Enhancement of the band edge emission of CdSe nano-tetrapods by suppression of surface trapping

Literature Information

Publication Date 2019-04-04
DOI 10.1039/C9CP00198K
Impact Factor 3.676
Authors

Sucheta Banerjee, Fariyad Ali, Anindya Datta


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Abstract

Preparation of CdSe nano-tetrapods in a controlled environment, using a glove box for the preparation of the Se precursor, was found to eliminate radiative surface trap emission to a large extent. This manifested in an increase in the band edge photoluminescence quantum yield by a factor of 20 and a concomitant decrease in the surface trap emission by a factor of 8. Interestingly, the time for recovery of ground state bleaching was more or less the same in the two kinds of nano-tetrapods, even though the photoluminescence dynamics are significantly slower in the more emissive ones. In single emissive nano-tetrapods, the kinetic traces for ground state bleaching recovery became gradually faster upon increasing the pump power. This is likely to be due to the effect of multiexciton relaxation and nonradiative Auger recombination.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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