The empirical correlation between size and two-photon absorption cross section of CdSe and CdTe quantum dots.

The tuning of CdSe quantum dot (QDs) sizes, and consequently their corresponding two-photon absorption (TPA) cross section, has been systematically investigated. As the size (diameter) of the quantum dots increases, the TPA cross section is found to be empirically related via a power-law proportionality of 3.5+/-0.5 and 5.6+/-0.7 to the diameters of CdSe and CdTe QDs, respectively. The results are tentatively rationalized via a theoretical model of two-photon excitation properties in a system incorporating excitons and defects.

[1]  W E Moerner,et al.  Nonlinear optical chromophores as nanoscale emitters for single-molecule spectroscopy. , 2005, Accounts of chemical research.

[2]  A. Alivisatos.  Semiconductor Clusters, Nanocrystals, and Quantum Dots , 1996, Science.

[3]  W. Webb,et al.  Two-Photon Fluorescence Excitation Cross Sections of Biomolecular Probes from 690 to 960 nm. , 1998, Applied optics.

[4]  C. Spangler.  Recent development in the design of organic materials for optical power limiting , 1999 .

[5]  Philippe Guyot-Sionnest,et al.  Photoluminescence of single semiconductor nanocrystallites by two-photon excitation microscopy , 1994 .

[6]  W. Webb,et al.  Measurement of two-photon excitation cross sections of molecular fluorophores with data from 690 to 1050 nm , 1996 .

[7]  Paras N. Prasad,et al.  ERRATUM: Nonlinear multiphoton processes in organic and polymeric materials , 1996 .

[8]  Xiaogang Peng,et al.  Experimental Determination of the Extinction Coefficient of CdTe, CdSe, and CdS Nanocrystals , 2003 .

[9]  Maria Goeppert-Mayer.  Über Elementarakte mit zwei Quantensprüngen , 1931 .

[10]  Moungi G. Bawendi,et al.  On the Absorption Cross Section of CdSe Nanocrystal Quantum Dots , 2002 .

[11]  J. Lakowicz,et al.  Two-photon induced fluorescence of Cy5-DNA in buffer solution and on silver island films. , 2005, Biochemical and biophysical research communications.

[12]  Hines,et al.  Size-dependent two-photon excitation spectroscopy of CdSe nanocrystals. , 1996, Physical review. B, Condensed matter.

[13]  Xiaogang Peng,et al.  Alternative Routes toward High Quality CdSe Nanocrystals , 2001 .

[14]  W. Fann,et al.  Experimental and theoretical investigations of absorption and emission spectra of the light-emitting polymer MEH-PPV in solution , 2000 .

[15]  Xiaogang Peng,et al.  Formation of high-quality CdS and other II-VI semiconductor nanocrystals in noncoordinating solvents: tunable reactivity of monomers. , 2002, Angewandte Chemie.

[16]  W. Webb,et al.  Water-Soluble Quantum Dots for Multiphoton Fluorescence Imaging in Vivo , 2003, Science.

[17]  P. Chou,et al.  One-pot synthesis and characterization of high-quality CdSe/ZnX (X=S, Se) nanocrystals via the CdO precursor , 2004 .

[18]  Alf Mews,et al.  Supramolecular Complexes from CdSe Nanocrystals and Organic Fluorophors , 2001 .

[19]  A. Alivisatos,et al.  Molecular Weight, Osmotic Second Virial Coefficient, and Extinction Coefficient of Colloidal CdSe Nanocrystals , 2002 .

[20]  Xiaogang Peng,et al.  Control of photoluminescence properties of CdSe nanocrystals in growth. , 2002, Journal of the American Chemical Society.

[21]  W. Denk,et al.  Two-photon laser scanning fluorescence microscopy. , 1990, Science.

[22]  P. Prasad,et al.  Two-Photon Properties and Excitation Dynamics of Poly(p-phenylenevinylene) Derivatives Carrying Phenylanthracene and Branched Alkoxy Pendents† , 2002 .

[23]  Yaochun Shen.  Principles of nonlinear optics , 1984 .

[24]  Xiaogang Peng,et al.  Formation of high-quality CdTe, CdSe, and CdS nanocrystals using CdO as precursor. , 2001, Journal of the American Chemical Society.

[25]  C. César,et al.  Two-photon absorption in CdTe quantum dots. , 2005, Optics express.