Abstract
Artificial light plays an essential role in information technologies such as optical telecommunications, data storage, security features, and the display of information. Here, we show a chiral lanthanide lumino-glass with extra-large circularly polarized 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 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.
Highlights
Artificial light plays an essential role in information technologies such as optical telecommunications, data storage, security features, and the display of information[1]
We focus on an optical information technology based on chiral luminescent molecules
The use of well-designed phosphine oxide ligands is a key strategy for the construction of chiral Eu(III) complexes with large gCPL and Φtot values for advanced circularly polarized luminescence (CPL) luminophore applications
Summary
Artificial light plays an essential role in information technologies such as optical telecommunications, data storage, security features, and the display of information. Muller and colleagues[24] observed an exceptionally large CPL in an Eu(III)-Cs(I) system with characteristic chiral β-diketonate ligands containing a camphor framework (tetrakis(3-heptafluorobutylryl-(+)-camphorato) (gCPL = −1.38)[24], the emission quantum yield was extremely low (Φtot < 1.0%)[25]. We found that phosphine oxide ligands improve the quantum emission yield by controlling the energy quenching state for a chiral Eu(III) complex with camphor (Φtot > 10%)[26].
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