Photoluminescence characteristics of coupled CdSe/ZnS quantum dots on self-assembled silica nanospheres

K. S. Kang; H. L. Ju; W. H. Han; J. H. Lee; J. G. Choi; D. W. Boo

doi:10.1063/1.2081125

Photoluminescence characteristics of coupled CdSe/ZnS quantum dots on self-assembled silica nanospheres

K. S. Kang, H. L. Ju, W. H. Han, J. H. Lee, J. G. Choi, D. W. Boo

Research output: Contribution to journal › Article › peer-review

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Abstract

The photoluminescence (PL) characteristics of the self-assembled silica nanospheres containing coupled CdSeZnS core-shell quantum dots (QDs) on the surface of the sphere were studied. The degree of QD-coupling and the distribution of the coupled QDs were controlled by generating spatially separated QD-binding sites on the surface of the spheres and varying the QD concentration during the attachment process. When the sizes of QD spots on the surface probed by atomic force microscopy gradually increased, the band gap energy shifted to lower energy via strong Förster energy transfer between nearby QDs, and when UV-exposure time increased, the band gap energy shifted to slightly higher energy, accompanied by a large enhancement in the emission intensity. Moreover, the Bragg diffraction of the self-assembled crystal structure of the spheres affected the PL characteristics of QDs by shifting the entire emission spectra toward longer wavelength as the incident angles were increased.

Original language	English
Article number	141909
Pages (from-to)	1-3
Number of pages	3
Journal	Applied Physics Letters
Volume	87
Issue number	14
DOIs	https://doi.org/10.1063/1.2081125
Publication status	Published - 2005 Oct 3

Bibliographical note

Funding Information:
This work was supported by Korea Research Foundation Grant No. KRF-2000-015-DP0201, Korea. K.S.K. and H.L.J. acknowledge the support from Brain Korea 21 (BK21), and D.W.B. acknowledges the support from Yonsei University Research Fund of 1999.

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.2081125

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title = "Photoluminescence characteristics of coupled CdSe/ZnS quantum dots on self-assembled silica nanospheres",

abstract = "The photoluminescence (PL) characteristics of the self-assembled silica nanospheres containing coupled CdSeZnS core-shell quantum dots (QDs) on the surface of the sphere were studied. The degree of QD-coupling and the distribution of the coupled QDs were controlled by generating spatially separated QD-binding sites on the surface of the spheres and varying the QD concentration during the attachment process. When the sizes of QD spots on the surface probed by atomic force microscopy gradually increased, the band gap energy shifted to lower energy via strong F{\"o}rster energy transfer between nearby QDs, and when UV-exposure time increased, the band gap energy shifted to slightly higher energy, accompanied by a large enhancement in the emission intensity. Moreover, the Bragg diffraction of the self-assembled crystal structure of the spheres affected the PL characteristics of QDs by shifting the entire emission spectra toward longer wavelength as the incident angles were increased.",

author = "Kang, {K. S.} and Ju, {H. L.} and Han, {W. H.} and Lee, {J. H.} and Choi, {J. G.} and Boo, {D. W.}",

note = "Funding Information: This work was supported by Korea Research Foundation Grant No. KRF-2000-015-DP0201, Korea. K.S.K. and H.L.J. acknowledge the support from Brain Korea 21 (BK21), and D.W.B. acknowledges the support from Yonsei University Research Fund of 1999.",

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doi = "10.1063/1.2081125",

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AU - Kang, K. S.

AU - Ju, H. L.

AU - Han, W. H.

AU - Lee, J. H.

AU - Choi, J. G.

AU - Boo, D. W.

N1 - Funding Information: This work was supported by Korea Research Foundation Grant No. KRF-2000-015-DP0201, Korea. K.S.K. and H.L.J. acknowledge the support from Brain Korea 21 (BK21), and D.W.B. acknowledges the support from Yonsei University Research Fund of 1999.

PY - 2005/10/3

Y1 - 2005/10/3

N2 - The photoluminescence (PL) characteristics of the self-assembled silica nanospheres containing coupled CdSeZnS core-shell quantum dots (QDs) on the surface of the sphere were studied. The degree of QD-coupling and the distribution of the coupled QDs were controlled by generating spatially separated QD-binding sites on the surface of the spheres and varying the QD concentration during the attachment process. When the sizes of QD spots on the surface probed by atomic force microscopy gradually increased, the band gap energy shifted to lower energy via strong Förster energy transfer between nearby QDs, and when UV-exposure time increased, the band gap energy shifted to slightly higher energy, accompanied by a large enhancement in the emission intensity. Moreover, the Bragg diffraction of the self-assembled crystal structure of the spheres affected the PL characteristics of QDs by shifting the entire emission spectra toward longer wavelength as the incident angles were increased.

AB - The photoluminescence (PL) characteristics of the self-assembled silica nanospheres containing coupled CdSeZnS core-shell quantum dots (QDs) on the surface of the sphere were studied. The degree of QD-coupling and the distribution of the coupled QDs were controlled by generating spatially separated QD-binding sites on the surface of the spheres and varying the QD concentration during the attachment process. When the sizes of QD spots on the surface probed by atomic force microscopy gradually increased, the band gap energy shifted to lower energy via strong Förster energy transfer between nearby QDs, and when UV-exposure time increased, the band gap energy shifted to slightly higher energy, accompanied by a large enhancement in the emission intensity. Moreover, the Bragg diffraction of the self-assembled crystal structure of the spheres affected the PL characteristics of QDs by shifting the entire emission spectra toward longer wavelength as the incident angles were increased.

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Photoluminescence characteristics of coupled CdSe/ZnS quantum dots on self-assembled silica nanospheres

Abstract

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