Abstract
The paper presents the results of photoluminescence (PL) and Raman scattering studies ofnon-conjugated and bio-conjugated CdSe/ZnS core–shell quantum dots (QDs). Thecommercial CdSe/ZnS QDs used are characterized by color emission with maxima at605–610 nm (2.03–2.05 eV). PL spectra of non-conjugated QDs are the superposition of PLbands related to exciton emission in the CdSe core (2.03–2.05 eV) and to hot electron–holeemission via defect states at the CdSe/ZnS interface (2.37 and 2.68 eV). QD conjugationwas performed with biomolecules—the antihuman interleukin 10 antibody (antihumanIL10). The PL spectra of bio-conjugated QDs have been changed dramatically:only one PL band related to exciton emission in the CdSe core was detected inbio-conjugated QDs. To explain this effect a model has been proposed whichassumes that the QD bio-conjugation process is accompanied by the recharging ofacceptor-like interface states at the CdSe/ZnS interface. A comparative analysis ofnormalized PL spectra of non-conjugated CdSe/ZnS QDs with different intensities ofinterface state PL has confirmed the proposed electron–hole recombination model inQDs.
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