Eco-Friendly Luminescent Hybrid Materials Based on Eu-III and Li-I Co-Doped Chitosan

Autor(es)

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

Afiliação do(s) autor(es)

^[1] Univ Minho, Ctr Quim, P-4710057 Braga - Portugal

^[2] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil

^[3] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 26, n. 12, p. 2590-2597, DEC 2015.
• Citações Web of Science: 6

Resumo

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 Eu-III and Li-I 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 Eu-III 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 (D-5(0)) are in the range 270-350 mu s 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)

• Processo FAPESP: 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros
• Beneficiário: Edgar Dutra Zanotto
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 13/24727-7 - Novos materiais ópticos baseados em Complexos Polinucleares de Clusters de Haleto de Cobre(I) imobilizados em matrizes hospedeiras sólidas
• Beneficiário: Leandro Piaggi Ravaro
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado