Eco-Friendly Luminescent Hybrid Materials Based on EuIII and LiI Co-Doped Chitosan

Author(s)

Raquel Alves ^[1] ; Leandro P. Ravaro ^[2] ; Agnieszka Pawlicka ^[3] ; Maria Manuela Silva ^[4] ; Andrea S. S. de Camargo ^[5]

Affiliation

^[1] Universidade do Minho. Centro de Química - Portugal

^[2] Universidade de São Paulo. Instituto de Física de São Carlos - Brasil

^[3] Universidade de São Paulo. Instituto de Química de São Carlos - Brasil

^[4] Universidade do Minho. Centro de Química - Portugal

^[5] Universidade de São Paulo. Instituto de Física de São Carlos - Brasil

• Document type: Journal article
• Source: Journal of the Brazilian Chemical Society; v. 26, n. 12, p. 2590-2597, 2015-12-00.

Abstract

Biopolymer-based materials have been of particular interest as alternatives to synthetic polymers due to their low toxicity, biodegradability and biocompatibility. Among them, chitosan is one of the most studied ones and has recently been investigated for the application as solid state polymer electrolytes. Furthermore, it can serve as a host for luminescent species such as rare earth ions, opening up the possibility of combined electro-optical functionality, of particular interest for electroluminescent devices. In this study, we perform a fundamental, initial, investigation of chitosan based luminescent materials doped with EuIII and LiI triflate salts, from the structural, photophysical and conducting points of view. Because the host presents a broad emission band in the blue to green, while EuIII emits in the red, fine-tuning of emission colour and/or generation of white light is proven possible, by proper combination of optimized composition and excitation scheme. Europium lifetimes (5D0) are in the range 270-350 µs and quantum yields are up to 2%. Although LiI does not interfere with the luminescent properties, it grants ion-conducting properties to the material suggesting that a combination of both properties could be useful in the development of electro-luminescent devices. (AU)

• FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
• Grantee: Edgar Dutra Zanotto
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 13/24727-7 - New Optical Materials Based on Polynuclear Copper(I) Halide Cluster Complexes Immobilized in Solid Host Matrices
• Grantee: Leandro Piaggi Ravaro
• Support Opportunities: Scholarships in Brazil - Post-Doctoral