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Copper Thiocyanate/Copper Iodide Based Hole Transport Composites with Balanced Properties for Efficient Polymer Light-Emitting Diodes

Abstract

The realization of hole transport materials (HTMs) with balanced properties is challenging. We address this challenge by merging the inorganic copper thiocyanate (CuSCN) and copper iodide (CuI) into a composite, and balancing their hole-transport and surface-morphorlogy properties through adjusting the CuI:CuSCN proportion. Both the advantages of CuSCN and CuI are brought into play, including the controlled crystalline growth suppressed by thiocyanate ion (SCN-) and the high mobility provided by CuI, thus yielding a cheap, stable, solution- and low-temperature processed HTM with high transparency and mobility, suitable energy level and smooth surface morphology. The favourable balance is achieved at the CuI proportion of 25wt%, which affords superior performances with maximum lumiance and average current efficiency values of 147 000 cd m-2 and 16.8 cd A-1 for Super Yellow based polymer light-emitting diodes, 134% and 27% higher than that of PEDOT:PSS based control device, respectively. Our results fulfill the expectation for HTM with a good trade-off between interface characteristics and optoelectronic properties, providing a way for significant applications of inorganic HTM in organic electronics, such as solar cells and thin-film transistors.

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Publication details

The article was received on 23 Oct 2017, accepted on 01 Feb 2018 and first published on 01 Feb 2018


Article type: Paper
DOI: 10.1039/C7TC04842D
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Copper Thiocyanate/Copper Iodide Based Hole Transport Composites with Balanced Properties for Efficient Polymer Light-Emitting Diodes

    W. Luo, C. Zeng, X. Du, C. Leng, W. Yao, H. Shi, X. Wei, C. Du and S. Lu, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C7TC04842D

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