Luminescent Electrochromic Device Based on a Biohybrid Electrolyte Doped With a Mixture of Potassium Triflate and a Europium beta-diketonate Complex


An amorphous poly(epsilon-caprolactone) (PCL(530))/siloxane hybrid doped with potassium triflate (KCF3SO3) and Eu(btfac)(3)phen (where btfac(-) is 4,4,4-trifluoro-1-phenyl-2,4-butanedionate and phen is 1,10-phenantroline) was synthesized by the sol-gel method. This hybrid exhibits a maximum and constant absolute emission quantum yield value of 0.26 +/- 0.03 under excitation within 330-360 nm. The performance of a prototype ECD based on a glass/ITO/WO3/electrolyte/NiO/ITO/glass incorporating this material is very encouraging. The device exhibited switching time around 50 s, an optical density change of 0.06, and a coloration efficiency of 23 cm(2)C(-1) in the 2nd cycle. This work demonstrates that the combined use of an ionic salt and a lanthanide complex as active species of an ECD's electrolyte offers attractive new prospects for the fabrication of light emitting electrochromic windows.



subject category

Electrochemistry; Science & Technology - Other Topics


Fernandes, M; Botas, AMP; Leones, R; Pereira, S; Silva, MM; Ferreira, RAS; Carlos, LD; Fortunato, E; Rego, R; Bermudez, VD

our authors


This work was supported by Fundaao para a Cincia e a Tecnologia ( FCT) and FEDER ( contracts PTDC/ CTM- BPC/ 112774/ 2009, PEst- C/ QUI/ UI0686/ 2013, PestC/ CTM/ LA0011/ 2013 and Pest- OE/ QUI/ UI0616/ 2014) and COST Action MP1202

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