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

Ke Xu; Bu-Lin Chen; Rui Zhang; Li Liu; Xin-Xin Zhong; Lei Wang; Feng-Yan Li; Guang-Hua Li; Khalid A. Alamry; Fa-Bao Li; Wai-Yeung Wong; Hai-Mei Qin

doi:10.1039/C9DT04701H

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

Ke Xu,‡^a Bu-Lin Chen,‡^a Rui Zhang,‡^b Li Liu,

*^a Xin-Xin Zhong,*^a Lei Wang,

*^b Feng-Yan Li,

*^c Guang-Hua Li,^d Khalid A. Alamry,

^e Fa-Bao Li,

^a Wai-Yeung Wong

*^f and Hai-Mei Qin^g

Author affiliations

* Corresponding authors

^a Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, School of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, P. R. China
E-mail: liulihubei@hubu.edu.cn, xxzhong@hubu.edu.cn

^b Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
E-mail: wanglei@mail.hust.edu.cn

^c Key Laboratory of Polyoxometalates Science of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun, P. R. China
E-mail: lify525@nenu.edu.cn

^d State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China

^e Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia

^f Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, P. R. China
E-mail: wai-yeung.wong@polyu.edu.hk

^g Fujian Provincial Key Lab of Theoretical and Computational Chemistry, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China

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, [Cu₆I₆(ppda)₂] {ppda = 2-[2-(dimethylamino)phenyl(phenyl)phosphino]-N,N-dimethylaniline}, was synthesized. All six copper atoms are four-coordinate, including four CuPNI₂ and two CuI₄ 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_PL = 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 [Cu₆I₆(ppda)₂] originates from a combination of MLCT and XLCT transitions. This complex showed good thermal stability. A solution-processed, nondoped device of complex [Cu₆I₆(ppda)₂] exhibits stable yellow emission with the CIE coordinates (x, y) of (0.43, 0.51). [Cu₆I₆(ppda)₂] also shows reasonable photocatalytic H₂ evolution activity under visible-light irradiation.

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

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