Quantum dot-layered double hydroxide composites for near-infrared emitting codes

被引:18
作者
Cho, Seungho [1 ]
Hong, Seong Cheol [1 ]
Kim, Sungjee [1 ]
机构
[1] Pohang Univ Sci & Technol POSTECH, Dept Chem, Pohang 790784, Gyungbuk, South Korea
关键词
SEMICONDUCTOR CLUSTERS; NANOCRYSTALS; DELAMINATION; FILMS; PHOTOLUMINESCENCE; FLUORESCENT; EMISSION; BRIGHT; ROBUST; LDH;
D O I
10.1039/c3tc31699h
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Near-infrared (NIR)-emitting PbS-based quantum dots (QDs) and exfoliated layered double hydroxide (LDH) nanosheets were self-assembled to form photostable composites for NIR-emitting codes. PbS QDs prepared by a pyrolysis synthetic method or PbS-CdS (core-shell) QDs prepared by a cation exchange using PbS QDs were transferred to aqueous solutions by surface ligand exchange to dihydrolipoic acid (DHLA). The DHLA-decorated QDs and exfoliated LDH nanosheets were assembled by electrostatic interactions during vortexing. The QD-LDH composite films prepared by drop-casting exhibit more than 500% higher NIR PL intensities than the counterpart QD films (without LDH matrices) under identical conditions (i.e., QD concentration). Photostability tests under continuous light irradiation reveal that the PbS-CdS QD films are more photostable than the PbS QD films. Formation of the QD-LDH composites gives rise to further enhancement in the photostability of the film. The photostable PbS-CdS QD-LDH composite films were used to create novel NIR-emitting codes. NIR fluorescence images of a pattern of two kinds of PbS-CdS QD-LDH composite films were recorded with an InGaAs CCD camera equipped with optical filters.
引用
收藏
页码:450 / 457
页数:8
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