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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Alves, Raquel [1] ; Ravaro, Leandro P. [2] ; Pawlicka, Agnieszka [3] ; Silva, Maria Manuela [1] ; de Camargo, Andrea S. S. [2]
Total Authors: 5
Affiliation:
[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
Total Affiliations: 3
Document type: Journal article
Source: Journal of the Brazilian Chemical Society; v. 26, n. 12, p. 2590-2597, DEC 2015.
Web of Science Citations: 6
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 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)

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 type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
Grantee:Edgar Dutra Zanotto
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC