Synthesis and Photoluminescence Properties of Sm³⁺-Doped Ca₁₀(PO₄)₆(OH)₂ Nanowire

Abstract:

The Sm³⁺-doped Ca₁₀(PO₄)₆(OH)₂ nanowires are synthesized by hydrothermal method. X-ray diffraction confirmed that the nanowires are made of the hexagonal Ca₁₀(PO₄)₆(OH)₂. Scanning electron microscope and transmission electron microscope analysis show that the lengths of the nanowires are approximately 5μm, and their diameters are around 100 nm, and the aspect (length/diameter) ratio is about 50. The room temperature photoluminescence (PL) spectra of Sm³⁺-doped Ca₁₀(PO₄)₆(OH)₂ nanowires doped with different Sm³⁺ concentration under 405 nm excitation has been investigated. It is found that there are three main sharp emissions peaks at near 569, 604, and 649 nm. The three emissions are due to the f-f forbidden transitions of the 4f electrons of Sm³⁺, corresponding to ⁴G_5/2→⁶H_5/2 (569 nm), ⁶H_7/2(604 nm), and ⁶H_9/2(649 nm), respectively. In addition, concentration quenching is also observed. It is found that the Sm^{3+ 4}G_5/2→⁶H_7/2(604 nm) emission intensity of Sm³⁺-doped Ca₁₀(PO₄)₆(OH)₂ nanowires significantly increases with the increase of Sm³⁺ concentration, and shows a maximum when Sm³⁺ doping content is 0.5%. If Sm³⁺ concentration continues to increase, namely more than 0.5%, the Sm^{3+ 4}G_5/2→⁶H_7/2 emission intensity decreases.

• Periodical: Advanced Materials Research (Volumes 391-392)
• Pages: 1123-1127
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.391-392.1123
• Online since: December 2011
• Authors: Qi Xiao, Lan Gao
• Keywords: Nanowire, Photoluminescence (PL), Sm³⁺-Doped Ca₁₀(PO₄)₆(OH)₂

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