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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.)

Fine tuning of polymer content for enhanced structure and luminescent properties of Eu3+:siloxane-poly(methyl methacrylate) hybrids to be applied in photonics

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de Jesus, Filipe Augusto [1] ; Santana, Barbara Vasconcelos [1] ; Cunha Bispo, Giordano Frederico [2] ; Silva Filho, Cicero Inacio [3] ; Alves Junior, Severino [3] ; Giroldo Valerio, Mario Ernesto [2] ; Almeida Caiut, Jose Mauricio [4] ; Vitorino Sarmento, Victor Hugo [1]
Total Authors: 8
[1] Univ Fed Sergipe, Dept Chem, Av Vereador Olimpio Grande S-N, Itabaiana, SE - Brazil
[2] Univ Fed Sergipe, Dept Phys, Av Marechal Rondon S-N, Sao Cristovao, SE - Brazil
[3] Univ Fed Pernambuco, Grad Program Mat Sci, Av Prof Moraes Rego 1235, Cidade Univ, BR-1235 Recife, PE - Brazil
[4] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Quim, BR-14040901 Ribeirao Preto, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Polymer; v. 181, OCT 24 2019.
Web of Science Citations: 0

The increasing demand for multifunctional materials for use in several application fields has been encouraging research into luminescent hybrid materials. These have the advantage of combining features of both organic and inorganic matter, which can be tailored to enhance emission conditions. This work aims to elucidate structural/ luminescence relations of Eu3+:siloxane-poly(methyl methacrylate) hybrid materials. Polymer content was evaluated through characterization of samples with increasing polymer/Si molar ratios. Results showed that the sample with the highest amount of polymer in its composition, PMMA8, had optimized emission features on account of the larger number of carbonyl groups available for Eu3+ coordination. This enhancement is evidenced by the quantum efficiency (q) and lifetime (tau(exp)) values, which were considerably higher (q = 24.7% and tau(exp )= 0.62 ms) for PMMA8 hybrid than for the other samples. Thus, the hydrophobic polymer reduced the interaction of dopant ions to hydroxyl quenching groups and led to better dispersion, minimizing ion-ion energy transfer. (AU)

Grantee:José Maurício Almeida Caiut
Support type: Regular Research Grants