Color-Tunable and White-Light Luminescence in Lanthanide-Dicyanoaurate Coordination Polymers.

The new lanthanide-dicyanoaurate coordination polymers [BuN][Ln(NO)Au(CN)] (Ln = Sm, Dy) and Sm[Au(CN)]·3HO were prepared and structurally characterized and their luminescence spectra described. The emissions of solid-solutions of [BuN][Ln(NO)Au(CN)] (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 [BuN][CeDy(NO)Au(CN)] and [BuN][SmTb(NO)Au(CN)], and the ternary solid-solutions [BuN][CeSmTb(NO)Au(CN)] and [BuN][CeEuTb(NO)Au(CN)], were prepared and examined in terms of suitability for color-tuning capacity. These results showcase that the emission from the [BuN][Ln(NO)Au(CN)] 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)]·3HO 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.