Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 52: Organic semiconductors II
HL 52.3: Vortrag
Freitag, 27. März 2009, 10:45–11:00, POT 51
Electroluminescence from Single Molecules — •Maximilian Nothaft1, Aurélien Nicolet1, Fedor Jelezko1, Jens Pflaum2, and Jörg Wrachtrup1 — 13. Phys. Inst., Univ. Stuttgart, D-70550 Stuttgart — 2Exp. Phys. VI, Univ. Wuerzburg and ZAE Bayern, D-97074 Wuerzburg
Doping of organic host matrices by guest molecules is widely applied in organic light emitting devices to improve their efficiency. Especially in single molecule spectroscopy the individual guest molecules serve as a tool to investigate single quantum emitters for possible application in quantum cryptography.
In our contribution we discuss light emission properties of individual Dibenzoterrylene (DBT) dye molecules inserted into an Anthracene (AC) host crystal at relative concentrations in the order of 10−8 mol/mol driven by optical and electronic stimulation.
It will be shown that this system offers key requirements to observe electrically excited single molecules at room temperature such as the possibility to obtain balanced current densities of up to 100mA/cm2 and single photon emission from the dye (DBT) using laser excitation of 710nm.
The electroluminescence signal was investigated using confocal microscopy and will be compared to images obtained using laser excitation. The detected light was spectrally resolved showing distinct emission peaks of the host and the dye. To quantify the respective emission behavior, photon correlation measurements under optical as well as electrical excitation will be presented.