Color-Tunable and White-Light Luminescence in Lanthanide–Dicyanoaurate Coordination Polymers
journal contribution
posted on 2017-06-23, 12:33 authored by Ryan J. Roberts, Debbie Le, Daniel B. LeznoffThe 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.
