Study of the energy transfer process in rare earth-doped silk fibroin for future application in luminescent compounds

Pugina, Roberta S.; Rocha, Euzane G. da; Ribeiro, Sidney José Lima; Caiut, José Maurício A.

doi:10.1016/j.jlumin.2018.09.050

Cited by 12 publications

(7 citation statements)

References 29 publications

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“…The emission spectra of [Eu(btfa) 3 (dmbpy)] (light gray line), SF/Eu films (gray line), and the deposited SF/Eu patterns (black line) are shown in Figure a, for excitation at 310 nm. The emission spectrum of the pure [Eu(btfa) 3 (dmbpy)] complex (light gray) is characterized by the transitions 5 D 0 → 7 F J ( J = 0, 1, 2, 3 and 4) dominated by the hypersensitive 5 D 0 → 7 F 2 transition around 614 nm. − These transitions appear in 5 D 0 → 7 F 0 (581 nm), 5 D 0 → 7 F 1 (592 and 597 nm), 5 D 0 → 7 F 2 (614, 619, and 627 nm), 5 D 0 → 7 F 3 (654 nm), 5 D 0 → 7 F 4 (690, 694, 698, 702, and 705 nm), 5 D 0 → 7 F 0 (581 nm), 5 D 0 → 7 F 1 (592 and 597 nm), 5 D 0 → 7 F 2 (614, 617 and 627 nm), 5 D 0 → 7 F 3 (652 nm), and 5 D 0 → 7 F 4 (692, 694, and 705 nm) for the SF/Eu film (gray line).…”

Section: Resultsmentioning

confidence: 99%

Direct Femtosecond Laser Printing of Silk Fibroin Microstructures

Santos

Paula

Andrade

et al. 2020

ACS Appl. Mater. Interfaces

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Fabrication of functional silk fibroin microstructures has extensive applications in biotechnology and photonics. Considerable progress has been made based on lithographic methods and self-assembly approaches. However, most methods require chemical modification of silk fibroin, which restricts the functionalities of the designed materials. At the same time, femtosecond laser-induced forward transfer (fs-LIFT) has been explored as a simple and attractive processing tool for microprinting of high-resolution structures. In this paper, we propose the use of LIFT with fs-pulses for creating high-resolution structures of regenerated silk fibroin (SF). Furthermore, upon adding Eu3+/Tb3+ complexes to SF, we have been able to demonstrate the printing by LIFT of luminescent SF structures with a resolution on the order of 2 μm and without material degradation. This approach provides a facile method for printing well-defined two-dimensional (2D) micropatterns of pure and functionalized SF, which can be used in a wide range of optical and biomedical applications.

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Section: Resultsmentioning

confidence: 99%

Direct Femtosecond Laser Printing of Silk Fibroin Microstructures

Santos

Paula

Andrade

et al. 2020

ACS Appl. Mater. Interfaces

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“…Europium ions are assembled in an SF matrix, and the Bombyx mori SF bears aromatic amino acids, such as tyrosine (Tyr) and tryptophan (Trp), that can function as fluorescent probes. The energy of the Trp triplet state allows efficient energy transfer from Trp to the Tb 3+ ion (Pugina et al, 2019). The MMA method shows the efficient and uniform integration of the luminescent compounds with SF materials, and it is not limited to the above functional materials.…”

Section: In Vitro Functionalizationmentioning

confidence: 99%

Interplay between Light and Functionalized Silk Fibroin and Applications

Lin

Liu

2020

iScience

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Silkworm silk has been considered to be a luxurious textile for more than five thousand years. Native silk fibroin (SF) films have excellent (ca. 90%) optical transparency and exhibit fluorescence under UV light. The silk dyeing process is very important and difficult, and methods such as pigmentary coloration and structural coloration have been tested for coloring silk fabrics. To functionalize silk that exhibits fluorescence, the in vivo and in vitro assembly of functional compounds with SF and the resulting amplification of fluorescence emission are examined. Finally, we discuss the applications of SF materials in basic optical elements, light energy conversion devices, photochemical reactions, sensing, and imaging. This review is expected to provide insight into the interaction between light and silk and to inspire researchers to develop silk materials with a consideration of history, material properties, and future prospects.

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“…[78][79][80] Em particular, suas propriedades luminescentes, conferidas pelas intensas e estreitas bandas de emissão, resultantes de transições do tipo f-f, geram cores específicas em dispositivos luminescentes. 81,82 Assim, materiais luminescentes contendo terras raras possuem extensa aplicação em dispositivos de iluminação, como displays emissores e lâmpadas fluorescentes, 83,84 sendo extensamente processados na forma de luminóforos de estado sólido, [85][86][87][88][89][90][91][92][93][94][95][96][97][98][99] materiais híbridos e compostos de coordenação, [100][101][102][103][104][105][106][107][108] vidros, [109][110][111][112][113][114] híbridos magnéticos-luminescentes, 115,116 entre muitos outros. Além disso, a utilização de ferramentas teóricas para a descrição da luminescência de lantanídeos é extremamente útil para o aprimoramento e adaptação das propriedades observadas.…”

Section: Aplicaçõesunclassified

Terras Raras: Tabela Periódica, Descobrimento, Exploração No Brasil E Aplicações

2019

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In the ~150 years comprised between the discovery of yttrium (1794) and promethium (1947), the rare earth metals were an incomplete chapter and a stone in the shoe of the periodic classification of the chemical elements. This group of 17 elements with remarkable chemical similarity raised confusion on many brilliant scientists, including Mendeleev, and led to the consolidation of many theories in Chemistry, from atomic spectroscopy to quantum theory. Nowadays we know that the special properties of these elements arise from filling 4f orbitals, which results in unique spectroscopic, magnetic and catalytic behavior. Such properties make rare earths essential elements on optical devices, lasers, telecommunications and magnetic materials for sustainable energy. The importance of rare earths far exceeds the science and technology domains, reaching the same level of other strategic materials for energy and defense. Hence, this work presents a brief discussion about the historical path of the rare earth elements in the Periodic Table and about the exploration of these resources in Brazil, detailing some of the extractive activities since the 19 th century and some perspectives for future activities concerning this group of elements in Brazil.

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Study of the energy transfer process in rare earth-doped silk fibroin for future application in luminescent compounds

Cited by 12 publications

References 29 publications

Direct Femtosecond Laser Printing of Silk Fibroin Microstructures

Direct Femtosecond Laser Printing of Silk Fibroin Microstructures

Interplay between Light and Functionalized Silk Fibroin and Applications

Terras Raras: Tabela Periódica, Descobrimento, Exploração No Brasil E Aplicações

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