skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Using shape to control photoluminescence from CdSe/CdS core/shell nanorods.

Abstract

CdSe/CdS core/shell nanorods can exhibit high photoluminescence quantum yields, but it is not yet clear what processes determine the yields and how they can be controlled. Moreover, the effective band alignment between the core and the shell affects quantum yield, but its nature is still under debate. We systematically studied quantum yields when the shell is excited as a function of both core size and shell volume. Using time-resolved photoluminescence decay measurements and transient-absorption spectroscopy, we found that quantum yields are determined by a balance between radiative and nonradiative recombination rates, and not by single-carrier trapping. The radiative recombination rate decreases as the nanorod volume increases, independent of the core size. The results indicate that high quantum yields can be obtained only by limiting the size of the shell and point to an effective quasi-type-II band alignment for all of the nanorods in this study.

Authors:
; ; ;  [1]
  1. Center for Nanoscale Materials
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1020694
Report Number(s):
ANL/CNM/JA-69816
Journal ID: 1948-7185; TRN: US201116%%592
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Nano Lett.
Additional Journal Information:
Journal Volume: 2; Journal Issue: 12 ; Jun. 16, 2011
Country of Publication:
United States
Language:
ENGLISH
Subject:
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; ALIGNMENT; DECAY; PHOTOLUMINESCENCE; RECOMBINATION; SHAPE; SPECTROSCOPY; TRAPPING

Citation Formats

She, C, Demortiere, A, Shevchenko, E V, and Pelton, M. Using shape to control photoluminescence from CdSe/CdS core/shell nanorods.. United States: N. p., 2011. Web. doi:10.1021/jz200510f.
She, C, Demortiere, A, Shevchenko, E V, & Pelton, M. Using shape to control photoluminescence from CdSe/CdS core/shell nanorods.. United States. https://doi.org/10.1021/jz200510f
She, C, Demortiere, A, Shevchenko, E V, and Pelton, M. Thu . "Using shape to control photoluminescence from CdSe/CdS core/shell nanorods.". United States. https://doi.org/10.1021/jz200510f.
@article{osti_1020694,
title = {Using shape to control photoluminescence from CdSe/CdS core/shell nanorods.},
author = {She, C and Demortiere, A and Shevchenko, E V and Pelton, M},
abstractNote = {CdSe/CdS core/shell nanorods can exhibit high photoluminescence quantum yields, but it is not yet clear what processes determine the yields and how they can be controlled. Moreover, the effective band alignment between the core and the shell affects quantum yield, but its nature is still under debate. We systematically studied quantum yields when the shell is excited as a function of both core size and shell volume. Using time-resolved photoluminescence decay measurements and transient-absorption spectroscopy, we found that quantum yields are determined by a balance between radiative and nonradiative recombination rates, and not by single-carrier trapping. The radiative recombination rate decreases as the nanorod volume increases, independent of the core size. The results indicate that high quantum yields can be obtained only by limiting the size of the shell and point to an effective quasi-type-II band alignment for all of the nanorods in this study.},
doi = {10.1021/jz200510f},
url = {https://www.osti.gov/biblio/1020694}, journal = {Nano Lett.},
number = 12 ; Jun. 16, 2011,
volume = 2,
place = {United States},
year = {2011},
month = {6}
}