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.
Pu
Shih-Chieh
SC
Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
Yang
Meng-Ju
MJ
Hsu
Cheng-Chih
CC
Lai
Chih-Wei
CW
Hsieh
Cheng-Chih
CC
Lin
Sheng Hsien
SH
Cheng
Yi-Ming
YM
Chou
Pi-Tai
PT
D000042:Absorption; D019187:Cadmium Compounds / Q000737:chemistry*; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry; D008856:Microscopy, Fluorescence; D015233:Models, Statistical; D036103:Nanotechnology / Q000379:methods*; D010777:Photochemistry; D017785:Photons; D045663:Quantum Dots; D018036:Selenium Compounds / Q000737:chemistry*; D013691:Tellurium / Q000737:chemistry*
D019187:Cadmium Compounds; D018036:Selenium Compounds; C058667:cadmium selenide; D013691:Tellurium; C028337:cadmium telluride