Influences of growth durations on characteristics of NaYF4:(Yb,Tm) upconversion materials

Nguyen, Thi Dung and Hoang, Van Thanh and Nguyen, Dinh Lam (2019) Influences of growth durations on characteristics of NaYF4:(Yb,Tm) upconversion materials. Influences of growth durations on characteristics of NaYF4:(Yb,Tm) upconversion materials, 35 (4). ISSN 0866-8612

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Abstract

NaYF4:(Yb,Tm) upconversion materials were synthesized by the simple hydrothermal method. Growth duration was varied from 4h to 12h under a growth temperature of 150oC. The structural, optical and surface morphology characteristics of the NaYF4:(Yb,Tm) UC materials were investigated. The XRD and SEM results illustrated that the NaYF4:(Yb,Tm) materials were transformed from the multiple phases (hexagonal and cubic) to the single-phase (hexagonal prism) as growth duration being longer than 8h with the average diameter and length of these prisms being about 0.5 µm and 2 µm, respectively. Under 980 nm laser excitation, the NaYF4:(Yb,Tm) emits at peaks of 450 nm (1D2→ 3F4), 475 nm (1G4→3H6), 647 nm (1G4→3F4) and 697 nm (3F3→3H6), with the highest emission belonging to NaYF4:(Yb,Tm) grown for 8h.

Item Type:	Article
Subjects:	Engineering Physics
Divisions:	Faculty of Engineering Physics and Nanotechnology (FEPN)
Depositing User:	Ms. Thi Dung Nguyen
Date Deposited:	20 Dec 2019 04:40
Last Modified:	20 Dec 2019 04:46
URI:	http://eprints.uet.vnu.edu.vn/eprints/id/eprint/3809

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• Influences of growth durations on characteristics of NaYF4:(Yb,Tm) upconversion materials. (deposited 20 Dec 2019 04:40) [Currently Displayed]

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