Abstract

Thiol-capped CdTe nanocrystals with cubic zinc blende structure are synthesized in aqueous solution. Their steady-state and time-resolved luminescence characteristics are studied at room and liquid nitrogen temperatures. A strong exciton luminescence peak at 2.3 eV dominates the emission spectrum of CdTe nanocrystals at room temperature, whereas the trap band centered at 2.0 eV undergoes substantial temperature quenching. Luminescence excitation spectra reveal different channels leading to radiative recombination via either excitons or traps. The mean luminescence decay time of CdTe nanocrystals at room temperature decreases from 120 ns at 1.94 eV to 20 ns at 2.43 eV. Luminescence decay kinetics of CdTe nanocrystals are strongly nonexponential and are described by extremely broad lifetime distributions lying within the range from a few hundred picoseconds to a few hundred nanoseconds.

Keywords

LuminescenceExcitonNanocrystalPicosecondMaterials scienceQuenching (fluorescence)Cadmium telluride photovoltaicsPhotoluminescenceNanosecondAnalytical Chemistry (journal)OptoelectronicsChemistryNanotechnologyFluorescenceOpticsCondensed matter physicsPhysics

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Year
1999
Type
article
Volume
103
Issue
46
Pages
10109-10113
Citations
200
Access
Closed

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А. М. Капитонов, А. П. Ступак, С. В. Гапоненко et al. (1999). Luminescence Properties of Thiol-Stabilized CdTe Nanocrystals. The Journal of Physical Chemistry B , 103 (46) , 10109-10113. https://doi.org/10.1021/jp9921809

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DOI
10.1021/jp9921809