Quantum dot–layered double hydroxide composites for near-infrared emitting codes
SCIE
SCOPUS
- Title
- Quantum dot–layered double hydroxide composites for near-infrared emitting codes
- Authors
- Seungho Cho; SeongCheol Hong; Kim, S
- Date Issued
- 2014-01
- Publisher
- ROYAL SOC CHEMISTRY
- Abstract
- 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.
- Keywords
- SEMICONDUCTOR CLUSTERS; PARTICLE-SIZE; NANOCRYSTALS; AL; PHOTOLUMINESCENCE; DELAMINATION; EMISSION; FILMS; FLUORESCENT; COMPLEXES
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/13101
- DOI
- 10.1039/C3TC31699H
- ISSN
- 2050-7526
- Article Type
- Article
- Citation
- JOURNAL OF MATERIALS CHEMISTRY C, vol. 2, no. 3, page. 450 - 457, 2014-01
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