (LiNa₃ P₂ O₇) is an emerging host material for phosphors.

Purpose of the Study:

• To synthesize and characterize samarium (Sm³⁺)-doped LiNa₃ P₂ O₇ (LNPO) phosphors.
• To investigate the luminescent properties of Sm³⁺ ions in the LNPO host matrix.

Main Methods:

• High-temperature solid-state reaction route for phosphor synthesis.
• X-ray diffraction (XRD) for phase analysis.
• X-ray photoelectron spectroscopy (XPS) for surface state characterization.
• Photoluminescence spectroscopy for emission properties.

Main Results:

• A predominant orthorhombic phase of LNPO was confirmed by XRD.
• Sm³⁺-doped LNPO phosphors exhibited sharp emission peaks at 563, 600, and 647 nm under 401 nm excitation, attributed to Sm³⁺ f-f transitions.
• Optimal Sm³⁺ concentration (9 mol%) yielded specific Commission Internationale de l'Eclairage (CIE) chromaticity coordinates, a color rendering index (CRI) of 42, and a correlated color temperature (CCT) of 1843 K.

Conclusions:

• The synthesized Sm³⁺-doped LNPO phosphor is a promising material for luminescence applications.
• The observed sharp emission lines indicate potential for narrow-band light emission.
• Further research can explore tuning the optical properties for specific applications.