▎ 摘　　要

Red light harvesting with Eu3+ graphene complexes are well known in the literature. But embedding Eu2+ in a graphene oxide matrix is a difficult proposition and could be of paramount interest because of emission tunability. Herein, we report the observation of highly visible green luminescence for Eu2+ which occurs due to the transition between the 4f(7) (8S(7/2)) ground state and the 4f(6) 5d excited state with nanosecond time decay through reduction of Eu3+ using a simple chemical approach. This newly formed luminescence complex may be used as a major potential candidate for application in optoelectronics and nanobiotechnology.