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- Title
Multistep synthesis and upconversion luminescence of spherical Gd2O3:Er and Gd2O3:Er @ silica.
- Authors
Hai, Nguyen Thi Quy; Anh, Tran Kim; Chau, Pham Thi Minh; Ha, Vu Thi Thai; Van Tuyen, Ho; Huong, Tran Thu; Phuong, Ha Thi; Le Minh, Quoc
- Abstract
Spherical Gd2O3:Er3+ and Gd2O3:Er3+ @ silica nanoparticles have been successfully synthesized by a multistep procedure including precipitation and sol–gel processes from rare-earth nitrates, TEOS and urea as starting precursors. The structure, morphology and chemical composition of the products were characterized by X-ray diffraction, field emission scanning electron microscopy, and fourier transform infrared spectroscopy. The results indicated that the obtained phosphors consist of separated, non-agglomerated spheres in nanoscale with an uniform, ideal spherical shape. The suitable amount of TEOS was addressed to obtain the spherical Gd2O3:Er3+ @ silica nanocomposites with the luminescence intensity almost unchanged with respect to the uncoated Gd2O3:Er3+ sample. Besides, the upconversion emission spectra showed intense green and red emission bands under 980-nm laser diode excitation with remarkable increase in the red emissions. The upconversion luminescence followed the two-photon mechanism for green and red emissions. With obtained results, the prepared nanospheres are expected to be a potential material to create functional groups for subsequent bio-conjugation with various biomolecules in medical diagnostics.
- Subjects
ERBIUM compounds; PHOTON upconversion; LUMINESCENCE; FOURIER transform infrared spectroscopy; FIELD emission electron microscopy; SILICA nanoparticles
- Publication
Journal of Materials Science: Materials in Electronics, 2020, Vol 31, Issue 4, p3354
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-020-02883-0