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

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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.

Original languageEnglish
Article number187401
JournalPhysical review letters
Volume106
Issue number18
DOIs
Publication statusPublished - May 3 2011

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Park, Y. S., Malko, A. V., Vela, J., Chen, Y., Ghosh, Y., García-Santamaría, F., Hollingsworth, J. A., Klimov, V. I., & Htoon, H. (2011). Near-unity quantum yields of biexciton emission from CdSe/CdS nanocrystals measured using single-particle spectroscopy. Physical review letters, 106(18), [187401]. https://doi.org/10.1103/PhysRevLett.106.187401