Rare earth complex/graphene oxide fluorescent material as well as preparation method and application thereof

Abstract

The invention discloses a rare earth complex / graphene oxide fluorescent material and a preparation method and application thereof. The preparation method comprises the following steps: reacting a compound 1 with a compound 2 to obtain a long conjugated ligand; mixing the long conjugate ligand with rare earth metal salt and amino-containing phenanthroline, and reacting to obtain a rare earth complex; mixing the rare earth complex with epoxy silane coupling agent modified graphene oxide, and reacting to obtain the rare earth complex / graphene oxide fluorescent material. The graphene oxide and the rare earth complex are connected through chemical bonds, and the phase separation phenomenon of the graphene oxide and the europium complex in a doping method is effectively solved. Meanwhile, the ligand of the rare earth complex contains a flexible long conjugated chain segment, has good conjugacy and coplanarity, and is small in steric hindrance, so that the energy required by the excited state of the rare earth complex is lower, and the molecular number of the excited state is greatly increased, thereby improving the fluorescence property of the graphene oxide.

Description

technical field [0001] The invention relates to the technical field of fluorescent materials, in particular to a rare earth complex / graphene oxide fluorescent material and its preparation method and application. Background technique [0002] Graphene oxide (GOs) has a special two-dimensional structure and is widely used in material modification due to its unique optical, electromagnetic, and mechanical properties. Its surface is rich in oxygen-containing functional groups such as hydroxyl, carboxyl, and epoxy groups. Aqueous solutions of graphene oxide have weak fluorescence, but the fluorescence is too weak, which greatly limits its application in biomarkers and cell imaging. [0003] Rare earth complexes, such as europium complexes, have certain luminescent properties, and their emission peaks mainly come from Eu 3+ Located around 617nm 5 D. 0 — 7 f 2 The characteristic emission does not change with the different ligands, its emission spectrum is almost a line spectru...

AI Technical Summary

Problems solved by technology

Metal complexes / graphene luminescent materials are mainly physical doping methods and chemical reaction methods. Physical doping methods are mainly combined through weaker interactions such as intermolecular forces and hydrogen bonds, so the compatibility is poor. Prone to phase separation, affecting the use of materials, etc.

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