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Sol–Gel Synthesis of CaTiO(3):Pr(3+) Red Phosphors: Tailoring the Synthetic Parameters for Luminescent and Afterglow Applications
[Image: see text] Two sol–gel synthetic routes for the preparation of CaTiO(3):Pr(3+) red emitting phosphors were compared, with the aim of producing nanostructured materials with tailored luminescence/afterglow properties. The effect of the synthetic parameters, such as the addition of a stabilizer...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2017
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6044957/ https://www.ncbi.nlm.nih.gov/pubmed/30023733 http://dx.doi.org/10.1021/acsomega.7b00761 |
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author | Meroni, Daniela Porati, Luca Demartin, Francesco Poelman, Dirk |
author_facet | Meroni, Daniela Porati, Luca Demartin, Francesco Poelman, Dirk |
author_sort | Meroni, Daniela |
collection | PubMed |
description | [Image: see text] Two sol–gel synthetic routes for the preparation of CaTiO(3):Pr(3+) red emitting phosphors were compared, with the aim of producing nanostructured materials with tailored luminescence/afterglow properties. The effect of the synthetic parameters, such as the addition of a stabilizer and calcination temperature, on the structural, morphological, and optical properties was investigated. The desired perovskite phase was obtained at a calcination temperature of 800 °C or higher. Although the use of acetic acid as the chelating agent leads to micrometric particles with heterogeneous composition, the presence of hydroxypropylcellulose (HPC) results in smaller, less aggregated particles as well as in a high phase purity. At the highest HPC content, surface Ca-rich impurities were detected, although no segregated Ca-rich phases were detectable by X-ray powder diffraction analyses. Luminescence properties were found to be positively related to the phase purity of the oxide, with the highest quantum yields at temperatures equal to or higher than 1000 °C. On the contrary, persistent luminescence properties were highest at intermediate calcination temperatures and for samples synthesized with acetic acid. Overall, a notable role of oxygen vacancies resulting from local Ca excess was observed, acting as trap levels promoting longer relaxation pathways. Thanks to the small-sized particles and best steady-state luminescent properties due to a substantial decrease of lattice defects, the HPC synthesis is a promising strategy for light-emitting diode applications. On the other hand, the acetic acid synthesis promoted a higher defect density, which is required for an efficient yield of light emission in the long time range and is thus more suitable for afterglow applications. |
format | Online Article Text |
id | pubmed-6044957 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-60449572018-07-16 Sol–Gel Synthesis of CaTiO(3):Pr(3+) Red Phosphors: Tailoring the Synthetic Parameters for Luminescent and Afterglow Applications Meroni, Daniela Porati, Luca Demartin, Francesco Poelman, Dirk ACS Omega [Image: see text] Two sol–gel synthetic routes for the preparation of CaTiO(3):Pr(3+) red emitting phosphors were compared, with the aim of producing nanostructured materials with tailored luminescence/afterglow properties. The effect of the synthetic parameters, such as the addition of a stabilizer and calcination temperature, on the structural, morphological, and optical properties was investigated. The desired perovskite phase was obtained at a calcination temperature of 800 °C or higher. Although the use of acetic acid as the chelating agent leads to micrometric particles with heterogeneous composition, the presence of hydroxypropylcellulose (HPC) results in smaller, less aggregated particles as well as in a high phase purity. At the highest HPC content, surface Ca-rich impurities were detected, although no segregated Ca-rich phases were detectable by X-ray powder diffraction analyses. Luminescence properties were found to be positively related to the phase purity of the oxide, with the highest quantum yields at temperatures equal to or higher than 1000 °C. On the contrary, persistent luminescence properties were highest at intermediate calcination temperatures and for samples synthesized with acetic acid. Overall, a notable role of oxygen vacancies resulting from local Ca excess was observed, acting as trap levels promoting longer relaxation pathways. Thanks to the small-sized particles and best steady-state luminescent properties due to a substantial decrease of lattice defects, the HPC synthesis is a promising strategy for light-emitting diode applications. On the other hand, the acetic acid synthesis promoted a higher defect density, which is required for an efficient yield of light emission in the long time range and is thus more suitable for afterglow applications. American Chemical Society 2017-08-28 /pmc/articles/PMC6044957/ /pubmed/30023733 http://dx.doi.org/10.1021/acsomega.7b00761 Text en Copyright © 2017 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes. |
spellingShingle | Meroni, Daniela Porati, Luca Demartin, Francesco Poelman, Dirk Sol–Gel Synthesis of CaTiO(3):Pr(3+) Red Phosphors: Tailoring the Synthetic Parameters for Luminescent and Afterglow Applications |
title | Sol–Gel Synthesis of CaTiO(3):Pr(3+) Red Phosphors: Tailoring
the Synthetic Parameters for Luminescent and Afterglow Applications |
title_full | Sol–Gel Synthesis of CaTiO(3):Pr(3+) Red Phosphors: Tailoring
the Synthetic Parameters for Luminescent and Afterglow Applications |
title_fullStr | Sol–Gel Synthesis of CaTiO(3):Pr(3+) Red Phosphors: Tailoring
the Synthetic Parameters for Luminescent and Afterglow Applications |
title_full_unstemmed | Sol–Gel Synthesis of CaTiO(3):Pr(3+) Red Phosphors: Tailoring
the Synthetic Parameters for Luminescent and Afterglow Applications |
title_short | Sol–Gel Synthesis of CaTiO(3):Pr(3+) Red Phosphors: Tailoring
the Synthetic Parameters for Luminescent and Afterglow Applications |
title_sort | sol–gel synthesis of catio(3):pr(3+) red phosphors: tailoring
the synthetic parameters for luminescent and afterglow applications |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6044957/ https://www.ncbi.nlm.nih.gov/pubmed/30023733 http://dx.doi.org/10.1021/acsomega.7b00761 |
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