Journal of Nanoparticle Research

, Volume 11, Issue 3, pp 665–670 | Cite as

The third-order optical nonlinearity and upconversion luminescence of CdTe quantum dots under femtosecond laser excitation

Research Paper

Abstract

The aqueous CdTe quantum dots (QDs) were synthesized by the electrostatic reaction method. The optical properties of CdTe QDs were investigated by femtosecond Z-scan and time-resolved luminescence technique in nonresonant spectral region. The nonlinear absorption and refraction are ascribed to two-photon absorption, and time-resolved upconversion photoluminescence produces biexponential decay pattern at infrared femtosecond laser excitation. Upconversion luminescence is composed of a band-edge excitonic state and a photoinduced trapping state. The short-lived band-edge excitonic emission is independent of the detection wavelengths, and long-lived species becomes even longer with the increase of detection wavelengths, which indicates the size dependence of surface excitonic emission.

Keywords

CdTe Quantum dots Optical nonlinearity Time-resolved luminescence dynamics Nanomaterials 

Supplementary material

11051_2008_9416_MOESM1_ESM.doc (26 kb)
(DOC 26 kb)

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Qinhan Jin
    • 1
  • Wenzhi Wu
    • 2
  • Zhiren Zheng
    • 3
  • Yuxi Yan
    • 4
  • Weilong Liu
    • 3
  • Aihua Li
    • 3
  • Yanqiang Yang
    • 3
  • Wenhui Su
    • 3
  1. 1.Research Center for Analytical InstrumentationCollege of Information Science and Engineering, Zhejiang UniversityHangzhouChina
  2. 2.School of Electronic Engineering, Heilongjiang UniversityHarbinChina
  3. 3.Center for Condensed Matter Science and Technology, Department of PhysicsHarbin Institute of TechnologyHarbinChina
  4. 4.Jilin Province Research Center for Engineering and Technology of Spectral InstrumentsJilin UniversityChangchunChina

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