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The gadolinium effect on crystallization behavior and luminescence of β‐NaYF 4 :Yb,Er phase
Abstract Single phase β‐NaY 0.8‐ x Gd x Yb 0.18 Er 0.02 F 4 nanoparticles with different concentrations of gadolinium ions were prepared via PVP‐assisted solvothermal treating at 200°C (PVP‐ polyvinylpyrrolidone). With the increase in Gd 3+ concentration, size of the nanoparticles decreased. The up‐...
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Published in: | International journal of applied ceramic technology 2020-05, Vol.17 (3), p.1445-1452 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Abstract
Single phase β‐NaY
0.8‐
x
Gd
x
Yb
0.18
Er
0.02
F
4
nanoparticles with different concentrations of gadolinium ions were prepared via PVP‐assisted solvothermal treating at 200°C (PVP‐ polyvinylpyrrolidone). With the increase in Gd
3+
concentration, size of the nanoparticles decreased. The up‐converting spectra recorded upon 980 nm irradiation showed the green (510‐560 nm) and red (640‐690 nm) emissions, due to
2
H
11/2
,
4
S
3/2
→
4
I
15/2
and
4
F
9/2
→
4
I
15/2
transitions, respectively. The strongest up‐conversion luminescence was detected in 15 mol% Gd
3+
‐doped nanoparticles obtained after 20 hours of solvothermal treating. With the rise of Gd
3+
content up‐conversion emission decreased due to increased defect concentration in the NaYF
4
matrix. Fourier transform infrared spectroscopy proved in situ generation of hydrophilic nanoparticles as a result of PVP ligands retention at the particle surface. |
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ISSN: | 1546-542X 1744-7402 |
DOI: | 10.1111/ijac.13363 |