Energy transfer in hybrid organic/inorganic nanocomposites

Thilo Stöferle; Rainer F. Mahrt

doi:10.1117/12.825256

1 September 2009 Energy transfer in hybrid organic/inorganic nanocomposites

Thilo Stöferle, Rainer F. Mahrt

Proceedings Volume 7393, Nanophotonic Materials VI; 73930C (2009) https://doi.org/10.1117/12.825256
Event: SPIE NanoScience + Engineering, 2009, San Diego, California, United States

Abstract

Chemically synthesized colloidal quantum dots can easily be incorporated into conjugated polymer host systems allowing for novel organic/inorganic hybrid materials combining the natural advantages from both organic as well as inorganic components into one system. In order to obtain tailored optoelectronic properties a profound knowledge of the fundamental electronic energy transfer processes between the inorganic and organic parts is necessary. Previous studies have attributed the observed efficient energy transfer to a dipole-dipole coupling with Foerster-radii of about 50-70Å. Here, we report on resonant energy transfer of non-equilibrium excitons in an amorphous polyfluorene donor CdSe/ZnS core-shell nanocrystal acceptor system. By time-resolved photoluminescence (PL) spectroscopy we have investigated the PL decay behavior of the primarily excited polyfluorene as a function of temperature. We show that the transfer efficiency drops from about 30% at room temperature to around 5% at low temperature. These results shed light on the importance of temperature-activated exciton diffusion in the energy transfer process. As a consequence the exciton has to migrate very close to the surface of the quantum dot in order to accomplish the coupling. Hence, the coupling strength is much weaker than anticipated in previous work and requires treatment beyond Förster theory.

Citation Download Citation

Thilo Stöferle and Rainer F. Mahrt "Energy transfer in hybrid organic/inorganic nanocomposites", Proc. SPIE 7393, Nanophotonic Materials VI, 73930C (1 September 2009); https://doi.org/10.1117/12.825256

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available