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Communication

Observation of Non-Förster-Type Energy-Transfer Behavior in Quantum Dot−Phthalocyanine Conjugates

Supporting Info

Smita Dayal, Yongbing Lou, Anna Cristina S. Samia, Jeffrey C. Berlin, Malcolm E. Kenney,* and Clemens Burda*;

Center for Chemical Dynamics and Nanomaterials Research, Department of Chemistry, Case Western Reserve University, Cleveland, Ohio 44106

J. Am. Chem. Soc., 2006, 128 (43), pp 13974–13975

DOI: 10.1021/ja063415e

Publication Date (Web): October 11, 2006

In papers with more than one author, the asterisk indicates the name of the author to whom inquiries about the paper should be addressed.

Abstract

The effect of linker chain length on the energy transfer from CdSe quantum dots (QDs) to silicon phthalocyanine (Pc) photodynamic therapy agents was investigated by steady-state and femtosecond time-resolved spectroscopy with 500 nm light for the specific excitation of the QD energy donor. The conjugation between the QD and the Pc was achieved with linker chains varying from 4 to 9 bond lengths by incorporating 1−6 methylene groups into the axial ligand of the Pc. With increasing chain length, the energy-transfer efficiency increased, which appears to be opposed to a purely Förster-type resonance energy-transfer behavior that is commonly discussed for the energy transfer in QD conjugates. The obtained results provide strong evidence for a capping-layer-mediated energy transfer in the QD-based donor−acceptor conjugates.

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