Impacts of 5d electron binding energy and electron-phonon coupling on luminescence of Ce 3+ in Li

Title

Impacts of 5d electron binding energy and electron-phonon coupling on luminescence of Ce 3+ in Li 6 Y(BO 3 ) 3

 Author

Ou, Yiyi (Sun Yat-sen University)
Zhou, Weijie (Sun Yat-sen University)
Hou, Dejian (Hanshan Normal University, Chaozhou)
Brik, Mikhail G. (Chongqing University of Posts and Telecommunications; University of Tartu; Jan Długosz University)
Dorenbos, P. (TU Delft RST/Luminescence Materials) ORCID 0000-0002-1004-8353
Huang, Yan (Institute of High Energy Physics Chinese Academy of Science)
Liang, Hongbin (Sun Yat-sen University)

Date

2019

 Abstract

In this work, the crystal structure and electronic structure as well as the synchrotron radiation vacuum ultraviolet-ultraviolet-visible (VUV-UV-vis) luminescence properties of Li 6 Y(BO 3 ) 3 (LYBO):Ce 3+ phosphors were investigated in detail. The Rietveld refinement and DFT calculation reveal the P2 1 /c monoclinic crystal phase and the direct band gap of the LYBO compound, respectively. Only one kind of Ce 3+ 4f-5d transition is resolved in terms of the low temperature VUV-UV excitation, UV-vis emission spectra and luminescence decay curves. Furthermore, by constructing the vacuum referred binding energy (VRBE) scheme and applying the frequency-degenerate vibrational model, the impacts of 5d electron binding energy and electron-phonon coupling on luminescence of Ce 3+ in LYBO are analysed. The results show that the Ce 3+ emission in LYBO possesses a moderate intrinsic thermal stability. With the increase in concentration, the thermal stability of the emission gets worse due to the possible thermally-activated concentration quenching. In addition, the simulation of Ce 3+ emission profile at low temperature reveals that the 4f-5d electronic transitions of Ce 3+ ions can be treated to couple with one frequency-degenerate vibrational mode having the effective phonon energy of ∼257 cm −1 with the corresponding Huang-Rhys parameter of ∼6, which indicates a strong electron-phonon interaction of Ce 3+ luminescence in the Li 6 Y(BO 3 ) 3 host. Finally, the X-ray excited luminescence spectrum of the LYBO:5%Ce 3+ phosphor is measured to check the potential scintillator applications.


To reference this document use:

http://resolver.tudelft.nl/uuid:97bf6b5c-caf9-4864-9053-15c4e2a694e8

 DOI

https://doi.org/10.1039/c9ra00381a

 ISSN

2046-2069

 Source

RSC Advances, 9 (14), 7908-7915

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

© 2019 Yiyi Ou, Weijie Zhou, Dejian Hou, Mikhail G. Brik, P. Dorenbos, Yan Huang, Hongbin Liang
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