Eu(III) complexation of phenyltrisalanine and phenylbisalanine in aqueous solution studied by photoluminescence and UV spectroscopy

Ionescu, Ruxandra D.; Frejd, Torbjörn

doi:10.1016/j.jlumin.2003.09.002

Cited by 2 publications

(2 citation statements)

References 34 publications

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“…In the PLE spectrum (Fig. 12) the interacting oxygen functionalities and Eu 3+ have shown a strong band at 314 nm 160,161 while the other five peaks are attributed to f-f transitions of the Eu 3+ ions. The authors suggest triple-exponential decay (average lifetime B391.13 ms) due to the differences in the ligand environments in the rGO around Eu 3+ .…”

Section: Other Ionic Speciesmentioning

confidence: 99%

Fluorescence from graphene oxide and the influence of ionic, π–π interactions and heterointerfaces: electron or energy transfer dynamics

Vempati

Uyar

2014

Phys. Chem. Chem. Phys.

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2D crystals such as graphene and its oxide counterpart have sought good research attention for their application as well as fundamental interest. Especially graphene oxide (GO) is quite interesting because of its versatility and diverse application potential. However the mechanism of fluorescence from GO is under severe discussion. To explain the emission in general two interpretations were suggested, viz localization of sp(2) clusters and involvement of oxygeneous functional groups. Despite this disagreement, it should be acknowledged that the heterogeneous atomic structure, synthesis dependent and uncontrollable implantation of oxygen functional groups on the basal plane make such explanations more difficult. Nevertheless, a suitable explanation enhances the applicability of the material which also enables the design of novel materials. At this juncture we believe that given the complexity in understanding the emission mechanism it would be very useful to review the literature. In this perspective we juxtapose various results related to fluorescence and influencing factors so that a conclusive interpretation may be unveiled. Apparently, the existing interpretations have largely ignored the factors such as self-rolling, byproduct formation etc. Vis-a-vis previous reviews did not discuss the interfacial charge transfer across heterostructures and the implication on the optical properties of GO or reduced graphene oxide (rGO). Such analysis would be very insightful to determine the energetic location of sub band gap states. Moreover, ionic and π-π type interactions are also considered for their influence on emission properties. Apart from these, quantum dots, covalent modifications and nonlinear optical properties of GO and rGO were discussed for completeness. Finally we made concluding remarks with outlook.

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Section: Other Ionic Speciesmentioning

confidence: 99%

Fluorescence from graphene oxide and the influence of ionic, π–π interactions and heterointerfaces: electron or energy transfer dynamics

Vempati

Uyar

2014

Phys. Chem. Chem. Phys.

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“…The PLE spectrum contains a major peak at ∼314 nm (3.94 eV) when recorded at 618 nm emission. This strong band is attributed to the charge transfer absorption from the oxygen ligands of graphene to the Eu atom. , In addition to the 314 nm excitation, five more peaks also appear at wavelengths of 365, 372, 378, 384, and 395 nm, as shown in inset of Figure b, which are assigned to the direct excitation of the f–f transitions of the Eu 3+ ions. The photoluminescence emission (PL) spectrum recorded at 314 nm excitation shows a sharp intense red emission peaking at ∼618 nm at room temperature (Figure c).…”

mentioning

confidence: 95%

Optical Bifunctionality of Europium-Complexed Luminescent Graphene Nanosheets

et al. 2011

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Graphene is an intriguing two-dimensional material, which could be modified for achieving tunable properties with many applications. Photoluminescence of graphene due to plasmonic emission is well-known, however, attempts to develop strong luminescent graphene have been difficult. Synthesis of a graphene-based material with a dual optical functionality, namely quenching the fluorescence of organic dyes while maintaining its own self-luminescence, is an interesting and challenging proposition. Here, we demonstrate this optical bifunctionality in a lattice-modified luminescent graphene, where europium(III) cations are complexed with graphene through oxygen functionalities. After excitation at 314 nm, a hypersensitive red emission is observed at 614 and 618 nm showing the complexation of europium(III) with graphene. We demonstrate dual functionality of this graphene by the quenching of luminescence of Rhodamine-B while displaying its own hypersensitive red emission. The decay lifetime observed through the time-resolved spectroscopy confirms its potential for applications in biosensing as well as optoelectronics.

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Eu(III) complexation of phenyltrisalanine and phenylbisalanine in aqueous solution studied by photoluminescence and UV spectroscopy

Cited by 2 publications

References 34 publications

Fluorescence from graphene oxide and the influence of ionic, π–π interactions and heterointerfaces: electron or energy transfer dynamics

Fluorescence from graphene oxide and the influence of ionic, π–π interactions and heterointerfaces: electron or energy transfer dynamics

Optical Bifunctionality of Europium-Complexed Luminescent Graphene Nanosheets

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