Synthesis, Structure and Photoluminescent Properties of Eu:Gd2O3 Nanophosphor Synthesized by cw CO2 Laser Vaporization
Научная публикация
| Общая информация |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Оригинальная
|
| Журнал |
Journal of Luminescence
ISSN: 0022-2313
|
| Вых. Данные |
Год: 2021,
Том: 235,
Номер статьи
: 118050,
Страниц
: 11
DOI:
10.1016/j.jlumin.2021.118050
|
| Ключевые слова |
Eu3+ ions; Laser vaporization; Monoclinic Gd2O3; Nanophosphors; Photoluminescence |
| Авторы |
Kostyukov Anton I.
1
,
Snytnikov Valeriy N.
2
,
Snytnikov Vladimir N.
2
,
Rakhmanova Marianna I.
3
,
Kostyukova Nadezhda Y.
1,4,5
,
Ishchenko Arcady V.
1,2
,
Cherepanova Svetlana V.
1,2
,
Krylov Alexander S.
6
,
Aleksandrovsky Aleksandr S.
6,7
|
| Организации |
| 1 |
Novosibirsk State University, Pirogova Str. 2, 630090, Novosibirsk, Russia
|
| 2 |
Boreskov Institute of Catalysis SB RAS, Lavrentieva Ave. 5, 630090, Novosibirsk, Russia
|
| 3 |
Nikolaev Institute of Inorganic Chemistry SB RAS, Akad. Lavrentiev Ave. 3, 630090, Novosibirsk, Russia
|
| 4 |
Institute of Laser Physics SB RAS, Lavrentyev Ave. 15b, 630090, Novosibirsk, Russia
|
| 5 |
Novosibirsk State Technical University, K. Marx Ave. 20, 630073, Novosibirsk, Russia
|
| 6 |
Kirensky Institute of Physics Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
|
| 7 |
Department of Photonics and Laser Technology, Siberian Federal University, Krasnoyarsk, 660041, Russia
|
|
Информация о финансировании (1)
|
1
|
Российский фонд фундаментальных исследований
|
19-32-60027 (АААА-А19-119110590010-0)
|
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.