Highly Fluorescent and Stable Quantum Dot-Polymer-Layered Double Hydroxide Composites

作者：Cho Seungho; Kwag Jungheon; Jeong Sanghwa; Baek Yeonggyeong; Kim Sungjee^*

来源：Chemistry of Materials, 2013, 25(7): 1071-1077.

DOI：10.1021/cm3040505

• quantum dot
• photoluminescence quantum yield
• amphiphilic polymer encapsulation
• layered double hydroxide
• photostability

We report a designed strategy for a synthesis of highly luminescent and photostable composites by incorporating quantum dots (QDs) into layered double hydroxide (LDH) matrices without deterioration of a photoluminescence (PL) efficiency of the fluorophores during the entire processes of composite formations. The QDs synthesized in an organic solvent are encapsulated by polymers, poly(maleic acid-alt-octadecene) to transfer them into water without altering the initial surface ligands. The polymer-encapsulated QDs with negative zeta potentials (-29.5 +/- 2.2 mV) were electrostatically assembled with positively charged (24.9 +/- 0.6 mV) LDH nanosheets to form QD-polymer-LDH composites (PL quantum yield: 74.1%). QD-polymer-LDH composite films are fabricated by a drop-casting of the solution on substrates. The PL properties of the films preserve those of the organic QD solutions. We also demonstrate that the formation of the QD-polymer-LDH composites affords enhanced photostabilities through multiple protections of QD surface by polymers and LDH nanosheets from the environment.

• 出版日期2013-4-9