Eu(iii)-coupled graphene oxide as a luminescent material

Abstract

A graphene–inorganic hybrid material has been fabricated by coupling Eu(III) complexes onto graphene oxide (GO) (denoted as Eu-GO hereafter). Successful coupling has been verified by ¹H NMR, CHN elemental analysis, inductively coupled plasma-atomic emission spectroscopy (ICP) for Eu³⁺ content, and Fourier transform infrared (FTIR) spectroscopy. UV-vis measurements of a dilute dispersion of Eu-GO in ethanol reveal the characteristic absorption of Eu(III) complexes, which gives further proof of the successful coupling. The composites display strong luminescence, more durable emission decay, enhanced photoluminescent stability, and improved thermal stability in comparison with the isolated complexes, due to interactions of the complexes with the GO.