Phosphor materials doped with rare-earth ions have gained significant attention for their potential applications in solid-state lighting and display technologies. However, achieving high color purity and efficient luminescence is challenging. To address this limitation, we synthesized a series of Sm3+-doped Ca3La3(BO3)5 phosphors (Ca3La3(BO3)5:xSm3+; x = 0.005, 0.01, 0.03, 0.05, 0.07, 0.09, 0.11, or 0.13 mol) via a sol–gel method. The structural and luminescence properties of the Ca3La3(BO3)5:xSm3+ phosphors were analyzed by x-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and photoluminescence (PL) measurements. XRD analyses confirmed that the phosphors possess a hexagonal crystal structure. FT-IR spectroscopy confirmed the presence of BO3 groups, with characteristic B–O stretching vibrations observed in the 1500–1000 cm−1 range and B–O–B bending modes at 520, 616, and 741 cm−1. These findings confirm the structural integrity of the borate network in Ca3La3(BO3)5:xSm3+ phosphors. The optical energy bandgap was estimated using diffuse reflectance spectroscopy. The PL excitation band was identified as the charge-transfer band of Sm3+. The emission spectra revealed three distinct peaks in the 500–750 nm range, corresponding to the 4G5/2 → 6HJ (J = 5/2, 7/2, or 9/2) transitions of Sm3+. The intensity of the peaks in the PL spectra of Ca3La3(BO3)5:xSm3+ increased as x increased up to 0.03 mol but decreased at higher x values. Analyses based on Judd–Ofelt theory and optical absorption data indicate that the synthesized phosphors exhibit significant emission cross-sections and effective line widths. Under 401 nm excitation, the Ca3La3(BO3)5:0.03Sm3+ phosphor exhibited high color purity (82–90%) and favorable Commission Internationale de l’Éclairage coordinates, highlighting its potential as an orange–red emitter. These findings highlight the potential of the phosphors for high-performance solid-state lighting and optoelectronic applications, providing a promising alternative to existing phosphors.

Luminescence Properties and Judd–Ofelt Analysis of Orange–Red-Emitting Ca₃La₃(BO₃)₅:Sm³⁺ Phosphor

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发表日期：

2026年5月11日

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Vijay Singh,
Ramasamy Shanmugam,
Sk. Mahamuda,
M. Radha,
M. Seshadri,
K. Swapna,
A. S. Rao,
M. M. Haidari,
Ji Bong Joo,
Jung-Kul Lee,
In-Won Kim

摘要

Phosphor materials doped with rare-earth ions have gained significant attention for their potential applications in solid-state lighting and display technologies. However, achieving high color purity and efficient luminescence is challenging. To address this limitation, we synthesized a series of Sm³⁺-doped Ca₃La₃(BO₃)₅ phosphors (Ca₃La₃(BO₃)₅:xSm³⁺; x = 0.005, 0.01, 0.03, 0.05, 0.07, 0.09, 0.11, or 0.13 mol) via a sol–gel method. The structural and luminescence properties of the Ca₃La₃(BO₃)₅:xSm³⁺ phosphors were analyzed by x-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and photoluminescence (PL) measurements. XRD analyses confirmed that the phosphors possess a hexagonal crystal structure. FT-IR spectroscopy confirmed the presence of BO₃ groups, with characteristic B–O stretching vibrations observed in the 1500–1000 cm⁻¹ range and B–O–B bending modes at 520, 616, and 741 cm⁻¹. These findings confirm the structural integrity of the borate network in Ca₃La₃(BO₃)₅:xSm³⁺ phosphors. The optical energy bandgap was estimated using diffuse reflectance spectroscopy. The PL excitation band was identified as the charge-transfer band of Sm³⁺. The emission spectra revealed three distinct peaks in the 500–750 nm range, corresponding to the ⁴G_5/2 → ⁶H_J (J = 5/2, 7/2, or 9/2) transitions of Sm³⁺. The intensity of the peaks in the PL spectra of Ca₃La₃(BO₃)₅:xSm³⁺ increased as x increased up to 0.03 mol but decreased at higher x values. Analyses based on Judd–Ofelt theory and optical absorption data indicate that the synthesized phosphors exhibit significant emission cross-sections and effective line widths. Under 401 nm excitation, the Ca₃La₃(BO₃)₅:0.03Sm³⁺ phosphor exhibited high color purity (82–90%) and favorable Commission Internationale de l’Éclairage coordinates, highlighting its potential as an orange–red emitter. These findings highlight the potential of the phosphors for high-performance solid-state lighting and optoelectronic applications, providing a promising alternative to existing phosphors.

Luminescence Properties and Judd–Ofelt Analysis of Orange–Red-Emitting Ca3La3(BO3)5:Sm3+ Phosphor

摘要

Luminescence Properties and Judd–Ofelt Analysis of Orange–Red-Emitting Ca₃La₃(BO₃)₅:Sm³⁺ Phosphor