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http://hdl.handle.net/10119/19326
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| Title: | Hole detrapping type persistent phosphors of RE2O2S (RE= La, Gd, Y, Lu) doped with Eu3+-Pr3+ and Eu3+-Tb3+ |
| Authors: | Hashimoto, Atsunori
Ueda, Jumpei
Aoki, Yasushi
Dorenbos, Pieter
Tanabe, Setsuhisa |
| Keywords: | persistent phosphors
lanthanide ions
Hole trap
Eu3+ |
| Issue Date: | 2023-07-26 |
| Publisher: | American Chemical Society |
| Magazine name: | The Journal of Physical Chemistry C |
| Volume: | 127 |
| Number: | 31 |
| Start page: | 15611 |
| End page: | 15619 |
| DOI: | 10.1021/acs.jpcc.3c03251 |
| Abstract: | RE2O2S:Eu3+-Ln3+ (RE=La, Gd, Y, Lu; Ln=Pr, Tb) samples were prepared by a solid-state reaction method to develop new red persistent phosphors and to demonstrate the hole de-trapping mechanism. All Eu3+-singly doped RE2O2S show very weak thermoluminescence (TL) glow peaks, while by co-doping Pr3+ or Tb3+ ions additional strong TL peaks were observed. In the TL spectra and persistent luminescence (PersL) spectra, only Eu3+ luminescence lines were observed, but there is no Pr3+ and Tb3+ luminescence. From the PersL excitation spectra, it is found that the PersL is caused after the excitation to the charge transfer state of Eu2+-S- in which the hole is in the valence band. These results show that the Eu3+ acts as a recombination center and the Pr3+ and Tb3+ ion act as a hole trap center. The deeper hole trap depth of Pr3+ compared with Tb3+ and the RE dependence of hole trap depth are explained using a vacuum referred binding energy diagram considering the nephelauxetic effect. The La2O2S:Eu3+-Pr3+ was the best composition among the samples as a persistent phosphor at the ambient temperature, showing the strong red persistent luminescence in a short time range (>100 mcd/m2 for a few seconds). |
| Rights: | Atsunori Hashimoto, Jumpei Ueda, Yasushi Aoki, Pieter Dorenbos, Setsuhisa Tanabe, The Journal of Physical Chemistry C, 2023, 127, 31, 15611–15619. This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright (c) American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jpcc.3c03251. |
| URI: | http://hdl.handle.net/10119/19326 |
| Material Type: | author |
| Appears in Collections: | c10-1. 雑誌掲載論文 (Journal Articles)
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