Green Li+- and Er3+-doped poly(ε-caprolactone)/siloxane biohybrid electrolytes for smart electrochromic windows

Significance Statement

   Novel LiCF3SO3– and Er(CF3SO3)3-based di-urethane cross-linked PCL(530)/siloxane biohybrid electrolytes, where PCL corresponds to poly(e-caprolactone) and 530 is the corresponding average molecular weight (in g mol-1), were prepared by means of the sol-gel method and in the light of the “mixed cation effect”. The two salts were added in a 50:50 molar ratio. Prototype electrochromic devices (ECDs) incorporating these materials displayed fast switching speed, high electrochromic reversibility and cyclic stability, with good coloration efficiency and open circuit memory. The visible average transmittance variation and the optical density change were 41.6 % and 0.39, respectively. The electrolytes exhibit room-temperature emission from the UV/VIS to the NIR spectral regions, being attractive candidates for the fabrication of active ECDs for lighting applications.     

 

 

Green Li+- and Er3+-doped poly(ε-caprolactone)/siloxane biohybrid electrolytes for smart electrochromic windows

Solar Energy Materials and Solar Cells, Volume 123, April 2014, Pages 203-210.

M. Fernandes, V.T. Freitas, S. Pereira, E. Fortunato, R.A.S. Ferreira, L.D. Carlos, R. Rego, V. de Zea Bermudez.

Chemistry Department and CQ-VR, University of Trás-os-Montes e Alto Douro, 5000-801 Vila Real, Portugal and

Physics Department and CICECO, University of Aveiro, 3810-193 Aveiro, Portugal and

CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa and CEMOP-UNINOVA, 2829-516 Caparica, Portugal.

 

Abstract

 

Novel electrolytes composed of a sol–gel derived di-urethane cross-linked poly(ε-caprolactone) (d-PCL(530))/siloxane (where 530 is the average molecular weight in g mol−1) biohybrid network doped with a 50:50 molar mixture of lithium and erbium triflates were prepared in the light of the “mixed cation effect”. These environmentally friendly electrolytes, which are multi-wavelength emitters from the UV/VIS to the NIR spectral regions, are attractive candidates for electrochromic devices. Prototype devices based on a glass/ITO/WO3/electrolyte/ITO/glass layered configuration exhibited fast switching speed, high electrochromic reversibility and cyclic stability, along with good coloration efficiency and open circuit memory. The visible average transmittance variation and the optical density change attained were 41.6% and 0.39, respectively. The combined use of these electrolytes with transparent conducting oxides in the VIS and NIR spectral regions opens exciting new prospects for the fabrication of electrochromic windows exhibiting NIR emission and improved performance in terms of energy efficiency in buildings. In addition, these electrolytes offer new possibilities for the production of dual light emitting and electrochromic windows.

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