Department of Chemistry, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-Dong, Nam-Gu, Pohang, Gyungbuk, South Korea 790-784.
Langmuir. 2013 Jan 8;29(1):441-7. doi: 10.1021/la303812y. Epub 2012 Dec 24.
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.
层状双氢氧化物-量子点（LDH-QD）复合材料是通过在室温下进行 LDH 形成反应，在量子点存在的情况下合成的。使用无重金属的 InP/ZnS（核/壳）QD 作为模型成分。在 LDH 形成过程中，带负 zeta 电位的量子点（QD）与二氢硫辛酸修饰的量子点之间以及固有带正电荷的金属氢氧化物层之间的相互作用诱导形成 LDH-QD 复合材料。与量子点相比，LDH-QD 复合材料的形成显著提高了光致发光量子产率以及热稳定性和光稳定性。此外，固态 LDH-QD 复合材料的荧光保留了 QD 胶体溶液的初始光学性质，没有明显的恶化，如红移或深阱发射。基于它们有利的光学性质，我们还展示了由 LDH-QD 复合材料下转换的伪白光发光二极管。
