Ravaro, Leandro P.
Silva, Maria Manuela
de Camargo, Andrea S. S.
Número total de Autores: 5
Afiliação do(s) autor(es):
 Univ Minho, Ctr Quim, P-4710057 Braga - Portugal
 Univ Sao Paulo, Inst Fis Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil
 Univ Sao Paulo, Inst Quim Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil
Número total de Afiliações: 3
Tipo de documento:
Journal of the Brazilian Chemical Society;
Citações Web of Science:
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)