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Structural and Optical Properties of Samarium Doped Calcium Fluoride Nanoparticles Synthesized By Co-Precipitation Technique / Duong, Ngoc Thanh

Tác giả : Duong, Ngoc Thanh

Nhà xuất bản : H. : ĐHQGHN

Năm xuất bản : 2016

Tùng thư : Vol. 32;No. 1 (2016)

Chủ đề : 1. CaF2 nanoparticles. 2. co-precipitation technique. 3. samarium. 4. Article.

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Tóm tắt :

CaF2nanoparticles doped with 0, 1, 2, 3, 4 and 5 mol% Sm3+ were prepared by co-precipitation method. These nanoparticles were studied by X-ray diffraction (XRD), transmission electron microscopy (TEM), photoluminescence (PL), photoluminescence excitation (PLE) spectra, energy-dispersive X-ray spectroscopy (EDS) and diffuse reflective spectra. The XRD patterns indicate cubic structure of CaF2 and no other impurities. TEM images show that CaF2 nanoparticles have size varying from 15 to 20 nm. The photoluminescence spectra show 4 peaks at 566 nm, 604 nm, 645 nm and 704 nm, which are assigned to different transitions from the 4G(4)5/2 excited state to the 6HJ with J = 5/2; 7/2; 9/2 and 11/2 ground states of Sm3+ ions. The PLE spectra show 8 lines, which are attributed to the absorption transitions from the 6H5/2 ground state to the 4H(1)9/2, 4D(2)3/2, 6P7/2, 4F(3)7/2, 6P5/2, 4M17/2, 4I(3)13/2 and 4M15/2 excited states. Six lines among eight excitation lines were observed in the diffuse reflection spectra.

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https://repository.vnu.edu.vn/handle/VNU_123/55551