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Title: Room temperature synthesis of β-NaGdF 4 : RE 3+ (RE= Eu, Er) nanocrystallites and their luminescence

In this study, a room temperature synthesis was developed for phase pure β-NaGdF 4 nanocrystallites as well as 5, 10, and 20% Eu 3+ or 5% Er 3+ doped material. Rare earth acetates and NaCl react in a 1:2 M ratio with a variable excess of NH 4F in ethylene glycol within 24 hours. Since the thermodynamic stability of the hexagonal phase decreases along the lanthanide series, a larger excess of NH 4F was required for the synthesis of luminescent samples doped with the smaller Er 3+ ions than for Eu 3+ doped or pure β-NaGdF 4. The materials were characterized by powder X-ray diffraction, electron microscopy, and luminescence spectroscopy. The Eu 3+-doped samples show 5D 07F J and 5D 17F J luminescence after Eu 3+ excitation at 394 nm or Gd 3+ excitation at 273 nm and 308 nm. The ratio of 5D 1 vs. 5D 0 luminescence is influenced by the excitation wavelength and the Eu 3+ concentration. Lastly, the Er 3+-doped samples show green and red upconversion luminescence, respectively, from the 2H 11/2+ 4S 3/24I 15/2 and 4F 9/24I 15/2 transitions after 970 nm excitation.
Authors:
; ;
Publication Date:
Report Number(s):
IS-J-9034
Journal ID: ISSN 0022-2313; PII: S0022231316305324
Grant/Contract Number:
AC02-07CH11358; 316906
Type:
Accepted Manuscript
Journal Name:
Journal of Luminescence
Additional Journal Information:
Journal Volume: 189; Journal Issue: C; Journal ID: ISSN 0022-2313
Publisher:
Elsevier
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE; European Union (EU)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; β-NaGdF4; Nanoparticles; Room temperature synthesis; Europium; Erbium
OSTI Identifier:
1355356

Tessitore, Gabriella, Mudring, Anja-Verena, and Kr?mer, Karl W. Room temperature synthesis of β-NaGdF 4 : RE 3+ (RE= Eu, Er) nanocrystallites and their luminescence. United States: N. p., Web. doi:10.1016/j.jlumin.2017.03.021.
Tessitore, Gabriella, Mudring, Anja-Verena, & Kr?mer, Karl W. Room temperature synthesis of β-NaGdF 4 : RE 3+ (RE= Eu, Er) nanocrystallites and their luminescence. United States. doi:10.1016/j.jlumin.2017.03.021.
Tessitore, Gabriella, Mudring, Anja-Verena, and Kr?mer, Karl W. 2017. "Room temperature synthesis of β-NaGdF 4 : RE 3+ (RE= Eu, Er) nanocrystallites and their luminescence". United States. doi:10.1016/j.jlumin.2017.03.021. https://www.osti.gov/servlets/purl/1355356.
@article{osti_1355356,
title = {Room temperature synthesis of β-NaGdF 4 : RE 3+ (RE= Eu, Er) nanocrystallites and their luminescence},
author = {Tessitore, Gabriella and Mudring, Anja-Verena and Kr?mer, Karl W.},
abstractNote = {In this study, a room temperature synthesis was developed for phase pure β-NaGdF4 nanocrystallites as well as 5, 10, and 20% Eu3+ or 5% Er3+ doped material. Rare earth acetates and NaCl react in a 1:2 M ratio with a variable excess of NH4F in ethylene glycol within 24 hours. Since the thermodynamic stability of the hexagonal phase decreases along the lanthanide series, a larger excess of NH4F was required for the synthesis of luminescent samples doped with the smaller Er3+ ions than for Eu3+ doped or pure β-NaGdF4. The materials were characterized by powder X-ray diffraction, electron microscopy, and luminescence spectroscopy. The Eu3+-doped samples show 5D0→7FJ and 5D1→7FJ luminescence after Eu3+ excitation at 394 nm or Gd3+ excitation at 273 nm and 308 nm. The ratio of 5D1 vs. 5D0 luminescence is influenced by the excitation wavelength and the Eu3+ concentration. Lastly, the Er3+-doped samples show green and red upconversion luminescence, respectively, from the 2H11/2+4S3/2→4I15/2 and 4F9/2→4I15/2 transitions after 970 nm excitation.},
doi = {10.1016/j.jlumin.2017.03.021},
journal = {Journal of Luminescence},
number = C,
volume = 189,
place = {United States},
year = {2017},
month = {9}
}