CdSe/CdS-quantum rods: Fluorescent probes for in vivo two-photon laser scanning microscopy

Jelena Dimitrijevic, Lisa Krapf, Christopher Wolter, Christian Schmidtke, Jan Philip Merkl, Tobias Jochum, Andreas Kornowski, Anna Schüth, Andreas Gebert, Gereon Hüttmann, Tobias Vossmeyer*, Horst Weller

*Corresponding author for this work
31 Citations (Scopus)


CdSe/CdS-Quantum-dots-quantum-rods (QDQRs) with an aspect ratio of ∼6 are prepared via the seeded growth method, encapsulated within a shell of crosslinked poly(isoprene)-block-poly(ethylene glycol) (PI-b-PEG) diblock copolymer, and transferred from the organic phase into aqueous media. Their photoluminescence quantum yield (PLQY) of 78% is not compromised by the phase transfer. Within a period of two months the PLQY of QDQRs in aqueous solution at neutral pH decreases only slightly (to ∼65%). The two-photon (TP) action cross sections of QDQRs (∼105 GM) are two orders of magnitude higher than those of CdSe/CdS/ZnS-core/shell/shell quantum dots (QDs, ∼103 GM) with comparable diameter (∼5 nm). After applying PI-b-PEG encapsulated QDQRs onto the small intestinal mucosa of mice in vivo, their strong red fluorescence can easily be observed by two-photon laser scanning microscopy (TPLSM) and clearly distinguished from autofluorescent background. Our results demonstrate that PI-b-PEG encapsulated CdSe/CdS-QDQRs are excellent probes for studying the uptake and fate of nanoparticles by two-photon imaging techniques in vivo.

Original languageEnglish
Issue number17
Pages (from-to)10413-10422
Number of pages10
Publication statusPublished - 07.09.2014

Research Areas and Centers

  • Academic Focus: Biomedical Engineering


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