Blue–Green Luminescence of Terbium–Titanium (Tb3+–Ti) Nanoclusters

概要

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By using terbium–titanium (Tb3+–Ti) complex-alkoxide nanoclusters, we found for the first time that rare-earth–metal (RE–M) nanoclusters could exhibit two different luminescences simultaneously; one is attributed to the $\text{4f}\rightarrow\text{4f}$ ($\text{$^{5}$D$_{4}$} \rightarrow \text{$^{7}$F$_{\text{J}}$}$) transition of Tb3+ ions, and the other is attributed probably to $\text{4f$^{7}$5d} \rightarrow \text{4f}$ transition together with energy transfer between the two states, which is induced by the strong covalent bonding between Tb3+ and Ti-containing ligand fields. Also, by mixing with red-emitting nanoclusters, such as Eu–Al, we verified that Tb–Ti nanoclusters can be used as phosphors exhibiting green (G) and blue (B) luminescences simultaneously for obtaining RGB-based white light. It is expected that RE–M nanoclusters could allow us to flexibly design the color rendering of organic-material-based light-emitting devices.
2006-04-25