title: Electrophoretic deposition of fluorescent Cu and Au sheets for light-emitting diodes.
abstract: Electrophoretic deposition (EPD) is a conventional method for fabricating film materials from nanometer-sized building blocks, and exhibits the advantages of low-cost, high-efficiency, wide-range thickness adjustment, and uniform deposition. Inspired by the interest in the application of two-dimensional (2D) nanomaterials, the EPD technique has been recently extended to building blocks with 2D features. However, the studies are mainly focused on simplex building blocks. The utilization of multiplex building blocks is rarely reported. In this work, we demonstrate a controlled EPD of Cu and Au sheets, which are 2D assemblies of luminescent Cu and Au nanoclusters. Systematic investigations reveal that both the deposition efficiency and the thickness are determined by the lateral size of the sheets. For Cu sheets with a large lateral size, a high ζ-potential and strong face-to-face van der Waals interactions facilitate the deposition with high efficiency. However, for Au sheets, the small lateral size and ζ-potential limit the formation of a thick film. To solve this problem, the deposition dynamics are controlled by increasing the concentration of the Au sheets and adding acetone. This understanding permits the fabrication of a binary EPD film by the stepwise deposition of Cu and Au sheets, thus producing a luminescent film with both Cu green emission and Au red emission. A white light-emitting diode prototype with color coordinates (x, y) = (0.31, 0.36) is fabricated by employing the EPD film as a color conversion layer on a 365 nm GaN clip and further tuning the amount of deposited Cu and Au sheets.
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China. hao_zhang@jlu.edu.cn.
authors.forename: Jiale
authors.initials: J
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China. hao_zhang@jlu.edu.cn.
authors.forename: Zhennan
authors.initials: Z
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China. hao_zhang@jlu.edu.cn.
authors.forename: Tingting
authors.initials: T
authors.lastname: Li
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China. hao_zhang@jlu.edu.cn.
authors.forename: Ding
authors.initials: D
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China. hao_zhang@jlu.edu.cn.
authors.forename: Kai
authors.initials: K
authors.lastname: Zhang
authors.affiliation: Department of Dermatology, First Affiliated Hospital, Harbin Medical University, Harbin 150001, P. R. China. sf555812@163.com.
authors.forename: Yu
authors.initials: Y
authors.lastname: Sheng
authors.affiliation: Department of Hand & Foot Surgery, The First Hospital of Jilin University, Changchun 130021, P. R. China. tsuijianli@126.com.
authors.forename: Jianli
authors.initials: J
authors.lastname: Cui
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China. hao_zhang@jlu.edu.cn.
authors.forename: Hao
authors.initials: H
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China. hao_zhang@jlu.edu.cn.
authors.forename: Bai
authors.initials: B
authors.lastname: Yang