Near-unity quantum yields of biexciton emission from CdSe/CdS nanocrystals measured using single-particle spectroscopy

Y. S. Park; A. V. Malko; J. Vela; Y. Ghosh; F. García-Santamaría; Jennifer Ann Hollingsworth; Victor Ivanovich Klimov; Han Htoon; Y. Chen

doi:10.1103/PhysRevLett.106.187401

Near-unity quantum yields of biexciton emission from CdSe/CdS nanocrystals measured using single-particle spectroscopy

Y. S. Park
, A. V. Malko
, J. Vela
, Y. Ghosh
, F. García-Santamaría
, Jennifer Ann Hollingsworth
, Victor Ivanovich Klimov
, Han Htoon
, Y. Chen

Los Alamos National Laboratory

Research output: Contribution to journal › Article › peer-review

213 Scopus citations

Abstract

Biexciton photoluminescence (PL) quantum yields (Q_2X) of individual CdSe/CdS core-shell nanocrystal quantum dots with various shell thicknesses are derived from independent PL saturation and two-photon correlation measurements. We observe a near-unity Q_2X for some nanocrystals with an ultrathick 19-monolayer shell. High Q_2X's are, however, not universal and vary widely among nominally identical nanocrystals indicating a significant dependence of Q_2X upon subtle structural differences. Interestingly, our measurements indicate that high Q_2X's are not required to achieve complete suppression of PL intensity fluctuations in individual nanocrystals.

Original language	English
Article number	187401
Journal	Physical Review Letters
Volume	106
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevLett.106.187401
State	Published - May 3 2011

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title = "Near-unity quantum yields of biexciton emission from CdSe/CdS nanocrystals measured using single-particle spectroscopy",

abstract = "Biexciton photoluminescence (PL) quantum yields (Q2X) of individual CdSe/CdS core-shell nanocrystal quantum dots with various shell thicknesses are derived from independent PL saturation and two-photon correlation measurements. We observe a near-unity Q2X for some nanocrystals with an ultrathick 19-monolayer shell. High Q2X's are, however, not universal and vary widely among nominally identical nanocrystals indicating a significant dependence of Q2X upon subtle structural differences. Interestingly, our measurements indicate that high Q2X's are not required to achieve complete suppression of PL intensity fluctuations in individual nanocrystals.",

author = "Park, \{Y. S.\} and Malko, \{A. V.\} and J. Vela and Y. Ghosh and F. Garc{\'i}a-Santamar{\'i}a and Hollingsworth, \{Jennifer Ann\} and Klimov, \{Victor Ivanovich\} and Han Htoon and Y. Chen",

year = "2011",

month = may,

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doi = "10.1103/PhysRevLett.106.187401",

language = "English",

volume = "106",

journal = "Physical Review Letters",

issn = "0031-9007",

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T1 - Near-unity quantum yields of biexciton emission from CdSe/CdS nanocrystals measured using single-particle spectroscopy

AU - Park, Y. S.

AU - Malko, A. V.

AU - Vela, J.

AU - Ghosh, Y.

AU - García-Santamaría, F.

AU - Hollingsworth, Jennifer Ann

AU - Klimov, Victor Ivanovich

AU - Htoon, Han

AU - Chen, Y.

PY - 2011/5/3

Y1 - 2011/5/3

N2 - Biexciton photoluminescence (PL) quantum yields (Q2X) of individual CdSe/CdS core-shell nanocrystal quantum dots with various shell thicknesses are derived from independent PL saturation and two-photon correlation measurements. We observe a near-unity Q2X for some nanocrystals with an ultrathick 19-monolayer shell. High Q2X's are, however, not universal and vary widely among nominally identical nanocrystals indicating a significant dependence of Q2X upon subtle structural differences. Interestingly, our measurements indicate that high Q2X's are not required to achieve complete suppression of PL intensity fluctuations in individual nanocrystals.

AB - Biexciton photoluminescence (PL) quantum yields (Q2X) of individual CdSe/CdS core-shell nanocrystal quantum dots with various shell thicknesses are derived from independent PL saturation and two-photon correlation measurements. We observe a near-unity Q2X for some nanocrystals with an ultrathick 19-monolayer shell. High Q2X's are, however, not universal and vary widely among nominally identical nanocrystals indicating a significant dependence of Q2X upon subtle structural differences. Interestingly, our measurements indicate that high Q2X's are not required to achieve complete suppression of PL intensity fluctuations in individual nanocrystals.

UR - https://www.scopus.com/pages/publications/79960647961

U2 - 10.1103/PhysRevLett.106.187401

DO - 10.1103/PhysRevLett.106.187401

M3 - Article

SN - 0031-9007

VL - 106

JO - Physical Review Letters

JF - Physical Review Letters

IS - 18

M1 - 187401

ER -

Near-unity quantum yields of biexciton emission from CdSe/CdS nanocrystals measured using single-particle spectroscopy

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