Synthesis, Structure and Photoluminescent Properties of Eu:Gd2O3 Nanophosphor Synthesized by cw CO2 Laser Vaporization Full article
| Journal |
Journal of Luminescence
ISSN: 0022-2313 |
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| Output data | Year: 2021, Volume: 235, Article number : 118050, Pages count : 11 DOI: 10.1016/j.jlumin.2021.118050 | ||||||||||||||
| Tags | Eu3+ ions; Laser vaporization; Monoclinic Gd2O3; Nanophosphors; Photoluminescence | ||||||||||||||
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| Affiliations |
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Funding (1)
| 1 | Russian Foundation for Basic Research | 19-32-60027 (АААА-А19-119110590010-0) |
Abstract:
Europium doped Gd2O3 sphere-like nanoparticles with dm = 9.3 ± 3.5 nm were synthesized by cw CO2 laser vaporization technique in a flowing mixture of argon and oxygen. According to XRD data, the Eu:Gd2O3 nanoparticles crystallize in the monoclinic symmetry class (C2/m space group). High-resolution luminescence spectroscopy study showed that the ultra-narrow 5D0 → 7F0 transition of Eu3+ demonstrates only two peaks corresponding to two inequivalent Cs positions of Eu3+ ion in monoclinic Gd2O3 lattice that is explained by the peculiarities of local environment of Eu3+ ion at these sites. The hypersensitive transition 5D0 → 7F2 dominates in the spectrum and is expanded to the red part of the spectrum in comparison with cubic Eu:Gd2O3 due to intense transitions terminating at higher-lying components of the crystal-field-split 7F2 state. In the luminescence spectrum, an additional weak band with the maximum at 407 nm corresponding to the electronic transitions 4f65 d1(7FJ) → 4f7(8S7/2) of Eu2+ was detected. The obtained values of chromaticity coordinates and absolute quantum yield are (0.644; 0.325) and ca. 1%, respectively. The phase transformations have been investigated using differential scanning calorimetry and thermogravimetry (50–1400 °C). After annealing in air at 700 °C, the monoclinic symmetry class of the Eu:Gd2O3 nanoparticles is preserved and the particle size increases to dm = 17.8 ± 6.1 nm. After annealing, the chromaticity coordinates (0.659; 0.334) and absolute quantum yield (ca. 4%) can be obtained using red phosphor based on monoclinic Gd2O3:Eu3+. The lifetime of the excited 5D0 state of Eu3+ in the annealed nanoparticles is longer than that in the as-synthesized nanoparticles, due to the suppression of nonradiative decay after annealing. © 2021 Elsevier B.V.
Cite:
Kostyukov A.I.
, Snytnikov V.N.
, Snytnikov V.N.
, Rakhmanova M.I.
, Kostyukova N.Y.
, Ishchenko A.V.
, Cherepanova S.V.
, Krylov A.S.
, Aleksandrovsky A.S.
Synthesis, Structure and Photoluminescent Properties of Eu:Gd2O3 Nanophosphor Synthesized by cw CO2 Laser Vaporization
Journal of Luminescence. 2021. V.235. 118050 :1-11. DOI: 10.1016/j.jlumin.2021.118050 WOS Scopus РИНЦ ANCAN OpenAlex
Synthesis, Structure and Photoluminescent Properties of Eu:Gd2O3 Nanophosphor Synthesized by cw CO2 Laser Vaporization
Journal of Luminescence. 2021. V.235. 118050 :1-11. DOI: 10.1016/j.jlumin.2021.118050 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Dec 9, 2020 |
| Accepted: | Mar 9, 2021 |
| Published online: | Mar 11, 2021 |
| Published print: | Jul 1, 2021 |
Identifiers:
| Web of science: | WOS:000641455600005 |
| Scopus: | 2-s2.0-85102474009 |
| Elibrary: | 46755124 |
| Chemical Abstracts: | 2021:646419 |
| Chemical Abstracts (print): | 174:884579 |
| OpenAlex: | W3136973143 |