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Interconfigurational d-f luminescence of Pr3+ ions in praseodymium doped Li6Y(BO3)3 single crystals

Romet, I. ; Tichy-Rács ; Lengyel, K. ; Feldbach, E. ; Kovács, L. ; Corradi, G. ; Chernenko, K. LU ; Kirm, M. ; Spassky, D. and Nagirnyi, V. (2024) In Journal of Luminescence 265.
Abstract

Luminescence properties of undoped Li6Y(BO3)3 (LYB) crystals grown by the Bridgman method as well as undoped and praseodymium doped LYB crystals grown by the Czochralski method were studied under excitation by ultraviolet light, synchrotron radiation and electron beam in the temperature region of 5–300 K. The emission bands peaking at 4.8, 3.76 and 2.95 eV were found in undoped Czochralski-grown crystals, while the band at 3.34 eV was dominant in the Bridgman-grown crystals. These bands are presumably ascribed to excitons localized at regular and defect-perturbed lattice sites. Intense emission bands peaking at 4.75, 4.50, 4.17 and 3.98 eV were discovered in Pr doped crystals at low temperatures and... (More)

Luminescence properties of undoped Li6Y(BO3)3 (LYB) crystals grown by the Bridgman method as well as undoped and praseodymium doped LYB crystals grown by the Czochralski method were studied under excitation by ultraviolet light, synchrotron radiation and electron beam in the temperature region of 5–300 K. The emission bands peaking at 4.8, 3.76 and 2.95 eV were found in undoped Czochralski-grown crystals, while the band at 3.34 eV was dominant in the Bridgman-grown crystals. These bands are presumably ascribed to excitons localized at regular and defect-perturbed lattice sites. Intense emission bands peaking at 4.75, 4.50, 4.17 and 3.98 eV were discovered in Pr doped crystals at low temperatures and related to the interconfigurational 4f15d1 → 4f2 radiative transitions in Pr3+ ions. The structure of the emission spectrum is shown to be determined by the 3H4, 3H5, 3H6, 3F2, 3F3, 3F4 terms of the Pr3+ ion. The characteristic decay time of the 4f15d1 → 4f2 emission is τ = 24 ns at low temperatures, however, it shortens to 9 ns by room temperature due to a strong thermal quenching. The study of glow curves and spectra of thermostimulated luminescence in Li6Y(BO3)3:Pr crystal irradiated by 10-keV electron beam shows that Pr3+ ions do not participate in an electron-hole recombination process.

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author
; ; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Fast luminescence, Lithium yttrium borate crystals, Pr 5d-4f emission, Synchrotron radiation
in
Journal of Luminescence
volume
265
article number
120216
publisher
Elsevier
external identifiers
  • scopus:85172002802
ISSN
0022-2313
DOI
10.1016/j.jlumin.2023.120216
language
English
LU publication?
yes
id
4e7e2e5a-5e36-4738-a9e1-677460d9cce3
date added to LUP
2024-02-01 15:16:34
date last changed
2024-02-01 15:18:39
@article{4e7e2e5a-5e36-4738-a9e1-677460d9cce3,
  abstract     = {{<p>Luminescence properties of undoped Li<sub>6</sub>Y(BO<sub>3</sub>)<sub>3</sub> (LYB) crystals grown by the Bridgman method as well as undoped and praseodymium doped LYB crystals grown by the Czochralski method were studied under excitation by ultraviolet light, synchrotron radiation and electron beam in the temperature region of 5–300 K. The emission bands peaking at 4.8, 3.76 and 2.95 eV were found in undoped Czochralski-grown crystals, while the band at 3.34 eV was dominant in the Bridgman-grown crystals. These bands are presumably ascribed to excitons localized at regular and defect-perturbed lattice sites. Intense emission bands peaking at 4.75, 4.50, 4.17 and 3.98 eV were discovered in Pr doped crystals at low temperatures and related to the interconfigurational 4f<sup>1</sup>5d<sup>1</sup> → 4f<sup>2</sup> radiative transitions in Pr<sup>3+</sup> ions. The structure of the emission spectrum is shown to be determined by the <sup>3</sup>H<sub>4</sub>, <sup>3</sup>H<sub>5</sub>, <sup>3</sup>H<sub>6</sub>, <sup>3</sup>F<sub>2</sub>, <sup>3</sup>F<sub>3</sub>, <sup>3</sup>F<sub>4</sub> terms of the Pr<sup>3+</sup> ion. The characteristic decay time of the 4f<sup>1</sup>5d<sup>1</sup> → 4f<sup>2</sup> emission is τ = 24 ns at low temperatures, however, it shortens to 9 ns by room temperature due to a strong thermal quenching. The study of glow curves and spectra of thermostimulated luminescence in Li<sub>6</sub>Y(BO<sub>3</sub>)<sub>3</sub>:Pr crystal irradiated by 10-keV electron beam shows that Pr<sup>3+</sup> ions do not participate in an electron-hole recombination process.</p>}},
  author       = {{Romet, I. and Tichy-Rács and Lengyel, K. and Feldbach, E. and Kovács, L. and Corradi, G. and Chernenko, K. and Kirm, M. and Spassky, D. and Nagirnyi, V.}},
  issn         = {{0022-2313}},
  keywords     = {{Fast luminescence; Lithium yttrium borate crystals; Pr 5d-4f emission; Synchrotron radiation}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Journal of Luminescence}},
  title        = {{Interconfigurational d-f luminescence of Pr<sup>3+</sup> ions in praseodymium doped Li<sub>6</sub>Y(BO<sub>3</sub>)<sub>3</sub> single crystals}},
  url          = {{http://dx.doi.org/10.1016/j.jlumin.2023.120216}},
  doi          = {{10.1016/j.jlumin.2023.120216}},
  volume       = {{265}},
  year         = {{2024}},
}