Publication | Closed Access
Color-Tunable and White-Light Luminescence in Lanthanide–Dicyanoaurate Coordination Polymers
65
Citations
33
References
2017
Year
The new lanthanide-dicyanoaurate coordination polymers [<sup>n</sup>Bu<sub>4</sub>N]<sub>2</sub>[Ln(NO<sub>3</sub>)<sub>4</sub>Au(CN)<sub>2</sub>] (Ln = Sm, Dy) and Sm[Au(CN)<sub>2</sub>]<sub>3</sub>·3H<sub>2</sub>O were prepared and structurally characterized and their luminescence spectra described. The emissions of solid-solutions of [<sup>n</sup>Bu<sub>4</sub>N]<sub>2</sub>[Ln(NO<sub>3</sub>)<sub>4</sub>Au(CN)<sub>2</sub>] (Ln = Ce, Sm, Eu, Tb, and Dy) were explored with an emphasis on their capacity for luminescent color tuning and white-light emission via the selection of composition, excitation wavelength, and temperature. Specifically, the binary solid-solutions [<sup>n</sup>Bu<sub>4</sub>N]<sub>2</sub>[Ce<sub>0.4</sub>Dy<sub>0.6</sub>(NO<sub>3</sub>)<sub>4</sub>Au(CN)<sub>2</sub>] and [<sup>n</sup>Bu<sub>4</sub>N]<sub>2</sub>[Sm<sub>0.75</sub>Tb<sub>0.25</sub>(NO<sub>3</sub>)<sub>4</sub>Au(CN)<sub>2</sub>], and the ternary solid-solutions [<sup>n</sup>Bu<sub>4</sub>N]<sub>2</sub>[Ce<sub>0.2</sub>Sm<sub>0.6</sub>Tb<sub>0.2</sub>(NO<sub>3</sub>)<sub>4</sub>Au(CN)<sub>2</sub>] and [<sup>n</sup>Bu<sub>4</sub>N]<sub>2</sub>[Ce<sub>0.33</sub>Eu<sub>0.17</sub>Tb<sub>0.5</sub>(NO<sub>3</sub>)<sub>4</sub>Au(CN)<sub>2</sub>], were prepared and examined in terms of suitability for color-tuning capacity. These results showcase that the emission from the [<sup>n</sup>Bu<sub>4</sub>N]<sub>2</sub>[Ln(NO<sub>3</sub>)<sub>4</sub>Au(CN)<sub>2</sub>] framework has the capacity to be tuned to extremes corresponding to deep reds (CIE coordinates 0.65, 0.35), greens (0.28, 0.63), and deep blue/violet (0.16, 0.06) as well as white (0.31, 0.33). Conversely, the emission of the Sm[Au(CN)<sub>2</sub>]<sub>3</sub>·3H<sub>2</sub>O framework, when doped with the green phosphor Tb(III), changes only slightly because of the predominantly Au(I)-based emission and Sm(III) → Au(I) energy transfer.
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