Light emitting silica nanostructures by surface functionalization of diatom algae shells with a triethoxysilane-functionalized π-conjugated fluorophore

MRS Advances ◽  
2015 ◽  
Vol 1 (57) ◽  
pp. 3817-3823 ◽  
Author(s):  
Danilo Vona ◽  
Marco Lo Presti ◽  
Stefania Roberta Cicco ◽  
Fabio Palumbo ◽  
Roberta Ragni ◽  
...  
Keyword(s):  
Surface Functionalization ◽  
Organic Dye ◽  
Diatom Algae ◽  
Thalassiosira Weissflogii ◽  
Light Emitting ◽  
Biotechnological Approach ◽  
Silica Nanostructures ◽  
Organic Fluorophore ◽  
Living Diatoms

ABSTRACTThe functionalization of biosilica shells (frustules) of diatoms microalgae with a tailored luminescent molecule is a convenient, scalable and biotechnological approach for obtaining new light emitting silica nanostructures with promising applications in photonics. In particular, here we report the synthesis of a red emitting organic fluorophore and its covalent linking to the surface of mesoporous biosilica extracted from Thalassiosira weissflogii diatoms cultured in our laboratories. The organic dye has a conjugated skeleton composed of thienyl, benzothiadiazolyl and phenyl units and a peripheral triethoxysilyl group which enables its stable binding onto the frustules surface. The protocol to extract the biosilica shells from living diatoms preserving their natural ornate nanostructured morphology is also discussed.

In vivo doped biosilica from living Thalassiosira weissflogii diatoms with a triethoxysilyl functionalized red emitting fluorophore

MRS Advances ◽  
2018 ◽  
Vol 3 (27) ◽  
pp. 1509-1517 ◽  
Author(s):  
M. Lo Presti ◽  
R. Ragni ◽  
D. Vona ◽  
G. Leone ◽  
S. Cicco ◽  
...  
Keyword(s):  
Nanostructured Materials ◽  
Organic Dye ◽  
Natural Source ◽  
Dye Molecules ◽  
Thalassiosira Weissflogii ◽  
Light Emitting ◽  
Wide Range ◽  
Novel Strategy ◽  
Highly Porous

ABSTRACTDiatoms microalgae represent a natural source of highly porous biosilica shells (frustules) with promising applications in a wide range of technological fields. Functionalization of diatoms’ frustules with tailored luminescent molecules can be envisaged as a convenient, scalable biotechnological route to new light emitting silica nanostructured materials. Here we report a straightforward protocol for the in vivo modification of Thalassiosira weissflogii diatoms’ frustules with a red emitting organic dye based on thienyl, benzothiadiazolyl and phenyl units. The metabolic insertion of the dye molecules into the diatoms shells, combined with an acidic-oxidative isolation protocol of the resulting dye stained biosilica, represents a novel strategy to develop highly porous luminescent biosilica nanostructures with promising applications in photonics.

Novel blue light emitting graphene oxide nanosheets fabricated by surface functionalization

2012 ◽  
Vol 22 (7) ◽  
pp. 2929-2934 ◽  
Author(s):  
Yizhong Lu ◽  
Yuanyuan Jiang ◽  
Wentao Wei ◽  
Haibin Wu ◽  
Minmin Liu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Blue Light ◽  
Surface Functionalization ◽  
Graphene Oxide Nanosheets ◽  
Light Emitting

scholarly journals Slow recombination of spontaneously dissociated organic fluorophore excitons

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Takahiko Yamanaka ◽  
Hajime Nakanotani ◽  
Chihaya Adachi
Keyword(s):  
Solid State ◽  
Quantum Yield ◽  
Organic Molecules ◽  
Light Emission ◽  
Binding Energies ◽  
Electrical Excitation ◽  
Exciton Dissociation ◽  
Light Emitting ◽  
Solid Films ◽  
Organic Fluorophore

