Solvothermal synthesis of InP quantum dots and their enhanced luminescent efficiency by post-synthetic treatments
- Authors
- Byun, Ho-June; Lee, Ju Chul; Yang, Heesun
- Issue Date
- 1-Mar-2011
- Publisher
- ACADEMIC PRESS INC ELSEVIER SCIENCE
- Keywords
- InP quantum dots; Greener phosphorus source; Solvothermal; Photo-etching; Photo-radiation; Core/shell
- Citation
- JOURNAL OF COLLOID AND INTERFACE SCIENCE, v.355, no.1, pp.35 - 41
- Journal Title
- JOURNAL OF COLLOID AND INTERFACE SCIENCE
- Volume
- 355
- Number
- 1
- Start Page
- 35
- End Page
- 41
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/19919
- DOI
- 10.1016/j.jcis.2010.12.013
- ISSN
- 0021-9797
- Abstract
- InP quantum dots (QDs) were solvothermally synthesized by using a greener phosphorus source of P(N(CH3)(2))(3) instead of highly toxic P(TMS)(3) widely used, and subsequently subjected to a size-sorting processing. While as-grown QDs showed an undetectably low emission intensity, post-synthetic treatments such as photo-etching, photo-radiation, and photo-assisted ZnS shell coating gave rise to a substantial increase in emission efficiency due to the effective removal and passivation of surface states. The emission efficiency of the photo-etched QDs was further enhanced by a consecutive UV photo-radiation, attributable to the photo-oxidation at QD surface. Furthermore, a relatively thick ZnS shell on the surface of InP QDs that were surface-modified with hydrophilic ligands beforehand was photochemically generated in an aqueous solution at room temperature. The resulting InP/ZnS core/shell QDs, emitting from blue to red wavelengths, were more efficient than the above photo-treated InP QDs, and their luminescent properties (emission bandwidth and quantum yield) were comparable to those of InP QDs synthesized with P(TMS)(3). Structural, size, and compositional analyses on InP/ZnS QDs were also conducted to elucidate their core/shell structure. (C) 2010 Elsevier Inc. All rights reserved.
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Collections - Graduate School > Materials Science and Engineering > 1. Journal Articles
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