Site Occupancies, VUV-UV-vis Photoluminescence, and X-ray Radioluminescence of Eu2+-Doped RbBaPO4

Title

Site Occupancies, VUV-UV-vis Photoluminescence, and X-ray Radioluminescence of Eu2+-Doped RbBaPO4

 Author

Zhou, Rongfu (Sun Yat-sen University)
Ma, Fengkai (Sun Yat-sen University)
Su, Fang (Sun Yat-sen University)
Ou, Yiyi (Sun Yat-sen University)
Qi, Zeming (University of Science and Technology of China)
Zhang, Jianhui (Sun Yat-sen University)
Huang, Yan (Institute of High Energy Physics Chinese Academy of Science)
Dorenbos, P. (TU Delft RST/Luminescence Materials) ORCID 0000-0002-1004-8353
Liang, Hongbin (Sun Yat-sen University)

Date

2020

 Abstract

RbBaPO4:Eu2+ phosphors have been prepared by a high-temperature solid-state reaction method, and the structure was determined by Rietveld refinement based on powder X-ray diffraction (P-XRD) data. Their VUV-UV-vis photoluminescence properties are systematically investigated with three objectives: (1) based on low-temperature spectra, we clarify the site occupancies of Eu2+, and demonstrate that the doublet emission bands at ∼406 and ∼431 nm originate from Eu2+ in Ba2+ [Eu2+(I)] and Rb+ [Eu2+(II)] sites, respectively; (2) an electron-vibrational interaction (EVI) analysis is conducted to estimate the Huang-Rhys factors, the zero-phonon lines (ZPLs) and the Stokes shifts of Eu2+ in Rb+ and Ba2+ sites; (3) the studies on luminescence decay of Eu2+(I) reveal that dipole-dipole interaction is mainly responsible for the energy transfer from Eu2+(I) to Eu2+(II), and the energy migration between Eu2+(I) is weak. Finally, the X-ray excited luminescence (XEL) spectrum indicates that the light yield of the sample RbBa0.995Eu0.005PO4 is ∼17700 ph/MeV, showing its potential application in X-ray detecting.


To reference this document use:

http://resolver.tudelft.nl/uuid:d75bbd1f-1072-41b9-986a-772806f83735

 DOI

https://doi.org/10.1021/acs.inorgchem.0c02714

 Embargo date

2021-11-12

 ISSN

0020-1669

 Source

Inorganic Chemistry, 59 (23), 17421-17429

 Bibliographical note

Accepted Author Manuscript

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

© 2020 Rongfu Zhou, Fengkai Ma, Fang Su, Yiyi Ou, Zeming Qi, Jianhui Zhang, Yan Huang, P. Dorenbos, Hongbin Liang
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