Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 810, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.151761
Keywords
Hollow nanocubes; Upconversion luminescence; Single-band red emission; Multiple excitation wavelengths; Energy transfer
Categories
Funding
- NSFC-Henan Province Joint Fund [U1604144]
- NSFC [11804079]
- Science Fund of Henan Province [162300410020]
- Science Research Project of Education Department of Henan Province [17A140005, 17B140001]
- Science and Technology Development Project of Henan Province [162102210170]
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Upconversion nanoparticles (UCNPs) doped with lanthanide ions have potential applications in biomedical, solar cells and displays. However, the intensity of the upconversion luminescence (UCL) is limited by the surface effects of nanomaterials, lattice defects, etc. Here, a novel alpha-NaErF4 hollow nanocube is fabricated by using divalent manganese ions (Mn2+) to substitute trivalent erbium ions (Er3+) in the NaErF4 matrix. The hollow-shell structure can weaken the luminescence quenching and surface quenching effects, reduce the energy loss of higher energy levels in nanoparticles, and improve the light capture ability of nanoparticles. So the UCL of alpha-NaErF4 hollow nanocubes is greatly improved, which is 14, 790 and 1071 times higher than that of the beta-NaErF4 under 808, 980 and 1530 nm laser excitation, respectively, and the emission in the red region is enhanced respectively by 69, 2049 and 2902 times. In particular, the hollow nanocubes emit intense single-band red emission under the three different wavelengths, respectively. Moreover, the magnetization of alpha-NaErF4 hollow nanocubes is 2.16 emu g(-1) at room temperature, which is larger than that of gadolinium-based materials. Hollow-shell structure, excellent paramagnetism and single-band red upconversion emission excited by various wavelengths will create NaErF4:40Mn UCNPs a good application prospect in the biomedical field. (C) 2019 Elsevier B.V. All rights reserved.
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