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Research Article

Intercluster aurophilicity-driven aggregation lighting circularly polarized luminescence of chiral gold clusters

Zhen Han§, Xueli Zhao§, Peng Peng, Si Li, Chong Zhang, Man Cao, Kai Li, Zhao-Yang Wang( ), Shuang-Quan Zang( )
Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou 450001, China

§Zhen Han and Xueli Zhao contributed equally to this work.

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Abstract

Herein, we prepared two novel pairs of enantiomeric gold cluster complexes, Au4PL4/Au4PD4 and (Au4L4)n/(Au4D4)n with atomic precision. In Au4PL4/Au4PD4, the discrete chiral Au4-based aggregation-induced emission (AIE) luminogens are separated by bulky substitutes. The corresponding aggregates are cyan-emitting with a photoluminescence quantum yield (PLQY) of 14.4%. Upon decreasing the size of the substituents, these chiral Au4 clusters are strung together by inter-cluster Au-Au interactions, which cause a low-energy green emission from the aggregated (Au4L4)n/(Au4D4)n with a much higher PLQY of 41.4% and more intense circularly polarised photoluminescence (CPL) with a dissymmetry factor |gPL| of 7.0 × 10-3. Using (Au4L4)n/(Au4D4)n, circularly polarised organic light-emitting diodes (CP-OLEDs) were for the first time fabricated with |gEL| = |gPL|. These findings signify that inter-cluster metallophilic interactions are a new and important type of driving force for AIE and crystallization-induced emission (CIE), suggesting great potential of CPL-active metal clusters in CP-OLEDs.

Keywords

aggregation-induced emissionatomic precisiongold clusterintercluster aurophilicitycircularly polarized luminescence

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Nano Research
Volume 13 Issue 12,
December 2020
Pages 3248-3252
DOI: 10.1007/s12274-020-2997-0
Cite this article:
Han Z, Zhao X, Peng P, et al. Intercluster aurophilicity-driven aggregation lighting circularly polarized luminescence of chiral gold clusters. Nano Research, 2020, 13(12): 3248-3252. https://doi.org/10.1007/s12274-020-2997-0
Topics:
Binary alloysGold alloysGold compoundsMetalsOrganic light emitting diodes (OLED) Photoluminescence

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Received: 27 June 2020
Revised: 18 July 2020
Accepted: 20 July 2020
Published: 25 August 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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