“…In order to obtain stable lanthanide complexes with better optical properties, most investigations have focused on organic ligands such as diketones, quinolines, phenanthrolines, cryptands, etc. [7][8][9][10][11] Meanwhile, aromatic carboxylic acids, fluorine-containing compounds and heterocyclic ligands are also proving attractive owing to their high thermal and luminescent stabilities. [12][13][14] However, the maximum absorption bands of organic ligands are usually in the ultraviolet or visible region and cannot utilize cheap commercial semiconductor LD as the excitation source.…”