Abstract

Hybrid nanocomposites of cadmium sulfide (CdS) quantum dots and poly(propyleneimine) dendrimer having a 1,4-diaminobutane core have been produced by colloidal synthesis in degassed methanol at room temperature using third-, fourth-, and fifth-generation (G5.0) dendrimers, and their spectroscopic properties have been investigated. The nanoparticles fluoresced from 375 to 650nm under near-ultraviolet excitation, and their absorption spectra exhibited a strong blueshift of the band edge compared to that of the bulk CdS. The stability of nanocomposites depended significantly, while the size and spectroscopic properties exhibited a weaker dependence, on the dendrimer generation. Most compact and stable nanoparticles were obtained with G5.0 dendrimers. Average diameter was estimated to be 2.2±0.3nm, assuming nanoparticles of spherical shape within an infinite well potential. The room-temperature luminescence has a fast component with 165±5ps lifetime and a slow component with a 40±2ns lifetime. The luminescence is partially polarized with an initial anisotropy of 0.39±0.02.

© 2007 Optical Society of America

Full Article  |  PDF Article
Related Articles
Dendrimer molecules with record large two-photon absorption cross section

Mikhail Drobizhev, Aliaksandr Karotki, Aleksander Rebane, and Charles W. Spangler
Opt. Lett. 26(14) 1081-1083 (2001)

Upconversion luminescence of CdTe nanocrystals by use of near-infrared femtosecond laser excitation

W. Z. Wu, Z. R. Zheng, W. L. Liu, J. P. Zhang, Y. X. Yan, Q. H. Jin, Y. Q. Yang, and W. H. Su
Opt. Lett. 32(9) 1174-1176 (2007)

High-order nonlinear optical response of a polymer nanocomposite film incorporating semiconducotor CdSe quantum dots

Xiangming Liu, Yusuke Adachi, Yasuo Tomita, Juro Oshima, Takuya Nakashima, and Tsuyoshi Kawai
Opt. Express 20(12) 13457-13469 (2012)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (8)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (3)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription