Regensburg 2004 – scientific programme
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HL: Halbleiterphysik
HL 12: Poster I
HL 12.36: Poster
Monday, March 8, 2004, 16:30–19:00, Poster A
Controlling spontaneous emission from colloidal II-VI nanocrystals in microcavities — •Robert Kraus1, Dmitry Talapin2, Andrey L. Rogach1, John M. Lupton1, Jochen Feldmann1, and Horst Weller2 — 1Lehrstuhl für Photonik und Optoelektronik, Ludwig-Maximilians-Universität München — 2Institut für Physikalische Chemie, Universität Hamburg
Colloidal II-VI nanocrystals are an interesting class of materials for optoelectronic devices. The solution-based synthesis of these nanoparticles typically results in a certain degree of polydispersity, which in turn gives rise to substantial spectral broadening of the ensemble. We demonstrate here that we are able to deposit composite nanocrystal/polymer films of excellent optical quality, which can be used as the active layer in microcavities. These provide well-defined optical resonances, to which only a spectrally narrow ensemble of the nanocrystals couple, thereby resulting in an enhancement in spontaneous emission. We present data on time resolved fluorescence from these emitters embedded in microcavities and discuss the possibility of using the cavity induced field-enhancement to control energy transfer processes.