Artificial light plays an essential role in information technologies such as optical telecommunications, data storage, security features, and the display of information. Here, researchers show a chiral lanthanide lumino-glass with extra-large circularly polarized light (luminescence) (CPL) for advanced photonic security device applications.
The chiral lanthanide glass is composed of a europium complex with the chiral (+)-3-(trifluoroacetyl) camphor ligand and the achiral glass promoter tris (2,6-dimethoxyphenyl) phosphine oxide ligand. The glass phase transition behavior of the Eu (III) complex is characterized using differential scanning calorimetry.
The transparent amorphous glass shows circularly polarized light CPL with extra-large dissymmetry factor of gCPL = 1.2. The brightness of the lumino-glass is one thousand times larger than that of Eu (III) luminophores embedded in polymer films of the same thickness at a Eu (III) concentration of 1 mM. The application of the chiral lanthanide lumino-glass in an advanced security paint is demonstrated.