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, V. 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
AN - SCOPUS:79960647961
VL - 106
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 18
M1 - 187401
ER -