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To luminesce or to change valence? Insight into the wavelength dependency of the reversible valence switching of europium in Sr3SiO5

Jieqi Hu (UGent) , Zetian Yang (UGent) , Ang Feng (UGent) , Rik Van Deun (UGent) , Philippe Smet (UGent) and David Van der Heggen (UGent)
(2022) JOURNAL OF PHYSICAL CHEMISTRY C. 126(50). p.21396-21404
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Abstract
A good control over the valence state of dopants in luminescent materials or phosphors is important for the develop-ment of highly efficient phosphors for white light-emitting diodes (LEDs). Detailed spectroscopic studies allow us to reveal optically induced charge transfer processes and elucidate the underlying mechanisms in phosphors with additional functionalities such as photochromism or persistent luminescence. However, the spectro-scopic study of the valence switching of europium has scarcely been reported. Here, we report on the Sr3SiO5:Eu phosphor, in which photo-reduction (Eu3+-* Eu2+) and photo-or thermal-oxidation (Eu2+-* Eu3+) reactions are demonstrated. The variation of the illumination wavelength influences the efficiency of both the photo-reduction/oxidation and the accompanying dynamic process, especially when the two opposite reactions occur simultaneously. Temperature-dependent annealing indicates a large trap depth for the electron trapped by Eu3+. The good stability of Eu2+ obtained by photo-reduction and the repeatability of the Eu2+/Eu3+ valence switching are confirmed as well. Furthermore, the application of optical information storage is demonstrated based on this phosphor. The results of this work may not only improve the understanding of Eu2+/Eu3+ valence change during illumination but also allow the development of new functional luminescent materials.
Keywords
CHARGE-TRANSFER, EU3+, REDUCTION, EU2+, CRYSTAL, STATE, IONS, UV, AFTERGLOW, EMISSION

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Citation

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MLA
Hu, Jieqi, et al. “To Luminesce or to Change Valence? Insight into the Wavelength Dependency of the Reversible Valence Switching of Europium in Sr3SiO5.” JOURNAL OF PHYSICAL CHEMISTRY C, vol. 126, no. 50, 2022, pp. 21396–404, doi:10.1021/acs.jpcc.2c06486.
APA
Hu, J., Yang, Z., Feng, A., Van Deun, R., Smet, P., & Van der Heggen, D. (2022). To luminesce or to change valence? Insight into the wavelength dependency of the reversible valence switching of europium in Sr3SiO5. JOURNAL OF PHYSICAL CHEMISTRY C, 126(50), 21396–21404. https://doi.org/10.1021/acs.jpcc.2c06486
Chicago author-date
Hu, Jieqi, Zetian Yang, Ang Feng, Rik Van Deun, Philippe Smet, and David Van der Heggen. 2022. “To Luminesce or to Change Valence? Insight into the Wavelength Dependency of the Reversible Valence Switching of Europium in Sr3SiO5.” JOURNAL OF PHYSICAL CHEMISTRY C 126 (50): 21396–404. https://doi.org/10.1021/acs.jpcc.2c06486.
Chicago author-date (all authors)
Hu, Jieqi, Zetian Yang, Ang Feng, Rik Van Deun, Philippe Smet, and David Van der Heggen. 2022. “To Luminesce or to Change Valence? Insight into the Wavelength Dependency of the Reversible Valence Switching of Europium in Sr3SiO5.” JOURNAL OF PHYSICAL CHEMISTRY C 126 (50): 21396–21404. doi:10.1021/acs.jpcc.2c06486.
Vancouver
1.
Hu J, Yang Z, Feng A, Van Deun R, Smet P, Van der Heggen D. To luminesce or to change valence? Insight into the wavelength dependency of the reversible valence switching of europium in Sr3SiO5. JOURNAL OF PHYSICAL CHEMISTRY C. 2022;126(50):21396–404.
IEEE
[1]
J. Hu, Z. Yang, A. Feng, R. Van Deun, P. Smet, and D. Van der Heggen, “To luminesce or to change valence? Insight into the wavelength dependency of the reversible valence switching of europium in Sr3SiO5,” JOURNAL OF PHYSICAL CHEMISTRY C, vol. 126, no. 50, pp. 21396–21404, 2022.
@article{01GQ764P7KKMFCHFQTGHV893PE,
  abstract     = {{A good control over the valence state of dopants in luminescent materials or phosphors is important for the develop-ment of highly efficient phosphors for white light-emitting diodes (LEDs). Detailed spectroscopic studies allow us to reveal optically induced charge transfer processes and elucidate the underlying mechanisms in phosphors with additional functionalities such as photochromism or persistent luminescence. However, the spectro-scopic study of the valence switching of europium has scarcely been reported. Here, we report on the Sr3SiO5:Eu phosphor, in which photo-reduction (Eu3+-* Eu2+) and photo-or thermal-oxidation (Eu2+-* Eu3+) reactions are demonstrated. The variation of the illumination wavelength influences the efficiency of both the photo-reduction/oxidation and the accompanying dynamic process, especially when the two opposite reactions occur simultaneously. Temperature-dependent annealing indicates a large trap depth for the electron trapped by Eu3+. The good stability of Eu2+ obtained by photo-reduction and the repeatability of the Eu2+/Eu3+ valence switching are confirmed as well. Furthermore, the application of optical information storage is demonstrated based on this phosphor. The results of this work may not only improve the understanding of Eu2+/Eu3+ valence change during illumination but also allow the development of new functional luminescent materials.}},
  author       = {{Hu, Jieqi and Yang, Zetian and Feng, Ang and Van Deun, Rik and Smet, Philippe and Van der Heggen, David}},
  issn         = {{1932-7447}},
  journal      = {{JOURNAL OF PHYSICAL CHEMISTRY C}},
  keywords     = {{CHARGE-TRANSFER,EU3+,REDUCTION,EU2+,CRYSTAL,STATE,IONS,UV,AFTERGLOW,EMISSION}},
  language     = {{eng}},
  number       = {{50}},
  pages        = {{21396--21404}},
  title        = {{To luminesce or to change valence? Insight into the wavelength dependency of the reversible valence switching of europium in Sr3SiO5}},
  url          = {{http://doi.org/10.1021/acs.jpcc.2c06486}},
  volume       = {{126}},
  year         = {{2022}},
}

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