AbstractThe harvesting of excitons as luminescence by organic fluorophores forms the basis of light-emitting applications. Although high photoluminescence quantum yield is essential for efficient light emission, concentration-dependent quenching of the emissive exciton is generally observed. Here we demonstrate generation and accumulation of concentration-dependent “long-lived” (i.e., over 1 h) photo-generated carriers and the successive release of their energy as electroluminescence in a solid-state film containing a polar fluorophore. While fluorophore excitons are generally believed to be stable because of their high exciton binding energies, our observations show that some of the excitons undergo spontaneous exciton dissociation in a solid-state film by spontaneous orientation polarization even without an external electric field. These results lead to the reconsideration of the meaning of “luminescence quantum yield” for the solid films containing polar organic molecules because it can differ for optical and electrical excitation.

scholarly journals Biosilica from Living Diatoms: Investigations on Biocompatibility of Bare and Chemically Modified Thalassiosira weissflogii Silica Shells

2016 ◽  
Vol 3 (4) ◽  
pp. 35 ◽  
Author(s):  
Stefania Cicco ◽  
Danilo Vona ◽  
Roberto Gristina ◽  
Eloisa Sardella ◽  
Roberta Ragni ◽  
...  
Keyword(s):  
Thalassiosira Weissflogii ◽  
Chemically Modified ◽  
Living Diatoms

Superductile, Wavy Silica Nanostructures Inspired by Diatom Algae

2011 ◽  
Vol 13 (10) ◽  
pp. B405-B414 ◽  
Author(s):  
Andre P. Garcia ◽  
Nicola Pugno ◽  
Markus J. Buehler
Keyword(s):  
Diatom Algae ◽  
Silica Nanostructures

Mannose modified zwitterionic polyester conjugated second near-infrared organic fluorophore for targeted photothermal therapy

2021 ◽  
Author(s):  
Jiaxu Li ◽  
Liuchun Zheng ◽  
Chuncheng Li ◽  
Yaonan Xiao ◽  
Jiajian Liu ◽  
...  
Keyword(s):  
Small Molecule ◽  
Photothermal Therapy ◽  
Near Infrared ◽  
Organic Dye ◽  
Clinical Treatment ◽  
Available P ◽  
Cancer Resistance ◽  
Organic Fluorophore ◽  
Huge Challenge

Cancer resistance has been the huge challenge to clinical treatment. Photothermal therapy of second near-infrared (NIR-II) organic dye small molecule has been used to conquer cancer resistance. However, the available...

scholarly journals Energy down converting organic fluorophore functionalized mesoporous silica hybrids for monolith-coated light emitting diodes

2017 ◽  
Vol 13 ◽  
pp. 768-778 ◽  
Author(s):  
Markus Börgardts ◽  
Thomas J J Müller
Keyword(s):  
Mesoporous Silica ◽  
Hybrid Materials ◽  
Light Emitting Diodes ◽  
Uv Light ◽  
Nile Red ◽  
Covalent Attachment ◽  
Light Emitting ◽  
Functionalized Mesoporous Silica ◽  
Cie Chromaticity ◽  
Organic Fluorophore

The covalent attachment of organic fluorophores in mesoporous silica matrices for usage as energy down converting phosphors without employing inorganic transition or rare earth metals is reported in this article. Triethoxysilylpropyl-substituted derivatives of the blue emitting perylene, green emitting benzofurazane, and red emitting Nile red were synthesized and applied in the synthesis of mesoporous hybrid materials by postsynthetic grafting to commercially available MCM-41. These individually dye-functionalized hybrid materials are mixed in variable ratios to furnish a powder capable of emitting white light with CIE chromaticity coordinates of x = 0.33, y = 0.33 and an external quantum yield of 4.6% upon irradiation at 410 nm. Furthermore, as a proof of concept two different device setups of commercially available UV light emitting diodes, are coated with silica monoliths containing the three triethoxysilylpropyl-substituted fluorophore derivatives. These coatings are able to convert the emitted UV light into light with correlated color temperatures of very cold white (41100 K, 10700 K) as well as a greenish white emission with correlated color temperatures of about 5500 K.

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