Crystal phase transition in LixNa1-xGdF4 solid solution nanocrystals - Tuning of optical properties

Mateusz Bański, Mohammad Afzaal, Dong Kyu Cha, X. Wang, Hua Tan, Jan J. Misiewicz, Artur P. Podhorodecki

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

The influence of precursor composition on the crystallization of LixNa1-xGdF4 is investigated and discussed. Nanocrystals are prepared from the thermal decomposition of trifluoroacetates in the presence of trioctylphosphine oxide to provide control over particle size. A crystal phase transition from hexagonal to cubic and to tetragonal is observed by increasing lithium trifluoroacetate (Li-TFA) in the solution. Controlling the composition of LixNa1-xGdF4 nanocrystals results in modified crystal field symmetry and emission properties from doped europium (Eu3+) ions. We report that for lithium (Li+) substitution <15%, the hexagonal crystal field is preferred, while the Eu3+ emission is already tuned, whereas at higher Li+ substitution, a phase change takes place and the number of crystalline matrix defects increases which is reflected in the optical properties of Eu3+. From Eu3+ emission properties, the optimum Li+ content is determined to be ∼6.2% in the prepared LixNa1-xGdF4 nanocrystals.
Original languageEnglish (US)
Pages (from-to)9911-9917
Number of pages7
JournalJ. Mater. Chem. C
Volume2
Issue number46
DOIs
StatePublished - Sep 29 2014

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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