Presentation Information
[22a-12A-11]Structural and photoluminescent analysis of samarium-doped novel niobate-based phosphors for w-LED
〇(DC)Kanishk Poria1, Nisha Deopa2, Jangvir Singh Shahi1 (1.Panjab Univ., 2.Ch. Ranbir Singh Univ.)
Keywords:
phosphors,samarium,w-LED
Phosphors, materials that emit light when stimulated by UV radiation or electron bombardment, consist of a host matrix and activator ions functioning as luminescent centers. Commonly used rare earth elements like Eu3+, Sm3+, Dy3+, and Tm3+ serve as activators.
Phosphor preparation involved synthesizing samarium-doped niobate-based phosphors with varying concentrations using a high-temperature solid-state reaction. High-quality raw materials were meticulously mixed, milled, and calcinated.Characterization techniques included X-ray diffraction (XRD) analysis to examine structural parameters and steady-state photoluminescence (PL) spectra to assess photoluminescence properties. The emission spectra were utilized to calculate and plot CIE 1931 chromaticity coordinates.XRD analysis confirmed the filled tetragonal tungsten bronze (TTB) structure, unaffected by samarium ion inclusion. The substitution of Sm3+ for La3+ was determined based on ionic radii percentage differences.Photoluminescence (PL) spectra revealed distinct excitation and emission peaks corresponding to Sm3+ transitions. The optimized concentration of Sm3+ was identified as 7.0 mol%, as concentrations beyond led to concentration quenching.CIE chromaticity coordinates demonstrated high color purity (98.5% to 99.0%), suggesting potential applications in various commercial settings. The study provides insights into the synthesis and properties of samarium-doped niobate-based phosphors for optoelectronic applications.
Phosphor preparation involved synthesizing samarium-doped niobate-based phosphors with varying concentrations using a high-temperature solid-state reaction. High-quality raw materials were meticulously mixed, milled, and calcinated.Characterization techniques included X-ray diffraction (XRD) analysis to examine structural parameters and steady-state photoluminescence (PL) spectra to assess photoluminescence properties. The emission spectra were utilized to calculate and plot CIE 1931 chromaticity coordinates.XRD analysis confirmed the filled tetragonal tungsten bronze (TTB) structure, unaffected by samarium ion inclusion. The substitution of Sm3+ for La3+ was determined based on ionic radii percentage differences.Photoluminescence (PL) spectra revealed distinct excitation and emission peaks corresponding to Sm3+ transitions. The optimized concentration of Sm3+ was identified as 7.0 mol%, as concentrations beyond led to concentration quenching.CIE chromaticity coordinates demonstrated high color purity (98.5% to 99.0%), suggesting potential applications in various commercial settings. The study provides insights into the synthesis and properties of samarium-doped niobate-based phosphors for optoelectronic applications.