Extracting the number of quantum dots in a microenvironment from ensemble fluorescence intensity fluctuations

Physical Review B - Condensed Matter and Materials Physics

Volumn 75, Issue 4, 2007, Pages

  Chung, Inhee ^a   Witkoskie, James B ^a   Zimmer, John P ^a   Cao, Jianshu ^a   Bawendi, Moungi G ^a  

^a Massachusetts Institute of Technology Cambridge   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 33846401138     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.75.045311     Document Type: Article

References (28)

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28. To determine the number of QDs per microsphere, 5.2 mg of dried microspheres were dispersed in 2.2 mL ethanol and 0.3 mL toluene. The optical density of this clear, index-matched solution was measured at 350 nm, permitting the calculation of the number of QDs present as 9.82× 1014 [reference can be found in C. A. Leatherdale, W. K. Woo, F. V. Mikulec, and M. G. Bawendi, J. Phys. Chem. B JPCBFK 1089-5647 106, 7619 (2002)]. A transmission electron microscope (TEM) image of the spheres was analyzed by ImageJ (http://rsb.info.nih.gov/ij) to determine the average sphere radius (223.5 nm) based on 100 spheres. This radius was used to calculate the volume of one sphere. The reported density of these spheres (Polysciences datasheet 635), 1.96 g cm3, was used to determine the mass of one sphere. The number of spheres could then be obtained as 5.67× 1010. This gives 1.73× 104 QDs per sphere.