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Enhancing blue luminescence from Ce-doped ZnO nanophosphor by Li doping

Undoped ZnO, Ce-doped ZnO, and (Li, Ce)-codoped ZnO nanophosphors were prepared by a sol-gel process. The effects of the additional doping with Li ions on the crystal structure, particle morphology, and luminescence properties of Ce-doped ZnO were investigated by X-ray diffraction, scanning electron...

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Autores principales: Shi, Qiang, Wang, Changzheng, Li, Shuhong, Wang, Qingru, Zhang, Bingyuan, Wang, Wenjun, Zhang, Junying, Zhu, Hailing
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4164330/
https://www.ncbi.nlm.nih.gov/pubmed/25258604
http://dx.doi.org/10.1186/1556-276X-9-480
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author Shi, Qiang
Wang, Changzheng
Li, Shuhong
Wang, Qingru
Zhang, Bingyuan
Wang, Wenjun
Zhang, Junying
Zhu, Hailing
author_facet Shi, Qiang
Wang, Changzheng
Li, Shuhong
Wang, Qingru
Zhang, Bingyuan
Wang, Wenjun
Zhang, Junying
Zhu, Hailing
author_sort Shi, Qiang
collection PubMed
description Undoped ZnO, Ce-doped ZnO, and (Li, Ce)-codoped ZnO nanophosphors were prepared by a sol-gel process. The effects of the additional doping with Li ions on the crystal structure, particle morphology, and luminescence properties of Ce-doped ZnO were investigated by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy and photoluminescence spectroscopy. The results indicate that the obtained samples are single phase, and a nanorod shaped morphology is observed for (Li, Ce)-codoping. Under excitation with 325 nm light, Ce-doped ZnO phosphors show an ultraviolet emission, a green emission, and a blue emission caused by Zn interstitials. The spectrum of the sample codoped with a proper Li concentration features two additional emissions that can be attributed to the Ce(3+) ions. With the increase of the Li doping concentration, the Ce(3+) blue luminescence of (Li, Ce)-codoped ZnO is obviously enhanced, which results not only from the increase of the Ce(3+) ion concentration itself but also from the energy transfer from the ZnO host material to the Ce(3+) ions. This enhancement reaches a maximum at a Li content of 0.02, and then decreases sharply due to the concentration quench. These nanophosphors may promise for application to the visible-light-emitting devices. PACS: 78.55.Et; 81.07.Wx; 81.20.Fw
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spelling pubmed-41643302014-09-25 Enhancing blue luminescence from Ce-doped ZnO nanophosphor by Li doping Shi, Qiang Wang, Changzheng Li, Shuhong Wang, Qingru Zhang, Bingyuan Wang, Wenjun Zhang, Junying Zhu, Hailing Nanoscale Res Lett Nano Express Undoped ZnO, Ce-doped ZnO, and (Li, Ce)-codoped ZnO nanophosphors were prepared by a sol-gel process. The effects of the additional doping with Li ions on the crystal structure, particle morphology, and luminescence properties of Ce-doped ZnO were investigated by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy and photoluminescence spectroscopy. The results indicate that the obtained samples are single phase, and a nanorod shaped morphology is observed for (Li, Ce)-codoping. Under excitation with 325 nm light, Ce-doped ZnO phosphors show an ultraviolet emission, a green emission, and a blue emission caused by Zn interstitials. The spectrum of the sample codoped with a proper Li concentration features two additional emissions that can be attributed to the Ce(3+) ions. With the increase of the Li doping concentration, the Ce(3+) blue luminescence of (Li, Ce)-codoped ZnO is obviously enhanced, which results not only from the increase of the Ce(3+) ion concentration itself but also from the energy transfer from the ZnO host material to the Ce(3+) ions. This enhancement reaches a maximum at a Li content of 0.02, and then decreases sharply due to the concentration quench. These nanophosphors may promise for application to the visible-light-emitting devices. PACS: 78.55.Et; 81.07.Wx; 81.20.Fw Springer 2014-09-10 /pmc/articles/PMC4164330/ /pubmed/25258604 http://dx.doi.org/10.1186/1556-276X-9-480 Text en Copyright © 2014 Shi et al.; licensee Springer. http://creativecommons.org/licenses/by/4.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.
spellingShingle Nano Express
Shi, Qiang
Wang, Changzheng
Li, Shuhong
Wang, Qingru
Zhang, Bingyuan
Wang, Wenjun
Zhang, Junying
Zhu, Hailing
Enhancing blue luminescence from Ce-doped ZnO nanophosphor by Li doping
title Enhancing blue luminescence from Ce-doped ZnO nanophosphor by Li doping
title_full Enhancing blue luminescence from Ce-doped ZnO nanophosphor by Li doping
title_fullStr Enhancing blue luminescence from Ce-doped ZnO nanophosphor by Li doping
title_full_unstemmed Enhancing blue luminescence from Ce-doped ZnO nanophosphor by Li doping
title_short Enhancing blue luminescence from Ce-doped ZnO nanophosphor by Li doping
title_sort enhancing blue luminescence from ce-doped zno nanophosphor by li doping
topic Nano Express
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4164330/
https://www.ncbi.nlm.nih.gov/pubmed/25258604
http://dx.doi.org/10.1186/1556-276X-9-480
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