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 language | English |
|---|---|
| Article number | 187401 |
| Journal | Physical Review Letters |
| Volume | 106 |
| Issue number | 18 |
| DOIs | |
| Publication status | Published - May 3 2011 |
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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, Victor I; Htoon, H.
In: Physical Review Letters, Vol. 106, No. 18, 187401, 03.05.2011.Research output: Contribution to journal › Article
}
TY - JOUR
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 - Chen, Y.
AU - Ghosh, Y.
AU - García-Santamaría, F.
AU - Hollingsworth, J. A.
AU - Klimov, Victor I
AU - Htoon, H.
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.
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U2 - 10.1103/PhysRevLett.106.187401
DO - 10.1103/PhysRevLett.106.187401
M3 - Article
VL - 106
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 18
M1 - 187401
ER -