From a blue to white to yellow emitter: a hexanuclear copper iodide nanocluster.

Author(s) Xu, K.; Chen, B.L.; Zhang, R.; Liu, L.; Zhong, X.X.; Wang, L.; Li, F.Y.; Li, G.H.; Alamry, K.A.; Li, F.B.; Wong, W.Y.; Qin, H.M.
Journal Dalton Trans
Date Published 2020 May 14
Abstract

Highly emissive copper(i) halide nanoclusters showing thermally activated delayed fluorescence (TADF) have been paid much attention, but rarely reported so far. Herein, a hexanuclear copper(i) iodide cluster containing a tridentate N∧P∧N ligand, [CuI(ppda)] {ppda = 2-[2-(dimethylamino)phenyl(phenyl)phosphino]-N,N-dimethylaniline}, was synthesized. All six copper atoms are four-coordinate, including four CuPNI and two CuI units. This complex exhibits intense white emission in the powder state at room temperature and shows a peak at a wavelength of 535 nm (Φ = 0.36) with a microsecond lifetime (τ = 4.4 μs). Emission colors can be largely tuned from blue to white to yellow, from the crystal to powder to film state at 297 K. The emission of [CuI(ppda)] originates from a combination of MLCT and XLCT transitions. This complex showed good thermal stability. A solution-processed, nondoped device of complex [CuI(ppda)] exhibits stable yellow emission with the CIE coordinates (x, y) of (0.43, 0.51). [CuI(ppda)] also shows reasonable photocatalytic H evolution activity under visible-light irradiation.

DOI 10.1039/c9dt04701h
ISSN 1477-9234
Citation Xu K, Chen B-, Zhang R, Liu L, Zhong X-, Wang L, et al. From a blue to white to yellow emitter: a hexanuclear copper iodide nanocluster. Dalton Trans. 2020;49(18):5859-5868.

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