title: Surface Ligand Dynamics-Guided Preparation of Quantum Dots-Cellulose Composites for Light-Emitting Diodes.
abstract: Surface ligand dynamics of colloidal quantum dots (QDs) has been revealed as an important issue for determining QDs performance in their synthesis and postsynthesis treatment, such as ligand-related photoluminescence, colloidal stability, and so forth. However, this issue is less associated with the preparation of highly luminescent nanocomposites, which usually leads to poor performance and repeatability. In this work, on the basis of the studies about surface ligand dynamics of aqueous QDs, highly luminescent QDs-cellulose composites are prepared and employed to fabricate high color purity light-emitting diodes (LEDs). Detailed investigations indicate that the species of QD capping ligands and in particular the temperature are the key for controlling the ligand dynamics. The preparation of nanocomposites using less dynamic ligand-modified QDs at low temperature overcomes the conventional problems of QD aggregation, low QD content, luminescence quenching and shift, thus producing highly luminescent QDs-cellulose composites. This protocol is available for a variety of aqueous QDs, such as CdS, CdSe, CdTe, and CdSe(x)Te(1-x), which permits the design and fabrication of QD-based LEDs using the nanocomposites as color conversion layer on a blue emitting InGaN chip.
authors.affiliation: †State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China.
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.
authors.forename: Haoyang
authors.initials: H
authors.lastname: Zou
authors.affiliation: †State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China.
authors.forename: Min
authors.initials: M
authors.lastname: Liu
authors.affiliation: †State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P. R. China.
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.
authors.forename: Yu
authors.initials: Y
authors.lastname: Sheng
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.
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.
authors.forename: Bai
authors.initials: B
authors.lastname: Yang
keywords: aqueous quantum dot; cellulose; ligand dynamics; nanocomposites; white light-emitting diode