@article{WeissenseelGottschollBoennighausenetal.2021,
  author    = {Weissenseel, Sebastian and Gottscholl, Andreas and B{\"o}nnighausen, Rebecca and Dyakonov, Vladimir and Sperlich, Andreas},
  title     = {Long-lived spin-polarized intermolecular exciplex states in thermally activated delayed fluorescence-based organic light-emitting diodes},
  series = {Science Advances},
  volume    = {7},
  journal   = {Science Advances},
  number    = {47},
  doi       = {10.1126/sciadv.abj9961},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-265508},
  year      = {2021},
  abstract  = {Spin-spin interactions in organic light-emitting diodes (OLEDs) based on thermally activated delayed fluorescence (TADF) are pivotal because radiative recombination is largely determined by triplet-to-singlet conversion, also called reverse intersystem crossing (RISC). To explore the underlying process, we apply a spin-resonance spectral hole-burning technique to probe electroluminescence. We find that the triplet exciplex states in OLEDs are highly spin-polarized and show that these states can be decoupled from the heterogeneous nuclear environment as a source of spin dephasing and can even be coherently manipulated on a spin-spin relaxation time scale T-2* of 30 ns. Crucially, we obtain the characteristic triplet exciplex spin-lattice relaxation time T-1 in the range of 50 mu s, which far exceeds the RISC time. We conclude that slow spin relaxation rather than RISC is an efficiency-limiting step for intermolecular donor:acceptor systems. Finding TADF emitters with faster spin relaxation will benefit this type of TADF OLEDs.},
  language  = {en}
}
@article{GoerlZhangStepanenkoetal.2015,
  author    = {G{\"o}rl, Daniel and Zhang, Xin and Stepanenko, Vladimir and W{\"u}rthner, Frank},
  title     = {Supramolecular block copolymers by kinetically controlled co-self-assembly of planar and core-twisted perylene bisimides},
  series = {Nature Communications},
  volume    = {6},
  journal   = {Nature Communications},
  number    = {7009},
  doi       = {10.1038/ncomms8009},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-148657},
  year      = {2015},
  abstract  = {New synthetic methodologies for the formation of block copolymers have revolutionized polymer science within the last two decades. However, the formation of supramolecular block copolymers composed of alternating sequences of larger block segments has not been realized yet. Here we show by transmission electron microscopy (TEM), 2D NMR and optical spectroscopy that two different perylene bisimide dyes bearing either a flat (A) or a twisted (B) core self-assemble in water into supramolecular block copolymers with an alternating sequence of (A\(_{m}\)BB)\(_{n}\). The highly defined ultralong nanowire structure of these supramolecular copolymers is entirely different from those formed upon self-assembly of the individual counterparts, that is, stiff nanorods (A) and irregular nanoworms (B), respectively. Our studies further reveal that the as-formed supramolecular block copolymer constitutes a kinetic self-assembly product that transforms into thermodynamically more stable self-sorted homopolymers upon heating.},
  language  = {en}
}
@article{LeeLimSchneideretal.2015,
  author    = {Lee, Chang-Min and Lim, Hee-Jin and Schneider, Christian and Maier, Sebastian and H{\"o}fling, Sven and Kamp, Martin and Lee, Yong-Hee},
  title     = {Efficient single photon source based on \(\mu\)-fibre-coupled tunable microcavity},
  series = {Scientific Reports},
  volume    = {5},
  journal   = {Scientific Reports},
  number    = {14309},
  doi       = {10.1038/srep14309},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-145835},
  year      = {2015},
  abstract  = {Efficient and fast on-demand single photon sources have been sought after as critical components of quantum information science. We report an efficient and tunable single photon source based on an InAs quantum dot (QD) embedded in a photonic crystal cavity coupled with a highly curved \(\mu\)-fibre. Exploiting evanescent coupling between the \(\mu\)-fibre and the cavity, a high collection efficiency of 23\% and Purcell-enhanced spontaneous emissions are observed. In our scheme, the spectral position of a resonance can be tuned by as much as 1.5 nm by adjusting the contact position of the \(\mu\)-fibre, which increases the spectral coupling probability between the QD and the cavity mode. Taking advantage of the high photon count rate and the tunability, the collection efficiencies and the decay rates are systematically investigated as a function of the QD-cavity detuning.},
  language  = {en}
}
@article{YuNatarajanHorikirietal.2015,
  author    = {Yu, Leo and Natarajan, Chandra M. and Horikiri, Tomoyuki and Langrock, Carsten and Pelc, Jason S. and Tanner, Michael G. and Abe, Eisuke and Maier, Sebastian and Schneider, Christian and H{\"o}fling, Sven and Kamp, Martin and Hadfield, Robert H. and Fejer, Martin M. and Yamamoto, Yoshihisa},
  title     = {Two-photon interference at telecom wavelengths for time-bin-encoded single photons from quantum-dot spin qubits},
  series = {Nature Communications},
  volume    = {6},
  journal   = {Nature Communications},
  doi       = {10.1038/ncomms9955},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-138677},
  pages     = {8955},
  year      = {2015},
  abstract  = {Practical quantum communication between remote quantum memories rely on single photons at telecom wavelengths. Although spin-photon entanglement has been demonstrated in atomic and solid-state qubit systems, the produced single photons at short wavelengths and with polarization encoding are not suitable for long-distance communication, because they suffer from high propagation loss and depolarization in optical fibres. Establishing entanglement between remote quantum nodes would further require the photons generated from separate nodes to be indistinguishable. Here, we report the observation of correlations between a quantum-dot spin and a telecom single photon across a 2-km fibre channel based on time-bin encoding and background-free frequency downconversion. The downconverted photon at telecom wavelengths exhibits two-photon interference with another photon from an independent source, achieving a mean wavepacket overlap of greater than 0.89 despite their original wavelength mismatch (900 and 911 nm). The quantum-networking operations that we demonstrate will enable practical communication between solid-state spin qubits across long distances.},
  language  = {en}
}