Processes of luminescence quenching in europium aromatic carboxylates with the participation of LMCT states: A brief review

•Role of LMCT states in the luminescence excitation of europium coordination compounds.•Luminescence quenching of europium polar substituted benzoates via LMCT states.•LMCT states in europium phenyl- and naphthylcarboxylates with methylene bridge.•Luminescence quenching of europium pyrrole-containing carboxylates via LMCT states.•Two main quenching channels “5D0 → LMCT” and “ligand → LMCT”.