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

Tessitore, Gabriella; Mudring, Anja-Verena; Kr?mer, Karl W.

doi:10.1016/j.jlumin.2017.03.021

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

Journal Article · Fri Sep 01 00:00:00 EDT 2017 · Journal of Luminescence

DOI:https://doi.org/10.1016/j.jlumin.2017.03.021· OSTI ID:1355356

Tessitore, Gabriella; Mudring, Anja-Verena; Kr?mer, Karl W.

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→⁷F_J and ⁵D₁→⁷F_J 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 ²H_11/2+⁴S_3/2→⁴I_15/2 and ⁴F_9/2→⁴I_15/2 transitions after 970 nm excitation.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE; European Union (EU)

Grant/Contract Number:: AC02-07CH11358; 316906

OSTI ID:: 1355356

Report Number(s):: IS-J-9034; PII: S0022231316305324

Journal Information:: Journal of Luminescence, Vol. 189, Issue C; ISSN 0022-2313

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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