Optical Bifunctionality of Europium-Complexed Luminescent Graphene Nanosheets

Abstract

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.

A simple way to synthesize well-dispersed Gd2O3 nanoparticles onto reduced graphene oxide sheets

“…3, two typical Raman signals were detected in the range of 1000-1800 cm À1 , which were attributed to D and G band. The positions of D band and G band are detected at 1328 and 1592 cm À1 , which are much close to the europium (Eu)-complexed graphene product that reported previously [23]. The presence of D peak is primarily due to the oxygen groups and defects after the chemical and thermal reduction process.…”

An n-type, new emerging luminescent polybenzodioxane polymer for application in solution-processed green emitting OLEDs

“…The efficiency of radiative recombination is directly proportional to the decay time of the particular transition. 27 The decay spectrum was recorded for PIM-1 at 515 nm for green emission at room temperature by a time correlated single photon counting technique with a picosecond diode laser of 375 nm as a source of excitation. The lifetime data obtained from PIM-1 was best tted to a double-exponential function as,…”

Labeling Graphene Oxygen Groups with Europium

“…Eu III ions have a strong affinity for oxygen functional groups, and form stable coordination complexes upon the formation of dative bonds (Figure 1 a). [8][9][10] Here, we intend to exploit this feature to label oxygen groups on different graphene materials (Figure 1 b). Specifically, we prepared three different graphene Graphene-related materials contain chemically bonded oxygen atoms in the form of epoxy, hydroxy, carboxy, and carbonyl groups.…”

“…[8,9] In addition, several works showed the insertion of Eu ions within the graphene network with the aim of inducing photoluminescence properties to graphene and exploiting the interaction with the available oxygen functional groups. [10][11][12] Here, we propose a simple method to precisely label oxygen groups on different graphene materials. With the appropriate optimization, this method offers the possibility to determine the location and distribution of oxygen groups on graphene materials and also to introduce novel electrochemical and catalytic properties to graphene.…”