Berlin 2012 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 85: Organic Semiconductors: Transistors and OLEDS

HL 85.8: Talk

Thursday, March 29, 2012, 17:00–17:15, EW 203

Single Molecule Electroluminescence — •Maximilian Nothaft¹, Steffen Höhla², Fedor Jelezko³, Jens Pflaum⁴, and Jörg Wrachtrup¹ — ¹3. Phys. Ins., Univ. Stuttgart, 70550 Stuttgart — ²Institut für Großflächige Mikroelektronik, Univ. Stuttgart, 70550 Stuttgart — ³Institut für Quantenoptik, Univ. Ulm, 89081 Ulm — ⁴Exp. Phys. VI, Univ. Wuerzburg und ZAE Bayern, 97074 Wuerzburg

In this study we present the feasibility of detecting single electrically driven molecules at room temperature. Thereby, phosphorescent iridium based dye molecules were employed as dopants in organic light emitting diodes (OLEDs). To be sensitive on electroluminescent emission from single isolated guest molecules we chose concentrations sufficiently low to render distances between next-neighboring molecules larger than the optical diffraction limit. By spectrally separating host-guest emission, optical properties and photon emission statistics of single electrically driven phosphorescent molecules could be analyzed. Besides proving that spectral properties of the dopant molecules are identical in optical and electrical excitation mechanisms, sub-poissonian non-classical photon statistics can be observed in the electroluminescence light of a single phosphorescent dye molecule at room temperature. This approach thereby shows a possible strategy towards electrically driven single photon sources at room temperature based on phosphorescent emitters.