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Authors: B. De Geyter, Z. Hens
Title: The absorption coefficient of PbSe/CdSe core/shell colloidal quantum dots
Format: International Journal
Publication date: 10/2010
Journal/Conference/Book: Applied Physics Letters
Editor/Publisher: American Institute of Physics, 
Volume(Issue): 97 p.161908
DOI: 10.1063/1.3499754
Citations: 48 ( - last update: 3/12/2023)
16 (OpenCitations - last update: 3/5/2023)
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PbSe/CdSe core/shell colloidal quantum dots (QDs) are used as a model system to study the absorption coefficient of colloidal QD heterostructures, consisting of at least two semiconductor materials. We show that at energies far above the band gap (3.1 and 3.5 eV) the experimental intrinsic absorption coefficient is in excellent agreement with the Maxwell–Garnett effective medium theory for core/shell heterostructures and bulk values for the dielectric function. This allows for a straightforward measurement of the QD concentration from the absorbance spectrum. It also implies that basic optical measurements on core/shell heterostructures, such as measurements of the oscillator strength and photoluminescence lifetime, can be corrected for the local field reduction in QD heterostructures.

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