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Sci. Adv. 2019, 5, eaav9857
2019-07-11 14:39  

Sci. Adv. 2019, 5, eaav9857

 

Mingchen Xie, Chunmiao Han, Qianqian Liang, Jing Zhang, Guohua Xie, Hui Xu*, Highly efficient sky blue electroluminescence from ligand-activated copper iodide clusters: Overcoming the limitations of cluster light-emitting diodes. (Sci. Adv. 2019, 5, eaav9857.)

Here, we introduce donor groups in organic ligands to form ligand-activated clusters, enabling the fabrication of the first cluster-based sky blue–emitting device with a record 30- and 8-fold increased luminance and external quantum efficiency up to ~7000 nits and ~8%, respectively. We show that the electron-donating effect of donor groups can enhance ligand-centered transitions and thoroughly eliminate cluster-centered excited states by delocalizing the molecular transition orbitals from the cluster unit to the ligand, leading to 13-fold increased photoluminescence quantum yield. In turn, the excellent rigidity and photostability of the cluster unit improve the color purity and efficiency stability of the devices. These results will motivate the further development of high-performance optoelectronic clusters by ligand engineering. This substantial progress will motivate and accelerate the development of optoelectronic cluster materials.

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