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Title: Influence of Morphology on Blinking Mechanisms and Excitonic Fine Structure of Single Colloidal Nanoplatelets

Abstract

Colloidal semiconductor nanoplatelets with electronic structure as quantum wells have recently emerged as exciting materials for optoelectronic applications. Here we investigate how morpholo-gy affects important photoluminescence properties of single CdSe and core/shell CdSe/CdZnS na-noplatelets. By analyzing photoluminescence intensity-lifetime correlation and second-order pho-ton correlation results, we demonstrate that, irrespective of morphology, Auger recombination plays only a minor role in dictating the blinking behavior of the nanoplatelets. We find that a rough shell induces additional nonradiative channels presumably related to defects or traps of an imper-fect shell. However, polarization-resolved spectroscopy analysis reveals exciton fine-structure splitting on the order of several tens of meV in rough-shell nanoplatelets at room temperature, which is attributed to exciton localization and substantiated with theoretical calculations taking into account the nanoplatelet shape and electron-hole exchange interaction.

Authors:
ORCiD logo [1];  [1];  [2]; ORCiD logo [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Jackson State Univ., Jackson, MS (United States); Ioffe Institute, St. Petersburg (Russia)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1482958
Alternate Identifier(s):
OSTI ID: 1483902
Report Number(s):
LA-UR-18-28802
Journal ID: ISSN 2040-3364; NANOHL
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nanoscale
Additional Journal Information:
Journal Name: Nanoscale; Journal ID: ISSN 2040-3364
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; Material Science

Citation Formats

Hu, Zhongjian, Singh, Ajay, Goupalov, Serguei, Hollingsworth, Jennifer, and Htoon, Han. Influence of Morphology on Blinking Mechanisms and Excitonic Fine Structure of Single Colloidal Nanoplatelets. United States: N. p., 2018. Web. doi:10.1039/C8NR06234J.
Hu, Zhongjian, Singh, Ajay, Goupalov, Serguei, Hollingsworth, Jennifer, & Htoon, Han. Influence of Morphology on Blinking Mechanisms and Excitonic Fine Structure of Single Colloidal Nanoplatelets. United States. doi:10.1039/C8NR06234J.
Hu, Zhongjian, Singh, Ajay, Goupalov, Serguei, Hollingsworth, Jennifer, and Htoon, Han. Thu . "Influence of Morphology on Blinking Mechanisms and Excitonic Fine Structure of Single Colloidal Nanoplatelets". United States. doi:10.1039/C8NR06234J.
@article{osti_1482958,
title = {Influence of Morphology on Blinking Mechanisms and Excitonic Fine Structure of Single Colloidal Nanoplatelets},
author = {Hu, Zhongjian and Singh, Ajay and Goupalov, Serguei and Hollingsworth, Jennifer and Htoon, Han},
abstractNote = {Colloidal semiconductor nanoplatelets with electronic structure as quantum wells have recently emerged as exciting materials for optoelectronic applications. Here we investigate how morpholo-gy affects important photoluminescence properties of single CdSe and core/shell CdSe/CdZnS na-noplatelets. By analyzing photoluminescence intensity-lifetime correlation and second-order pho-ton correlation results, we demonstrate that, irrespective of morphology, Auger recombination plays only a minor role in dictating the blinking behavior of the nanoplatelets. We find that a rough shell induces additional nonradiative channels presumably related to defects or traps of an imper-fect shell. However, polarization-resolved spectroscopy analysis reveals exciton fine-structure splitting on the order of several tens of meV in rough-shell nanoplatelets at room temperature, which is attributed to exciton localization and substantiated with theoretical calculations taking into account the nanoplatelet shape and electron-hole exchange interaction.},
doi = {10.1039/C8NR06234J},
journal = {Nanoscale},
issn = {2040-3364},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
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