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

8 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

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The authors would like to thank the National Centre for Research and Development for their financial support under the LIDER project no. 014/L-2/10. MB would like to acknowledge The Iuventus Plus program (no. IP2011 001271) and Foundation for Polish Science (FNP) "Start" program for the financial support. MA wishes to acknowledge NSTIP strategic technologies program number (12-ENE3204-04) for the financial support.

ASJC Scopus subject areas

  • General Chemistry
  • Materials Chemistry

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