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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.
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Publication Date:
Report Number(s):
Journal ID: ISSN 0022-2313; PII: S0022231316305324
Grant/Contract Number:
AC02-07CH11358; 316906
Accepted Manuscript
Journal Name:
Journal of Luminescence
Additional Journal Information:
Journal Volume: 189; Journal Issue: C; Journal ID: ISSN 0022-2313
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE; European Union (EU)
Country of Publication:
United States
36 MATERIALS SCIENCE; β-NaGdF4; Nanoparticles; Room temperature synthesis; Europium; Erbium
OSTI Identifier: