Tunable white-light emission from mixed lanthanide (Eu3+, Gd3+, Tb3+) coordination polymers derived from 4-(dipyridin-2-yl)aminobenzoate

摘要: Herein, we have developed a series of isostructural mixed Ln3+-4-(dipyridin-2-yl)aminobenzoate coordination polymers [Ln3+ = Eu3+ (1), Tb3+ (2), and Gd3+ (3)], characterized investigated their photophysical properties. The results demonstrated that by gently tuning the excitation wavelength these lanthanide complexes, white light emission can be realized with Commission Internationale de I'Eclairage coordinates (0.32, 0.34). Furthermore, changing concentration profiles ions stoichiometrically in mixed-lanthanide complexes exciting at particular wavelengths, various colours also successfully obtained. antenna ligand, 4-(dipyridin-2-yl)aminobenzoic acid, provides an efficient energy transfer for sensitization exhibits red green emissions, respectively. Most importantly, due to high (32 150 cm−1) ion lowest-lying level, corresponding complex displays ligand-centered visible blue region, hence it acts as emitter. Therefore, conjunction is suitable choice obtain tunable white-light-emission from Ln3+ polymers. morphological analyses transmission electron microscopy (TEM) disclose compounds exist unique crystalline nano-rods average diameter 200 nm. exhibit thermal stability (∼420 °C).