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Enhancement of Fluorescence in Colloidal CuInS2 Nanocrystals by Introduction of Crystal Defect

Published online by Cambridge University Press:  31 January 2011

Masato Uehara ,
Kosuke Watanabe ,
Yasuyuki Tajiri ,
Hiroyuki Nakamura  and
Hideaki Maeda
Masato Uehara
Affiliation:
m.uehara@aist.go.jp, National Institute of Advanced Industrial Science and Technology (AIST), Nanotechnology Research Institute, Tosu, Saga, Japan
Kosuke Watanabe
Affiliation:
wata-kou@mm.kyushu-u.ac.jp, Kyushu University, Department of Molecular and Material Sciences, Kasuga, Fukuoka, Japan
Yasuyuki Tajiri
Affiliation:
y.tajiri@aist.go.jp, Kyushu University, Department of Molecular and Material Sciences, Kasuga, Fukuoka, Japan
Hiroyuki Nakamura
Affiliation:
nakamura-hiroyuki@aist.go.jp, National Institute of Advanced Industrial Science and Technology (AIST), Nanotechnology Research Institute, Tosu, Saga, Japan
Hideaki Maeda
Affiliation:
maeda-h@aist.go.jp, National Institute of Advanced Industrial Science and Technology (AIST), Nanotechnology Research Institute, Tosu, Saga, Japan
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Abstract

Cu-In-S nanocrystals were developed as a low toxic fluorescent. The stoichiometric CuInS2 nanocrystals were synthesized facilely by heating a solution of metal complexes. The fluorescence would be originated from the crystal defect. We intentionally introduced the crystal defects related to Cu deficiency in nanocrystal with the prospect that the fluorescence intensity would be increased. The nanocrystals have many defects without phase separation as observed in bulk material. Consequently, the fluorescence quantum yield achieved to c.a. 6%. Moreover, the fluorescence quantum yield was increased up to 15% by the ZnS-coating.

Keywords

nanostructurephotoemissiondefects
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1176: Symposium Y – Nanocrystalline Materials as Precursors for Complex Multifuntional Structures through Chemical Transformations and Self Assembly , 2009 , 1176-Y03-12
Copyright
Copyright © Materials Research Society 2009

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