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. Chen; Y. Ghosh; F. García-Santamaría; J. A. Hollingsworth; V. I. Klimov; H. Htoon

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. Chen, Y. Ghosh, F. García-Santamaría, J. A. Hollingsworth, V. I. Klimov, H. Htoon

Los Alamos National Laboratory

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

162 Citations (Scopus)

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
Publication status	Published - May 3 2011

ASJC Scopus subject areas

Physics and Astronomy(all)

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Near-unity quantum yields of biexciton emission from CdSe/CdS nanocrystals measured using single-particle spectroscopy. / Park, Y. S.; Malko, A. V.; Vela, J.; Chen, Y.; Ghosh, Y.; García-Santamaría, F.; Hollingsworth, J. A.; Klimov, V. I.; Htoon, H.

In: Physical review letters, Vol. 106, No. 18, 187401, 03.05.2011.

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

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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.",

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AU - Chen, Y.

AU - Ghosh, Y.

AU - García-Santamaría, F.

AU - Hollingsworth, J. A.

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AU - Htoon, H.

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