Regensburg 2007 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Poster 1

HL 13.80: Poster

Monday, March 26, 2007, 15:00–17:30, Poster A

Injection studies on the guest-host system: terrylene in para-terphenyl — •Bernhard Grotz, Fedor Jelezko, Jörg Wrachtrup, and Jens Pflaum — 3. Physikalisches Institut, Universität Stuttgart, Germany

Efficient charge carrier injection accompanied by recombination on individual lattice sites are the substantial requirements to detect single molecule electroluminescence in organic host-guest systems, the latter defining key elements for quantum cryptographic application. But comparing the positions of the contributing energy levels as well as the properties of metal-organic interfaces the injection often is restricted by the substantial level-offset and by the formation of interface dipoles, etc.

We address this problem by injection studies on the terrylene doped para-terphenyl guest-host system, a prominent candidate for single photon sources [1] and widely studied by optical techniques. The crystalline samples were prepared either by Lipsett-growth or by spin casting on glass. In a first attempt, direct electron injection in PPX capped and uncapped Lipsett-grown crystals was provided at energies between 10-1000eV in UHV. From spectral measurements of the luminescence we conclude the possibility of electron injection and subsequent transport to and recombination on the terrylene dopant in the para-terphenyl matrix. We will discuss further extensions to this approach, to achieve higher recombination efficiencies as well as higher local resolutions.
B. Lounis, W.E. Moerner, Nature, 407, 491 (2000)