title: Strategy for synthesizing quantum dot-layered double hydroxide nanocomposites and their enhanced photoluminescence and photostability.
abstract: Layered double hydroxide-quantum dot (LDH-QD) composites are synthesized via a room temperature LDH formation reaction in the presence of QDs. InP/ZnS (core/shell) QD, a heavy metal free QD, is used as a model constituent. Interactions between QDs (with negative zeta potentials), decorated with dihydrolipoic acids, and inherently positively charged metal hydroxide layers of LDH during the LDH formations are induced to form the LDH-QD composites. The formation of the LDH-QD composites affords significantly enhanced photoluminescence quantum yields and thermal- and photostabilities compared to their QD counterparts. In addition, the fluorescence from the solid LDH-QD composite preserved the initial optical properties of the QD colloid solution without noticeable deteriorations such as red-shift or deep trap emission. Based on their advantageous optical properties, we also demonstrate the pseudo white light emitting diode, down-converted by the LDH-QD composites.
authors.affiliation: Department of Chemistry, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-Dong, Nam-Gu, Pohang, Gyungbuk, South Korea 790-784.
authors.forename: Seungho
authors.initials: S
authors.lastname: Cho
authors.forename: Sungwook
authors.initials: S
authors.lastname: Jung
authors.forename: Sanghwa
authors.initials: S
authors.lastname: Jeong
authors.forename: Jiwon
authors.initials: J
authors.lastname: Bang
authors.forename: Joonhyuck
authors.initials: J
authors.lastname: Park
authors.forename: Youngrong
authors.initials: Y
authors.lastname: Park
authors.forename: Sungjee
authors.initials: S
authors.lastname: Kim
mesh_terms: D003102:Colloids / Q000737:chemistry; D020650:Combinatorial Chemistry Techniques / Q000379:methods*; D004355:Drug Stability; D006878:Hydroxides / Q000737:chemistry*; D008027:Light; D049449:Luminescence; D046529:Microscopy, Electron, Transmission; D053761:Nanocomposites / Q000737:chemistry*; D045663:Quantum Dots
chemical_list: D003102:Colloids; D006878:Hydroxides; C031356:hydroxide ion