Ghent University Academic Bibliography

Advanced

Concentration and temperature dependent upconversion luminescence of CaWO4:Er 3+, Yb3+ 3D microstructure materials

Jing Liu UGent, Anna Kaczmarek UGent and Rik Van Deun UGent (2017) JOURNAL OF LUMINESCENCE. 188. p.604-611
abstract
We have successfully synthesized upconversion CaWO4:Er3+,Yb3+ 3D microstructure materials by employing a hydrothermal method, while using different concentrations of the precursors (CaCl2, Na2WO4). By adjusting the concentration of the precursors the shape of the CaWO4:Er3+,Yb3+ particles changed from dumbbell-like to spherical, the size first decreased and then increased with the precursor concentration change. The morphology of the obtained samples was uniform except for the 10 mmol CaWO4:Er3+,Yb3+ sample, where the particles were aggregated. XRD measurements were carried out to confirm that the structure of the CaWO4 products prepared at different precursor concentrations remained unchanged. The products synthesized at different concentrations had different exothermic peaks, therefore different heat-treatment temperatures were used. Regarding the upconversion luminescence properties, the intensities of the different samples without heat treatment were almost identical, only the relative intensity of the green emission and the red emission changed. In addition, by adjusting the heat-treatment temperature from 300 degrees C to 1000 degrees C, for the 5 mmol CaWO4:Er3+,Yb3+ sample the relative intensity of the green and the red emission slowly increased and then decreased. As a result of this altered ratio of the two emission peaks the corresponding CIE coordinates also changed. For comparison, the 10 mmol CaWO4:Er3+,Yb3+ sample heat treated from 400 degrees C to 1100 degrees C exhibited similar luminescence behaviour, except that the difference in intensity between the S-4(3/2) -> I-4(15/2) and F-4(9/2) I-4(15/2) peaks was larger with temperature change than observed for the 5 mmol CaWO4:Er3+,Yb3+ sample. The H-2(11/2) -> I-4(15/2), S-4(3/2) -> I-4(15/2) and F-4(9/2) -> I-4(15/2) transitions all can be explained by a two-photon absorption process.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
3D microstructure, Concentrations of precursors, Relative intensity, Ratio of the two emission peaks, RAY COMPUTED-TOMOGRAPHY, PHOTOLUMINESCENCE PROPERTIES, HYDROTHERMAL SYNTHESIS, MAGNETIC-RESONANCE, NANOPARTICLES, ARCHITECTURES, PHOSPHORS, NANOCRYSTALS, FLUORESCENCE, NANOPROBES
journal title
JOURNAL OF LUMINESCENCE
J. Lumines.
volume
188
pages
604 - 611
publisher
Elsevier BV
Web of Science type
Article
Web of Science id
000404308400089
ISSN
0022-2313
DOI
10.1016/j.jlumin.2017.05.022
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
8523380
handle
http://hdl.handle.net/1854/LU-8523380
date created
2017-06-12 19:50:14
date last changed
2017-10-24 09:57:36
@article{8523380,
  abstract     = {We have successfully synthesized upconversion CaWO4:Er3+,Yb3+ 3D microstructure materials by employing a hydrothermal method, while using different concentrations of the precursors (CaCl2, Na2WO4). By adjusting the concentration of the precursors the shape of the CaWO4:Er3+,Yb3+ particles changed from dumbbell-like to spherical, the size first decreased and then increased with the precursor concentration change. The morphology of the obtained samples was uniform except for the 10 mmol CaWO4:Er3+,Yb3+ sample, where the particles were aggregated. XRD measurements were carried out to confirm that the structure of the CaWO4 products prepared at different precursor concentrations remained unchanged. The products synthesized at different concentrations had different exothermic peaks, therefore different heat-treatment temperatures were used. Regarding the upconversion luminescence properties, the intensities of the different samples without heat treatment were almost identical, only the relative intensity of the green emission and the red emission changed. In addition, by adjusting the heat-treatment temperature from 300 degrees C to 1000 degrees C, for the 5 mmol CaWO4:Er3+,Yb3+ sample the relative intensity of the green and the red emission slowly increased and then decreased. As a result of this altered ratio of the two emission peaks the corresponding CIE coordinates also changed. For comparison, the 10 mmol CaWO4:Er3+,Yb3+ sample heat treated from 400 degrees C to 1100 degrees C exhibited similar luminescence behaviour, except that the difference in intensity between the S-4(3/2) -{\textrangle} I-4(15/2) and F-4(9/2) I-4(15/2) peaks was larger with temperature change than observed for the 5 mmol CaWO4:Er3+,Yb3+ sample. The H-2(11/2) -{\textrangle} I-4(15/2), S-4(3/2) -{\textrangle} I-4(15/2) and F-4(9/2) -{\textrangle} I-4(15/2) transitions all can be explained by a two-photon absorption process.},
  author       = {Liu, Jing and Kaczmarek, Anna and Van Deun, Rik},
  issn         = {0022-2313},
  journal      = {JOURNAL OF LUMINESCENCE},
  keyword      = {3D microstructure,Concentrations of precursors,Relative intensity,Ratio of the two emission peaks,RAY COMPUTED-TOMOGRAPHY,PHOTOLUMINESCENCE PROPERTIES,HYDROTHERMAL SYNTHESIS,MAGNETIC-RESONANCE,NANOPARTICLES,ARCHITECTURES,PHOSPHORS,NANOCRYSTALS,FLUORESCENCE,NANOPROBES},
  language     = {eng},
  pages        = {604--611},
  publisher    = {Elsevier BV},
  title        = {Concentration and temperature dependent upconversion luminescence of CaWO4:Er 3+, Yb3+ 3D microstructure materials},
  url          = {http://dx.doi.org/10.1016/j.jlumin.2017.05.022},
  volume       = {188},
  year         = {2017},
}

Chicago
Liu, Jing, Anna Kaczmarek, and Rik Van Deun. 2017. “Concentration and Temperature Dependent Upconversion Luminescence of CaWO4:Er 3+, Yb3+ 3D Microstructure Materials.” Journal of Luminescence 188: 604–611.
APA
Liu, Jing, Kaczmarek, A., & Van Deun, R. (2017). Concentration and temperature dependent upconversion luminescence of CaWO4:Er 3+, Yb3+ 3D microstructure materials. JOURNAL OF LUMINESCENCE, 188, 604–611.
Vancouver
1.
Liu J, Kaczmarek A, Van Deun R. Concentration and temperature dependent upconversion luminescence of CaWO4:Er 3+, Yb3+ 3D microstructure materials. JOURNAL OF LUMINESCENCE. Elsevier BV; 2017;188:604–11.
MLA
Liu, Jing, Anna Kaczmarek, and Rik Van Deun. “Concentration and Temperature Dependent Upconversion Luminescence of CaWO4:Er 3+, Yb3+ 3D Microstructure Materials.” JOURNAL OF LUMINESCENCE 188 (2017): 604–611. Print.