A Europium(III) Complex Embedded in a Polysulfone Host Matrix: A Flexible Film with Temperature-Responsive Ratiometric Behaviour

Mani Outis, João P. Leal, João Avó, Bernardo Monteiro, Cláudia C. L. Pereira

Research output: Contribution to journalArticlepeer-review

Abstract

An emissive europium(III) complex [C2 mim][Eu(fod)4 ] (1; C2 mim=1-ethyl-3-methyl-imidazolium; fod=1,1,1,2,2,3,3-heptafluoro-7,7-dimethyloctane-4,6-dionate) was prepared. The complex shows ratiometric thermal behaviour up to 155 °C. These unusual temperature-dependent properties arise from a solid-solid phase transition that promotes increased contact between the anion and the cation, affecting the emission profile of the emissive anion in two different ratiometric relations. A ultrabright and flexible emissive photopolymer film was obtained using polysulfone (PSU) as the host matrix of 10 % (w/w) of 1, that also induced changes on the lanthanide emissive profile with temperature. A temperature-responsive luminescent film 1/PSU is sensitivr to heating between 100 and 155 °C. Also, the emission lifetime of 1 was not affected by confinement in PSU, while its emission quantum yield was reduced from 82 to 59 %.

Original languageEnglish
Pages (from-to)2629-2635
Number of pages7
JournalCHEMPLUSCHEM
Volume85
Issue number12
DOIs
Publication statusPublished - 1 Dec 2020

Keywords

  • Lanthanides
  • luminescence
  • phase transitions
  • thermal response
  • thin films

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