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

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journal contribution
posted on 2017-06-23, 12:33 authored by Ryan J. Roberts, Debbie Le, Daniel B. Leznoff
The new lanthanide–dicyanoaurate coordination polymers [nBu4N]2­[Ln­(NO3)4­Au­(CN)2] (Ln = Sm, Dy) and Sm­[Au­(CN)2]3·3H2O were prepared and structurally characterized and their luminescence spectra described. The emissions of solid-solutions of [nBu4N]2­[Ln­(NO3)4­Au­(CN)2] (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 [nBu4N]2­[Ce0.4Dy0.6(NO3)4­Au­(CN)2] and [nBu4N]2­[Sm0.75Tb0.25(NO3)4­Au­(CN)2], and the ternary solid-solutions [nBu4N]2­[Ce0.2Sm0.6­Tb0.2(NO3)4­Au­(CN)2] and [nBu4N]2­[Ce0.33Eu0.17­Tb0.5(NO3)4­Au­(CN)2], were prepared and examined in terms of suitability for color-tuning capacity. These results showcase that the emission from the [nBu4N]2­[Ln­(NO3)4­Au­(CN)2] 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)2]3·3H2O 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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